The present invention relates to a method for treating a phenyl isocyanate byproduct and a use thereof. The method comprises the following steps: S1: subjecting a phenyl isocyanate byproduct to first separation treatment, and obtaining a diphenylmethane series diisocyanate and polyisocyanate mixture and a phenyl isocyanate mixture; S2: subjecting the phenyl isocyanate mixture to second separation treatment, and obtaining a phenyl isocyanate concentrate and a solvent; and S3: reacting the phenyl isocyanate concentrate with hydrochloric acid in a reactor, and obtaining aniline hydrochloride. In the method for treating a phenyl isocyanate byproduct according to one embodiment of the present invention, byproducts containing phenyl isocyanate produced in an MDI production process can be efficiently treated, separated phenyl isocyanate can be converted, by means of reaction, into aniline hydrochloride, and the aniline hydrochloride is reused in the MDI production process, which not only reduces the impact of phenyl isocyanate on said production process but also saves production costs.
C07C 209/62 - Preparation of compounds containing amino groups bound to a carbon skeleton by cleaving carbon-to-nitrogen, sulfur-to-nitrogen, or phosphorus-to-nitrogen bonds, e.g. hydrolysis of amides, N-dealkylation of amines or quaternary ammonium compounds
C07C 263/10 - Preparation of derivatives of isocyanic acid by reaction of amines with carbonyl halides, e.g. with phosgene
Disclosed in the present invention are a light colored polyisocyanate having stable activity, a preparation method therefor, and a use thereof. The polyisocyanate contains 0-5 wt% of 2,2-MDI, 0.1-20 wt% of 2,4-MDI, 5-75 wt% of 4,4-MDI, 10-50 wt% of a tricyclic mixture polyphenyl polymethylene polyisocyanate, 5-30 wt% of a tetracyclic mixture polyphenyl polymethylene polyisocyanate, 5-50 wt% of a pentacyclic or above mixture polyphenyl polymethylene polyisocyanate, and heat sensitive chlorine of 1000-3000 ppm, and L*≥70. The polyisocyanate has the advantages of having stable activity and light color.
A multi-layer composite pipeline material and a preparation method therefor. The pipeline material comprises the following layers: I. an outer layer made of a polyamide composition (A), wherein the polyamide composition (A) at least comprises a semi-crystalline polyamide (A1); II. an inner layer made of a polyolefin composition (B), wherein the polyolefin composition (B) at least comprises a copolymer polyethylene (B1); and III. a modified polyolefin material (C) which serves as a bonding layer, is an olefin polymer modified by a polar group and is used for bonding the outer layer I and the inner layer II. The multi-layer composite pipeline material has excellent high temperature resistance and long-term service performance, relatively good strength and low-temperature toughness, and good resistance to media, and can be processed into pipelines of different shapes, broadening the application range of pipelines.
B32B 27/08 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance of synthetic resin of a different kind
B32B 27/18 - Layered products essentially comprising synthetic resin characterised by the use of special additives
B32B 27/20 - Layered products essentially comprising synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
B32B 27/22 - Layered products essentially comprising synthetic resin characterised by the use of special additives using plasticisers
B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
B29C 48/21 - Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
C08L 77/06 - Polyamides derived from polyamines and polycarboxylic acids
C08L 77/02 - Polyamides derived from omega-amino carboxylic acids or from lactams thereof
The present invention relates to a production process for crude isocyanate having a low single-benzene-ring impurity content. The production process comprises the following steps: 1) by means of taking an inert organic matter having a low boiling point as a stripping agent, stripping crude isocyanate in a stripping column to remove single-benzene-ring impurity components, so as to obtain a crude isocyanate product having a low single-benzene-ring impurity content; and 2) by means of rectification, separating the single-benzene-ring impurity component/stripping agent and crude isocyanate which are extracted from the top of the stripping column, recycling high-purity crude isocyanate at the bottom of a column, directly introducing stripping agent steam formed at the top of the column into the bottom of the stripping column for stripping, and treating the concentrated single-benzene-ring impurities discharged from the middle of the column as waste liquid. The production process effectively reduces the difficulty of separating single-benzene-ring impurity components from crude isocyanate, realizing simple recovery of high-purity crude isocyanate, and greatly reducing the loss amount of the crude isocyanate.
The present invention provides an isocyanurate-containing polyisocyanate composition with stable chromaticity, and a preparation method thereof, belonging to the technical field of polyisocyanate composition preparation. The preparation method comprises: an isocyanate monomer being polymerized in the presence of a catalyst, after the reaction is terminated, obtaining a prepolymer, subjecting the prepolymer to separation treatment and heat treatment, and obtaining the polyisocyanate composition containing isocyanurate; based on the weight of the polyisocyanate composition, the cleavable amine content of the polyisocyanate composition is less than or equal to 20 ppm. By means of controlling the cleavable amine content of the polyisocyanate composition, the present invention causes the resulting isocyanurate-containing polyisocyanate composition to have stable storage chromaticity, and the present invention has a chrominance increase of ≤10 Hazen when stored at 40° C. for 12 months.
C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
C08G 18/18 - Catalysts containing secondary or tertiary amines or salts thereof
C08G 18/09 - Processes comprising oligomerisation of isocyanates or isothiocyanates involving reaction of a part of the isocyanate or isothiocyanate groups with each other in the reaction mixture
C08G 18/10 - Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
6.
POLYISOCYANATE COMPOSITION, PREPARATION METHOD THEREFOR AND APPLICATION THEREOF
A polyisocyanate composition, a preparation method therefor and an application thereof. The value of the mass content of alkaline hydrolyzed chlorine minus the mass content of water hydrolyzed chlorine in the polyisocyanate composition is 0.1 ppm-100 ppm. The mass content of the alkaline hydrolyzed chlorine is the mass content obtained by calculating halogen dissociated under alkaline conditions and/or halogen dissociated under a temperature condition of 100° C. or more as the relative atomic mass of a chlorine atom. In the polyisocyanate composition containing a specific amount of alkaline hydrolyzed chlorine, when a reaction locally becomes out of control causing causes a local severe exotherm, chlorine in alkaline hydrolyzed chlorine will be dissociated and be toxic to catalysts, thereby reducing the reactivity in local overreactive areas to thereby avoid the turbidity of a polyurethane synthetic emulsion, such that the light transmittance and yellowing resistance of polyurethane products are further improved.
The present invention belongs to the technical field of preparing isocyanate derivatives, and particularly relates to a storage-stable polyisocyanate composition and a preparation method therefor. The method comprises: in the presence of a catalyst system, subjecting an isocyanate monomer to a polymerization reaction; terminating the reaction after a suitable conversion rate is reached, so as to obtain a polyisocyanate reaction solution; and then performing heat treatment on the obtained polyisocyanate reaction solution to obtain a heat-treated polyisocyanate mixture, wherein the heat treatment temperature is 10-30° C. higher than the heat-sensitive temperature of the obtained polyisocyanate product, and the heat treatment time is 5-30 min; and then performing separation treatment on the heat-treated polyisocyanate mixture. When the polyisocyanate composition of the present invention is stored at 50° C. for 30 days, the viscosity increase is small, thus the stability of the viscosity is ensured, and at the same time, the stability of the free monomer content and the color stability are also significantly improved.
Disclosed in the present application are a method and system for calibrating the mechanical properties of a material to be tested, and a storage medium, which are used for improving the accuracy of a mechanical property analysis result for a material to be tested. The method comprises: establishing a material card for calibrating the mechanical properties of a material to be tested (S11); according to the material card, establishing a simulation model corresponding to said material (S12); performing benchmarking according to simulation results of the simulation model under different operating conditions and experimental results of said material under corresponding operating conditions (S13); and when the benchmarking result represents that the degrees of fitting between the simulation results and the experimental results under the corresponding operating conditions all reach a preset degree of fitting, determining that the establishment of the material card is completed and the calibration of the mechanical properties of said material is completed (S14). By using the solution provided by the present application, the accuracy of a mechanical property analysis result of a material to be tested is improved.
The present application discloses a preparation method for light-colored vitamin A, comprising: reacting pentadecane phosphonate or pentadecane phosphonium salt with 2-methyl-4-acetoxy-2-butenal and alkali to generate vitamin A, wherein the content of 2-methyl-4-acetoxybutyraldehyde in the 2-methyl-4-acetoxy-2-butenal is not more than 1 wt%. The vitamin A obtained by the preparation method of the present application is light in color and high in yield, and an additional decolorization process does not need to be added.
C07C 67/343 - Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by isomerisationPreparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by change of size of the carbon skeleton by increase in the number of carbon atoms
C07C 69/145 - Acetic acid esters of monohydroxylic compounds of unsaturated alcohols
10.
Storage-stable polyisocyanate composition and preparation method
The present application provides a storage-stable polyisocyanate composition and a preparation method. The polyisocyanate composition is obtained by selecting one or more diisocyanate from aliphatic diisocyanates and alicyclic diisocyanates, and reacting same with an alcohol compound; the polyisocyanate composition contains an isocyanurate group, a uretdione group, a carbamate group, and an allophanate group; within the polyisocyanate composition, the molar ratio of the carbamate group/(uretdione group+isocyanurate group) is 0.01-0.2, and preferably 0.01-0.1. Compared to existing techniques, the present application has the advantage of a noticeable increase in system viscosity of uretdione polyisocyanate during storage. With the present application, by means of controlling the ratio of the carbamate group/(uretdione group+isocyanurate group) within the system, the increase in viscosity of a product during storage is inhibited, thereby improving the storage stability of the product.
C08G 18/28 - Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
Disclosed herein are a polyisocyanate composition, a preparation method therefor and an application thereof. The pH of an aqueous phase extraction liquid obtained after the polyisocyanate composition is subjected to an isocyanate-based endcapping derivation reaction ranges from 6.5 to 7.5. In the present application, by controlling the pH of the aqueous phase extraction liquid, the long-term storage stability of polyisocyanate can be effectively improved, and the viscosity growth rate after storage for 15 months at 30°C is less than 10%. Moreover, the polyisocyanate composition provided by the present application has a simple preparation process, has broad spectrum, and is easy to industrialize.
Aqueous dispersion comprising polyurethane or polyurethane-urea, a preparation method therefor and a use thereof. The polyurethane or polyurethane-urea is prepared by reacting raw materials comprising the following components: a compound having a tertiary amine group and at least one NCO reactive functional group, a polyester polyol having a number average molecular weight of 400 to 5000 and a functionality of 2 to 3, an organic compound having at least two isocyanate groups, a hydrophilic compound having one or more of an ionic group, a potential ionic group and a non-ionic group and having 2 to 3 NCO reactive functional groups, and a mono-functional non-ionic hydrophilic compound having at least one NCO reactive functional group. The aqueous dispersion can be stably stored for a prolonged period of time, and an adhesive prepared from the aqueous dispersion has an improved hydrolysis resistance while maintaining good bonding strength and heat resistance.
The apparatus includes one or more cylindrical housings connected to one another, a jacket on an outer side of a housing, an inner cylinder disposed at least in an interior of a first cylindrical housing, a heat insulation gasket, inner members, a corrosive high temperature gas inlet disposed on the heat insulation gasket, a gas and liquid phase outlet disposed at a bottom of the housing or a bottom of a last housing and a coolant inlet and outlet connected to an interior of the jacket. The heat insulation gasket seals the first cylindrical housing and a top of the inner cylinder in the interior of the first cylindrical housing. The inner members are distributed along a wall of the housing, communicate an interior of the jacket with an interior of the housing, and distribute a liquid in the interior of the jacket to the interior of the housing.
The present invention relates to the technical field of chlorine-alkali treatment, and in particular, to a catalytic dechlorination process for brackish water at an outlet of an electrolytic cell. The catalytic dechlorination process comprises: (a) mixing brackish water at an outlet of an electrolytic cell with an alkali solution; (b) introducing alkaline brackish water from bottom to top into a 1 # reactor for primary catalytic decomposition to generate a gas-state material flow I and a liquid-state material flow I, a catalyst bed layer of the 1 # reactor being provided with a 1 # catalyst; (c) the liquid-state material flow I flowing out from the upper portion of the 1 # reactor and entering a 2 # reactor from bottom to top for secondary catalytic decomposition to generate a gas-state material flow II and a liquid-state material flow II, a catalyst bed layer of the 2 # reactor being provided with a 2 # catalyst; and (d) the liquid-state material flow II reacting with a sodium sulfite solution, the 1 # catalyst and the 2 # catalyst being each independently selected from a supported nickel/copper bimetallic catalyst. According to the process of the present invention, effective chlorine having different concentrations can be thoroughly and effectively decomposed, and moreover, it is ensured that the content of metal impurity ions in the treated leachate is very low.
Catalyst for preparing phosgene and preparation method therefor, and method for preparation of phosgene and comprehensive utilization of energy thereof
Provided in the invention are a catalyst for preparing phosgene and a preparation method therefor, and a method for the preparation of phosgene and the comprehensive utilization of energy thereof. The preparation method comprises the following steps: 1) stirring and soaking activated carbon in a modifying solution, then adding dimethyltin dichloride and chromium oxide powders and carrying out a reaction, and then adding a nickel oxide fine powder and ultrasonically oscillating same to prepare a pre-modified activated carbon; 2) drying the pre-modified activated carbon; and 3) heating and calcinating the dried pre-modified activated carbon from step 2) to prepare the catalyst.
Preparation method for a polyurethane optical resin and applications thereof. The preparation method for the polyurethane optical resin comprises: a raw material composition comprising isocyanate and a polythiol compound undergoes a polymerization to produce the polyurethane optical resin. The turbidity value of the isocyanate used in the raw material composition is controlled at ≤2 NTU. The polyurethane optical resin produced is applicable in manufacturing optical products.
C08G 18/24 - Catalysts containing metal compounds of tin
C08G 18/38 - Low-molecular-weight compounds having hetero atoms other than oxygen
C08G 18/75 - Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
C08G 18/76 - Polyisocyanates or polyisothiocyanates cyclic aromatic
C08K 5/521 - Esters of phosphoric acids, e.g. of H3PO4
G02B 1/04 - Optical elements characterised by the material of which they are madeOptical coatings for optical elements made of organic materials, e.g. plastics
17.
METHOD FOR PREPARING POLYISOCYANATE AND REACTION DEVICE THEREFOR
Provided are a method for preparing a polyisocyanate, a polyisocyanate obtained by using the method, and a reaction device used in the method. The method comprises the following steps: 1) subjecting a polyamine solution and a phosgene solution to a cold reaction of a phosgenation reaction; and 2) further subjecting the material from step 1) to a hot reaction, wherein the amount of monofunctional impurities produced in step 1) is controlled such that the content of the monofunctional impurities in the final product is 0.1 ppm to 20000 ppm, and the amount of polyfunctional impurities produced in step 2) is controlled such that the content of the polyfunctional impurities in the final product is 0.1 ppm to 1000 ppm. In the present invention, by respectively controlling the contents of monofunctional impurities and polyfunctional impurities in the cold reaction stage and the hot reaction stage, respectively, a precise control of the solvent consumption amount can be achieved, thereby greatly reducing the energy consumption.
B01J 19/24 - Stationary reactors without moving elements inside
B01J 8/06 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with stationary particles, e.g. in fixed beds in tube reactorsChemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with stationary particles, e.g. in fixed beds the solid particles being arranged in tubes
B01J 8/10 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with moving particles moved by stirrers or by rotary drums or rotary receptacles
18.
ASYMMETRIC SILICONE OIL, PREPARATION METHOD THEREFOR, AND APPLICATION THEREOF
Asymmetric silicone oil, a preparation method therefor and an application thereof. The asymmetric silicone oil is used as a surface treatment agent for a filler, and is used for organosilicon thermal conductive materials, which can increase the compatibility between the filler and organosilicon. The dispersion of the filler can be improved when a high content of filler is added. The preparation method comprises the following steps: (1) in the presence of an organic solvent, contacting and reacting an organosiloxane monomer with a metal alkyl compound or a metal silicon alkoxide and a catalytic accelerator at 10-40°C for 1-24 hours; (2) adding an end-capping agent and carrying out an end-capping reaction at 10-30°C, the optimal reaction time being 0.5-5 hours, then washing with water, drying to remove water and desolventizing to then prepare a silicon-hydrogen-terminated or silicon-vinyl-terminated intermediate; and (3) carrying out a hydrosilylation reaction of the intermediate and alkoxysilane or alkoxysilicone oil to prepare the asymmetric silicone oil.
C08G 77/50 - Macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms by carbon linkages
C09K 5/14 - Solid materials, e.g. powdery or granular
C08L 83/07 - Polysiloxanes containing silicon bound to unsaturated aliphatic groups
C08L 83/05 - Polysiloxanes containing silicon bound to hydrogen
C08L 83/14 - Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon onlyCompositions of derivatives of such polymers in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
A polyisocyanate composition, a preparation method therefor and an application thereof. The value of the mass content of alkaline hydrolyzed chlorine minus the mass content of water hydrolyzed chlorine in the polyisocyanate composition is 0.1 ppm-100 ppm. The mass content of the alkaline hydrolyzed chlorine is the mass content obtained by calculating halogen dissociated under alkaline conditions and/or halogen dissociated under a temperature condition of 100°C or more as the relative atomic mass of a chlorine atom. In the polyisocyanate composition containing a specific amount of alkaline hydrolyzed chlorine, when a reaction locally becomes out of control causing causes a local severe exotherm, chlorine in alkaline hydrolyzed chlorine will be dissociated and be toxic to catalysts, thereby reducing the reactivity in local overreactive areas to thereby avoid the turbidity of a polyurethane synthetic emulsion, such that the light transmittance and yellowing resistance of polyurethane products are further improved.
The present invention relates to the technical field of impurity separation in a phosgenation reaction process, and specifically relates to a cyclic solvent in phosgenation reaction production and an impurity removal method therefor. The impurity removal method comprises: (1) rectifying a crude solvent; (2) extracting a gas-phase material flow I from a tower top, and performing gas-liquid separation after condensation, the obtained liquid-phase material flow II flowing back to the tower top, and the obtained gas-phase material flow II entering a tail gas treatment system; (3) dividing the liquid phase material flow I extracted by a tower into a liquid-phase material flow III to return to the tower and a liquid-phase material flow IV to be sent to a solvent reaction kettle; and (4) adding an amine compound to the solvent reaction kettle to react with the liquid-phase material flow IV, the obtained material being subjected to solid-liquid separation, and the liquid product being directly reused as a cyclic solvent. The impurity removal method of the present invention can ensure that the total amount of amine consumption substances in a cyclic solvent is reasonably controlled, reduce the generation of a solid by-product in a phosgenation reaction, and relieve the blockage of raw materials in transportation and storage, thereby prolonging the stable running time of a device, and improving product quality.
The present invention provides a method for treating discharged saline water generated during the preparation of MDA. Before catalytic oxidation treatment, the content of phenol is controlled to be not more than 0.8 mg/L and/or the content of sodium bromide is controlled to be not more than 0.2 mg/L. According to the treatment method provided by the present invention, the impurity components of discharged saline water are deeply analyzed, the content of phenol and the content of sodium bromide in the discharged saline water are effectively controlled to achieve the effect of deep purification; the content of TOC and the content of bromophenol in the treated discharged saline water are relatively low, and organic matters are thoroughly removed, reducing environmental pressure; and the treatment method provided by the present invention is highly pertinent, simple in process, convenient to implement industrially and stable in operation, does not require a lot of manpower and device investment, and has a very promising application prospect.
C02F 103/36 - Nature of the water, waste water, sewage or sludge to be treated from the chemical industry not provided for in groups from the manufacture of organic compounds
22.
METHOD FOR CONTROLLING TOC IN EFFLUENT BRINE IN DAM PRODUCTION PROCESS
Provided is a method for controlling TOC in effluent brine in a DAM production process, the method comprising the following steps: (1) subjecting formaldehyde and aniline to a condensation reaction and a transposition rearrangement reaction in the presence of an acidic catalyst, to obtain a mixture containing a diphenylmethane-based diamine salt and polyamine salt; (2) adding an alkali solution to the mixture for a neutralization reaction, followed by layering, to obtain a brine phase I and an organic phase I containing the diphenylmethane-based diamine and polyamine; and (3) subjecting the brine phase I to extraction and stripping treatments, to obtain an effluent brine, wherein the organic phase I is subjected to purification and refining treatments, to obtain the diphenylmethane-based diamine and polyamine, wherein, in step (1), the molar ratio of formaldehyde to aniline is 0.3-0.6, and the total content of impurities in the formaldehyde is less than 1000 ppm and in step (2), the excess base ratio in the neutralization reaction is 1.01-1.30. By means of the method of the present invention, the TOC content in effluent brine is reduced to 15 ppm, which meets the requirements of subsequent treatments.
C07C 211/50 - Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton having amino groups bound to only one six-membered aromatic ring having at least two amino groups bound to the carbon skeleton with at least two amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton
C07C 209/78 - Preparation of compounds containing amino groups bound to a carbon skeleton from amines, by reactions not involving amino groups, e.g. reduction of unsaturated amines, aromatisation, or substitution of the carbon skeleton from carbonyl compounds, e.g. from formaldehyde, and amines having amino groups bound to carbon atoms of six-membered aromatic rings, with formation of methylene-diarylamines
The present invention belongs to the technical field of preparing isocyanate derivatives, and particularly relates to a storage-stable polyisocyanate composition and a preparation method therefor. The method comprises: in the presence of a catalyst system, subjecting an isocyanate monomer to a polymerization reaction; terminating the reaction after a suitable conversion rate is reached, so as to obtain a polyisocyanate reaction solution; and then performing heat treatment on the obtained polyisocyanate reaction solution to obtain a heat-treated polyisocyanate mixture, wherein the heat treatment temperature is 10-30 °C higher than the heat-sensitive temperature of the obtained polyisocyanate product, and the heat treatment time is 5-30 min; and then performing separation treatment on the heat-treated polyisocyanate mixture. When the polyisocyanate composition of the present invention is stored at 50 °C for 30 days, the viscosity increase is small, thus the stability of the viscosity is ensured, and at the same time, the stability of the free monomer content and the color number stability are also significantly improved.
The present invention provides an isocyanurate-containing polyisocyanate composition with stable chromaticity, and a preparation method thereof, belonging to the technical field of polyisocyanate composition preparation. The preparation method comprises: an isocyanate monomer being polymerized in the presence of a catalyst, after the reaction is terminated, obtaining a prepolymer, subjecting the prepolymer to separation treatment and heat treatment, and obtaining the polyisocyanate composition containing isocyanurate; based on the weight of the polyisocyanate composition, the cleavable amine content of the polyisocyanate composition is less than or equal to 20 ppm. By means of controlling the cleavable amine content of the polyisocyanate composition, the present invention causes the resulting isocyanurate-containing polyisocyanate composition to have stable storage chromaticity, and the present invention has a chrominance increase of ≤ 10 Hazen when stored at 40°C for 12 months.
The present invention provides a method for preparing MDI and a method for preparing phosgene. The method for preparing MDI provided by the present invention comprises: in the presence of a solvent, subjecting a phosgene feedstock and MDA to a phosgenation reaction in a phosgenation reactor to generate reaction products comprising the MDI and hydrogen chloride, and discharging the hydrogen chloride from the phosgenation reactor as a discharged gaseous phase to control the mass content of high-boiling point chlorinated hydrocarbon impurities contained in the phosgene feedstock for the phosgenation reaction to be less than 1,000 ppm, the high-boiling point chlorinated hydrocarbon impurities being saturated and/or unsaturated chlorinated hydrocarbons with two carbon atoms. The method for preparing MDI provided by the present invention has improved process stability.
Disclosed by the present invention is a method for preparing a reactive sealant resin, the method comprising: (1) under the action of an alkali catalyst, polymerizing a hydroxyl-containing initiator with an epoxy compound to obtain a polyether polyol; (2) adding an alkoxide reagent and a halogenated end-capping agent containing a double bond to the polyether polyol obtained in step (1) for reaction, so as to obtain a crude double-bonded polyether product, and refining the crude product to obtain a modified polyether product; and (3) subjecting the modified polyether and hydrogen-containing silane to silane end-capping reaction under the action of a hydrosilylation catalyst, so as to obtain the target product, i.e., a reactive sealant resin. The resin has excellent properties as well as good adhesion and paintability.
C08G 65/26 - Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
A preparation method for an emulsifier, an emulsifier, an aqueous epoxy resin dispersion, and a formulation method. The preparation method for an emulsifier comprises reacting aminosulfonic acid and/or a sulfamate as a first reaction raw material with an epoxy resin in the presence of water, so as to obtain an ionic active emulsifier. The ionic active emulsifier molecule comprises at least one epoxy group from an epoxy resin and at least one sulfonic acid or sulfonate group from the first reaction raw material. The aqueous epoxy resin dispersion prepared by using the emulsifier has the characteristics of good stability and good corrosion resistance after curing, and can be used in the fields of coatings, adhesives, etc.
C09K 23/52 - Natural or synthetic resins or their salts
C08G 59/14 - Polycondensates modified by chemical after-treatment
C08G 59/20 - Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups characterised by the epoxy compounds used
C08L 63/00 - Compositions of epoxy resinsCompositions of derivatives of epoxy resins
C09K 23/00 - Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
28.
Ionic aqueous epoxy curing agent, preparation method therefor and use thereof
An ionic aqueous epoxy curing agent, a preparation method therefor and the use thereof. The aqueous epoxy curing agent is prepared by reacting the following raw materials in parts by weight: a) 1 part of a polyepoxy compound, b) 1.3-6 parts of a multifunctional compound, c) 0.2 to 1.25 parts of a monoepoxy compound, and d) 0.01 to 0.23 parts of a sultone, wherein the multifunctional compound has four or more active hydrogens. The curing agent obtained has a good hydrophilic effect and very good thinning performance, the paint film prepared by mixing same with an epoxy dispersion has the following advantages: excellent salt spray resistance and water resistance, strong adhesion, high hardness, etc.; in addition, the preparation process of the curing agent is simple, the conditions are mild, and room temperature curing is carried out.
C08G 59/40 - Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups characterised by the curing agents used
A method for preparing an isocyanate in a gaseous phase by feeding, in the presence or absence of an inert gas, an amine-containing gas stream and a phosgene-containing gas stream into a reaction region, allowing the amine and the phosgene to contact in gaseous forms and undergo a phosgenation reaction in the reaction region, thus preparing the target isocyanate in a gaseous form in the reaction region. The phosgene-containing stream is subjected to preheating and warming before being fed into the reaction region, and the phosgene-containing stream comprises a substance A at a mass fraction of <1% before being subjected to the preheating and warming up. Substance A is a NCO group-containing substance and/or an olefinic double bond-containing substance. The method reduces the formation of clogging matter in a heat exchanger and a vessel during the preheating and warming of the phosgene and during the reaction process.
Disclosed by the present invention are an aqueous polyurethane functional mask substrate and an application thereof. Two kinds of water-based polyurethane dispersions are used as the main components of the mask substrate. The transdermal penetration and absorption of functional ingredients such as whitening, moisturizing and anti-aging ingredients in facial mask products are promoted by means of the special cross-linked structures of polyurethane films. During use, a mask is evenly applied to the face; and after the mask dries, the entire mask may be removed directly or removed after being moistened using water. The mask substrate according to the present invention is also applicable to body masks such as a hand mask, a neck mask and a back mask.
An isocyanate prepolymer used for polyurethane-fiber composite materials, a preparation method therefor and a use thereof. The isocyanate prepolymer is prepared by using the following raw material components: an aliphatic polyisocyanate; a polyether polyol having a molecular weight of 200-1000 daltons and an average functionality of 2.5-6; and an alicyclic diisocyanate. The aliphatic polyisocyanate component is prepolymerized by introducing the polyether polyol having a specific structure, and a specific content of the alicyclic diisocyanate is introduced for blending modification so that the prepared isocyanate prepolymer has the characteristics of low viscosity and good mechanical properties and is particularly suitable for preparing polyurethane-fiber composite materials.
The present application provides a storage-stable polyisocyanate composition and a preparation method. The polyisocyanate composition is obtained by selecting one or more diisocyanate from aliphatic diisocyanates and alicyclic diisocyanates, and reacting same with an alcohol compound; the polyisocyanate composition contains an isocyanurate group, a uretdione group, a carbamate group, and an allophanate group; within the polyisocyanate composition, the molar ratio of the carbamate group/(uretdione group+isocyanurate group) is 0.01-0.2, and preferably 0.01-0.1. Compared to existing techniques, the present application has the advantage of a noticeable increase in system viscosity of uretdione polyisocyanate during storage. With the present application, by means of controlling the ratio of the carbamate group/(uretdione group+isocyanurate group) within the system, the increase in viscosity of a product during storage is inhibited, thereby improving the storage stability of the product.
C08G 18/75 - Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
C08G 18/12 - Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
A superhydrophobic membrane and a preparation method therefor, and a method for concentrating and recycling MDI waste brine. The method for concentrating and recycling MDI waste brine comprises: 1) performing two-phase separation on MDI waste brine to produce an organic phase and a brine phase; 2) sequentially subjecting the brine phase to aniline extraction, reboil distillation, and TOC removal processes; and 3) washing the organic phase to obtain washing wastewater; enabling the washing wastewater to contact an extractant by means of the superhydrophobic membrane for membrane extraction; and transporting the washing wastewater having experienced the membrane extraction to a biochemical unit and then enabling same to enter a reclaimed water recycling system.
Disclosed are a catalytic oxidation catalyst, a preparation method therefor, and a method for the deep treatment of organic matters in an MDI saline. The catalyst comprises a carrier and an active component, wherein the carrier is titanium dioxide, and the active component is an organic neutral ligand-metal complex type ionic liquid. The deep treatment method comprises: (1) adjusting the pH value of the MDI saline, and adding an oxidizing agent for treatment; and (2) bringing the MDI saline having been treated in step (1) into contact with the catalytic oxidation catalyst for a catalytic oxidation reaction to obtain a deeply treated saline. The catalyst can reduce or even avoid the loss of a metal from the catalyst while ensuring that the catalytic oxidation effect is improved. The deep treatment method is simple and readily practicable, has a high treatment efficiency, and does not produce secondary pollution.
Disclosed are an aqueous dispersion comprising polyurethane or polyurethane-urea, a preparation method therefor and a use thereof. The polyurethane or polyurethane-urea is prepared by reacting raw materials comprising the following components: (a) a compound having a tertiary amine group and at least one NCO reactive functional group, (b) a polyester polyol having a number average molecular weight of 400 to 5000 and a functionality of 2 to 3, (c) an organic compound having at least two isocyanate groups, (d) a hydrophilic compound having one or more of an ionic group, a potential ionic group and a non-ionic group and having 2 to 3 NCO reactive functional groups, and (e) a mono-functional non-ionic hydrophilic compound having at least one NCO reactive functional group. The aqueous dispersion can be stably stored for a prolonged period of time, and an adhesive prepared from the aqueous dispersion has an improved hydrolysis resistance while maintaining good bonding strength and heat resistance.
C08G 18/12 - Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
37.
APPARATUS AND METHOD FOR RAPID COOLING OF HIGH TEMPERATURE GAS
An apparatus and method for the rapid cooling of a high-temperature gas, the apparatus comprising one or more cylindrical housings (001) that are connected to one another, jackets (002) on outer sides of the housings, an inner cylinder (003) located inside of at least a first housing, a heat insulation gasket (005), internal members (006), a high temperature corrosive gas inlet (N01) provided on the heat insulation gasket (005), gas-liquid two-phase outlets (N02) located at the bottom portions of the housings or at the bottom portion of the last housing, and coolant inlets and outlets (N03-N05) connected to the insides of the jackets (002). The heat insulation gasket (005) seals the first cylindrical housing (001) and the top portion of the inner cylinder (003) within the first cylindrical housing (001), and the inner members (005) are distributed along the walls of the housings (001), place inner cavities of the jackets (002) in communication with the insides of the housings (001), and are used to distribute liquid within the jackets (002) into the housings (001). The described method replaces filters and coolers to effectively reduce the risk of cooling blockage by gases containing solids.
An isocyanate composition, and an optical resin prepared using same. In the isocyanate composition, the content of one or more of sodium, potassium, iron, chromium, manganese, and nickel elements, calculated based on isocyanate, is more than 1 ppm and less than or equal to 50 ppm, preferably more than 1 ppm and less than or equal to 20 ppm. The prepared optical resin has low optical deformation and a low white turbidity occurrence rate. The isocyanate composition further contains a certain amount of a complexing agent, so that isocyanate has excellent storage stability.
C08G 18/38 - Low-molecular-weight compounds having hetero atoms other than oxygen
G02B 1/04 - Optical elements characterised by the material of which they are madeOptical coatings for optical elements made of organic materials, e.g. plastics
39.
POLYISOCYANATE COMPOSITION AND PREPARATION METHOD THEREFOR
Disclosed are a polyisocyanate composition and a method for preparing the composition. The composition is formed by polymerizing an aliphatic diisocyanate monomer at least including hexamethylene diisocyanate, and contains an isocyanurate ester group, a ureadiketone group, an oxadiazine triketone group and an iminooxadiazine diketone group, wherein the molar ratio of the oxadiazine triketone group to the isocyanurate ester group is (0.001-0.01) : 1, and the sum of the content of bromine and the content of fluorine in the composition is not more than 80 ppm. The polyisocyanate composition can be stably stored at low temperatures.
The present invention belongs to the technical field of waterborne polyurethane resins, and in particular relates to a method for preparation of a polyisocyanate by a photochemical reaction and a method for preparing a waterborne polyurethane resin. The method for preparation of a waterborne polyurethane resin comprises the following steps: subjecting raw materials including polyisocyanate, an oligomer polyol, a chain extender and a hydrophilic agent to a polymerization reaction to obtain the waterborne polyurethane resin, wherein the content of benzophenone impurities in the polyisocyanate is ≤ 0.045 wt%. By controlling the content of benzophenone impurities during the preparation process of the polyisocyanate, the present invention can effectively improve the resistance to yellowing of a product, and also decreases the harm of unqualified downstream products due to the existence of such impurities in the product.
The present invention provides a phosgene synthesis and brine evaporation electrolysis integrated treatment process, comprising the following steps: 1) introducing premixed CO and chlorine to a primary phosgene synthesis tower to be synthesized into phosgene, the primary phosgene synthesis tower being provided with a heat transfer agent circulation space, and the heat transfer agent circulating in the heat transfer agent circulation space; 2) introducing the heat transfer agent, which absorbs reaction heat, in the heat transfer agent circulation space to a steam generator, exchanging heat with water to generate superheated steam, and returning the heat-exchanged heat transfer agent to the heat transfer agent circulation space for further absorbing the reaction heat generated by phosgene synthesis; 3) supplying the superheated steam to a brine evaporation concentration device, the brine evaporation concentration device performing evaporation concentration on brine by using the superheated steam as a heat source; and 4) electrolyzing the strong brine or dry salt obtained in step 3) to generate chlorine. The phosgene synthesis and brine evaporation electrolysis integrated treatment process can realize rational utilization of energy and resource utilization of effluent brine.
C02F 1/16 - Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
42.
CATALYST FOR PREPARING PHOSGENE AND PREPARATION METHOD THEREFOR, AND METHOD FOR PREPARATION OF PHOSGENE AND COMPREHENSIVE UTILIZATION OF ENERGY THEREOF
Provided in the invention are a catalyst for preparing phosgene and a preparation method therefor, and a method for the preparation of phosgene and the comprehensive utilization of energy thereof. The preparation method comprises the following steps: 1) stirring and soaking activated carbon in a modifying solution, then adding dimethyltin dichloride and chromium oxide powders and carrying out a reaction, and then adding a nickel oxide fine powder and ultrasonically oscillating same to prepare a pre-modified activated carbon; 2) drying the pre-modified activated carbon; and 3) heating and calcinating the dried pre-modified activated carbon from step 2) to prepare the catalyst. Based on the preparation method, thin layers are formed on the surface of the catalyst by bonding chromium tin phosphate and chromium tin silicate with Ni by means of -O-Ni-O-, respectively, which can improve the high-temperature resistance and oxidation resistance of the activated carbon, and improve the safe and stable operation level of a device. The aim of integrated comprehensive utilization of energy is achieved by coupling phosgene production with an evaporation and concentration process of brine and using steam as a heat source for evaporation and concentration of the brine.
Provided are a preparation method for a polyurethane optical resin and applications thereof. The preparation method for the polyurethane optical resin comprises: a raw material composition comprising isocyanate and a polythiol compound undergoes a polymerization to produce the polyurethane optical resin. The turbidity value of the isocyanate used in the raw material composition is controlled at ≤ 2 NTU. The polyurethane optical resin produced is applicable in manufacturing optical products.
C08G 18/38 - Low-molecular-weight compounds having hetero atoms other than oxygen
G02B 1/04 - Optical elements characterised by the material of which they are madeOptical coatings for optical elements made of organic materials, e.g. plastics
44.
POLYISOCYANATE COMPOSITION, PREPARATION METHOD THEREFOR AND USE THEREOF
Disclosed is a method for preparing a polyisocyanate composition, comprising the following steps: subjecting component A) to a self-polymerization reaction in the presence of component B), a solvent, and component C), a polymerization catalyst; and then terminating the reaction by adding a catalyst poison to obtain a polyisocyanate composition, wherein component A) includes a mixture of 2,4-toluene diisocyanate and 2,6-toluene diisocyanate, the content of dihalide imide in component A) is less than 30 ppm by weight, and the color number of the polyisocyanate composition is ≤ 40 Hazen. According to the method, the amount of the catalyst can be significantly reduced, and the resulting polyisocyanate composition has a lower color number, and has a better aging resistance when applied to paints.
The present invention belongs to the technical field of aqueous epoxy coatings, and especially relates to an ionic aqueous epoxy curing agent, a preparation method therefor and the use thereof. The aqueous epoxy curing agent is prepared by reacting the following raw materials in parts by weight: a) 1 part of a polyepoxy compound, b) 1.3-6 parts of a multifunctional compound, c) 0.2-1.25 parts of a monoepoxy compound, and d) 0.01-0.23 parts of a sultone, wherein the multifunctional compound has four or more active hydrogens. The curing agent obtained in the present invention not only has a good hydrophilic effect and very good thinning performance, the paint film prepared by mixing same with an epoxy dispersion has the following advantages: excellent salt spray resistance and water resistance, strong adhesion, high hardness, etc.; in addition, the preparation process of the curing agent is simple, the conditions are mild, and room temperature curing is carried out.
C08G 59/40 - Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups characterised by the curing agents used
46.
PLUG FLOW DISTILLATION TRAY AND METHOD FOR PREPARING ISOPHORON BY LIQUID-PHASE CONDENSATION OF ACETONE
The present invention provides a plug flow distillation tray and a method for preparing isophorone by liquid-phase condensation of acetone. The plug flow distillation tray provided by the present invention comprises a tray and a plug flow assembly provided on the tray, the plug flow assembly comprising a downcomer, a leveled overflow weir, a light-heavy phase flow dividing element, a liquid receiving tray I and a flow guide element; the downcomer is connected to the tray, and the leveled overflow weir is provided on an inlet of the downcomer; the light-heavy phase flow dividing element is provided in the downcomer and is located below the leveled overflow weir; the liquid receiving tray I is connected to the tray, and is located on a side opposite to the side where the downcomer is connected to the tray; the flow guide element is provided above the junction of the liquid receiving tray I and the tray, and the flow guide element is provided with a plurality of flow guide passages. A pressurized reactive distillation column comprising the plug flow distillation tray of the present invention can be used for performing post-treatment of an IP (isophorone)/alkali liquid system which is easy to foam, so that the liquid phase can be distributed and flow relatively evenly, thereby facilitating the improvement of the reaction effect.
C07C 49/603 - Unsaturated compounds containing a keto group being part of a ring of a six-membered ring, e.g. quinone methides
C07C 45/74 - Preparation of compounds having C=O groups bound only to carbon or hydrogen atomsPreparation of chelates of such compounds by reactions not involving the formation of C=O groups by isomerisationPreparation of compounds having C=O groups bound only to carbon or hydrogen atomsPreparation of chelates of such compounds by reactions not involving the formation of C=O groups by change of size of the carbon skeleton by increase in the number of carbon atoms by reaction of compounds containing C=O groups with the same or other compounds containing C=O groups combined with dehydration
C07C 45/82 - SeparationPurificationStabilisationUse of additives by change in the physical state, e.g. crystallisation by distillation
Disclosed is a method for preparing an isocyanate in a gaseous phase, comprising feeding, in the presence or absence of an inert gas, an amine-containing gas stream and a phosgene-containing gas stream into a reaction region, allowing the amine and the phosgene to contact in gaseous forms and undergo a phosgenation reaction in the reaction region, thus preparing the target isocyanate in a gaseous form in the reaction region. The phosgene-containing stream is subjected to preheating and warming before being fed into the reaction region, and the phosgene-containing stream comprises a substance A at a mass fraction of < 1% before being subjected to the preheating and warming up, the substance A being a NCO group-containing substance and/or an olefinic double bond-containing substance. The method of the present invention can reduce the formation of clogging matter in a heat exchanger and a vessel during the preheating and warming of the phosgene and during the reaction process. Accordingly, clogging can be effectively ameliorated, a longer run cycle can be achieved, the frequency of overhaul of the phosgene-containing system can be reduced, and the safety in apparatus operation can be enhanced.
SHANGHAI WANHUA KEJU CHEMICAL TECHNOLOGY DEVELOPMENT CO. LTD (China)
Inventor
Ju, Changxun
Liu, Bin
Wang, Yongming
Ye, Tian
Shi, Zhengyang
Li, Yuan
Hua, Weiqi
Abstract
Disclosed by the present invention is a method for preparing a reactive sealant resin, the method comprising: (1) under the action of an alkali catalyst, polymerizing a hydroxyl-containing initiator with an epoxy compound to obtain a polyether polyol; (2) adding an alkoxide reagent and a halogenated end-capping agent containing a double bond to the polyether polyol obtained in step (1) for reaction, so as to obtain a crude double-bonded polyether product, and refining the crude product to obtain a modified polyether product; and (3) subjecting the modified polyether and hydrogen-containing silane to silane end-capping reaction under the action of a hydrosilylation catalyst, so as to obtain the target product, i.e., a reactive sealant resin. The resin has excellent properties as well as good adhesion and paintability.
SHANGHAI WANHUA KEJU CHEMICAL TECHNOLOGY DEVELOPMENT CO. LTD (China)
Inventor
Ji, Xueshun
Li, Weifei
Qu, Rui
Deng, Junying
Wang, Xiao
Sun, Jiakuan
Abstract
A preparation method for an emulsifier, an emulsifier, an aqueous epoxy resin dispersion, and a formulation method. The preparation method for an emulsifier comprises reacting aminosulfonic acid and/or a sulfamate as a first reaction raw material with an epoxy resin in the presence of water, so as to obtain an ionic active emulsifier. The ionic active emulsifier molecule comprises at least one epoxy group from an epoxy resin and at least one sulfonic acid or sulfonate group from the first reaction raw material. The aqueous epoxy resin dispersion prepared by using the emulsifier has the characteristics of good stability and good corrosion resistance after curing, and can be used in the fields of coatings, adhesives, etc.
C08L 63/00 - Compositions of epoxy resinsCompositions of derivatives of epoxy resins
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08G 59/18 - Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
C09D 163/00 - Coating compositions based on epoxy resinsCoating compositions based on derivatives of epoxy resins
C09J 163/00 - Adhesives based on epoxy resinsAdhesives based on derivatives of epoxy resins
B01F 17/00 - Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
50.
ANTI-AGING PVC COMPOSITION, PREPARATION METHOD THEREFOR AND USE THEREOF
Disclosed is an anti-aging PVC composition, which contains a PVC resin, and, based on the weight percentage of the PVC resin, 10-80 wt% of a plasticizer, 1-10 wt% of an organic tin heat stabilizer and 0.1-5 wt% of an anti-aging auxiliary, wherein the anti-aging auxiliary is a compound of an oxamide auxiliary and an higher aliphatic ketone auxiliary. The anti-aging PVC composition of the present invention is suitable for preparing coating materials of video cables and audio cables. The anti-aging PVC composition of the present invention has excellent transparency and anti-aging properties, with △YI ≤ 1 under the conditions of 85ºC, 85% relative humidity, and 168 hours of aging.
SHANGHAI WANHUA KEJU CHEMICAL TECHNOLOGY DEVELOPMENT CO. LTD (China)
Inventor
Li, Jianfeng
Shang, Yonghua
Wu, Qian
Zhu, Fulin
Chen, Hao
Wang, Peng
Wang, Qiao
Hua, Weiqi
Li, Yuan
Abstract
Provided are a method for preparing a polyurethane optical resin and a use thereof. The preparation method comprises: subjecting a raw material composition containing isocyanate and a polymercaptan compound to a polymerization reaction so as to obtain a polyurethane optical resin, wherein the content of a dimer structure polymer of the isocyanate present in the isocyanate used in the raw material composition is controlled to be ≤ 4 wt%, preferably ≤ 3 wt%, further preferably ≤ 2.5wt%, and more preferably ≤ 1.6 wt%. The method for preparing a polyurethane optical resin provided in the present invention can successfully manufacture polyurethane optical resin, and can effectively reduce the rate at which optical deformation of an article occurs.
C08G 18/38 - Low-molecular-weight compounds having hetero atoms other than oxygen
G02B 1/04 - Optical elements characterised by the material of which they are madeOptical coatings for optical elements made of organic materials, e.g. plastics
Disclosed is a method for preparing polyisocyanate. A self-polymerization reaction of isocyanate is carried out using a fluorine-containing catalyst as a catalyst. After the reaction is completed, a fluorine-containing terminator is added to terminate the reaction and to obtain a reaction solution. The reaction solution of the terminated reaction is cooled to -30°C to 30°C and is subjected to an adsorption or filtration treatment using a fluorine-containing material. Unreacted isocyanate monomers are removed to obtain polyisocyanate. The fluorine content in the polyisocyanate is controlled to be no greater than 80 ppm. This method controls the fluorine content in the product and avoids turbidity when the product is stored at low temperature.
SHANGHAI WANHUA KEJU CHEMICAL TECHNOLOGY DEVELOPMENT CO. LTD (China)
Inventor
Ji, Xiaoxiao
Jia, Haidong
Xu, Nuo
Liu, Shan
Liu, Yunling
Zhang, Jie
Ji, Xueshun
Sun, Jiakuan
Abstract
Disclosed by the present invention are an aqueous polyurethane functional mask substrate and an application thereof. Two kinds of water-based polyurethane dispersions are used as the main components of the mask substrate. The transdermal penetration and absorption of functional ingredients such as whitening, moisturizing and anti-aging ingredients in facial mask products are promoted by means of the special cross-linked structures of polyurethane films. During use, a mask is evenly applied to the face; and after the mask dries, the entire mask may be removed directly or removed after being moistened using water. The mask substrate according to the present invention is also applicable to body masks such as a hand mask, a neck mask and a back mask.
SHANGHAI WANHUA KEJU CHEMICAL TECHNOLOGY DEVELOPMENT CO. LTD (China)
Inventor
Wang, Cuicui
Liu, Shan
Zhou, Tianwen
Zhou, Cao
Zhang, Jie
Wang, Haimei
Abstract
An aqueous polyurethane-polyvinyl acetate resin, a preparation method therefor and use thereof. Said resin is prepared by using raw materials including the following components: A) a diisocyanate end-capped prepolymer; B) a chain extender, including amine chain extenders and sulfonic acid hydrophilic chain extenders containing active hydrogen, the amine chain extenders including diamine chain extenders containing active hydrogen; C) an end-capping agent, the end-capping agent being a monoamine end-capping agent; D) vinyl acetate; E) a protective colloid; and F) a radical polymerization initiator. The resulting resin has excellent comprehensive properties (for example, the resin has high solid content and good construction performance, and the adhesive prepared therefrom has excellent heat resistance and high bonding strength), and the preparation process is easy to implement.
C09J 151/08 - Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bondsAdhesives based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
55.
SHAMPOO COMPOSITION CONTAINING AQUEOUS POLYURETHANE DISPERSION, AND USES OF DISPERSION
A shampoo composition containing an aqueous polyurethane dispersion. The shampoo composition comprises aqueous polyurethane, a dirt-removal surfactant, a conditioner, and a carrier. After hair is dried, the shampoo composition can increase the volume of the hair processed by the shampoo composition and can allow the hair to have full and fluffy effects.
2 and CO. The radial and axial temperature difference of the catalyst bed is lowered by using the alkali metal salt-modified activated carbon coating/foamed silicon carbide structural catalyst and by segmental filling, so that high temperature of tube wall is obtained in the case of a larger tube diameter, and high quality of steam is obtained stably.
The present invention relates to a method for preparing TDI (toluene diisocyanate) isocyanurate by using TDI, monohydric alcohol, solvent, antioxidant, catalyst and termination agent as the raw materials. The properties of the isocyanurate are improved by the process comprising the modification by monohydric alcohol and addition of the catalyst and solvent in several stages at an appropriate temperature. By adding the catalyst and solvent in batches at the condition of controlling both NCO % and the viscosity in the preparation process, and adjusting the solid content at each step, the resulting TDI isocyanurate has low content of free TDI, high xylene tolerance, small product color number, and high performance stability, which makes the product obtained by the isocyanurate have good application properties such as the drying, polishing and extinction properties of coating film, and such isocyanurate has good compatibility with other components.
C08G 18/79 - Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
C08G 18/02 - Polymeric products of isocyanates or isothiocyanates of isocyanates or isothiocyanates only
C08G 18/09 - Processes comprising oligomerisation of isocyanates or isothiocyanates involving reaction of a part of the isocyanate or isothiocyanate groups with each other in the reaction mixture
58.
Viscoelastic sound-absorbing polyurethane foam and preparation method thereof
The present invention discloses a viscoelastic sound-absorbing polyurethane foam and a method for preparing the same, the foam being prepared by reacting a polyisocyanate composition and an isocyanate reactive component. The isocyanate reactive component comprises, based on the weight of mixed polyethers, 30-80 wt % of (bii) a copolyol of epoxypropane-epoxyethane, or a conjugate thereof, wherein the content of oxy-ethylidene unit is 5-35 wt %; 2-20 wt % of (biii) a copolyol of epoxypropane-epoxyethane, or a conjugate thereof, wherein the content of oxy-ethylidene unit is 70-100 wt %; and 20-70 wt % of (biv) a copolyol of epoxypropane-epoxyethane, or a conjugate thereof, wherein the content of oxy-ethylidene unit is 0-20 wt %. The sound-absorbing foam of the present invention has a ball rebound rate of 15-30% and good sound absorption performance.
The present invention relates to a composite catalyst, preparation process thereof, and process for catalyzing the trimerization of butadiene using the composite catalyst. The composite catalyst comprises: (A) a titanium compound catalyst active component, (B) an organometallic compound co-catalyst component, (C) a sulfoxide compound catalyst-modifying component, (D) a monoester compound catalyst-modifying component, and (E) a solvent component. The composite catalyst has advantages of excellent selectivity, high catalytic activity, easy preparation and so on.
B01J 31/38 - Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups of titanium, zirconium or hafnium
B01J 31/02 - Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
B01J 31/12 - Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing organo-metallic compounds or metal hydrides
B01J 31/14 - Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing organo-metallic compounds or metal hydrides of aluminium or boron
The present invention relates to a method for preparing catalyst used for preparing chloride by oxidizing hydrogen chloride. The method is mixing a slurry mainly containing boron and chromium with a slurry mainly containing copper, boron, alkali-metal elements, rare-earth elements, aluminum sol, silica sol, carrier and optionally other metal elements, the mixing temperature being not more than 100℃, and the residence time being not more than 120 minutes, the mixed slurry is successively treated with spray drying, high temperature calcination and the like, so that catalyst particles is obtained. The present invention also relates to the catalyst prepared through the method, uses of the catalyst used in the process of preparing chloride by oxidizing hydrogen chloride and a method for preparing chlorine by using the catalyst. The catalyst is used for preparing chlorine by oxidizing hydrogen chloride with oxygen or air in fluidized bed reactor, and has an excellent activity and anti-caking property, a relatively good mechanical strength and a relatively long service life.
B01J 23/78 - Catalysts comprising metals or metal oxides or hydroxides, not provided for in group of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups with alkali- or alkaline earth metals or beryllium
B01J 23/83 - Catalysts comprising metals or metal oxides or hydroxides, not provided for in group of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups with rare earths or actinides
B01J 37/00 - Processes, in general, for preparing catalystsProcesses, in general, for activation of catalysts
C01B 7/04 - Preparation of chlorine from hydrogen chloride
61.
CATALYTIC WET OXIDATION REACTION TOWER, METHOD AND APPARATUS FOR TREATING HIGH CONCENTRATION ORGANIC WASTEWATER USING THE SAME
A method for treating high concentration organic wastewater by catalytic wet air oxidation is provided. High concentration organic wastewater is passed sequentially through a raw water storage tank (1), a high pressure pump (2), a filter (3), a high pressure buffer tank (4), and a heat exchanger (5), distributed by a high pressure liquid distributor (8) provided in the bottom of a reaction tower (7), contacted and reacted sufficiently with the high pressure air compressed by an air compressor (6) and distributed by a high pressure gas distributor (9) in the reaction tower (7), and then entered into a gas-liquid separation tank (10) for separation. The gas phase separated is discharged up to standard after being treated by an exhaust gas absorption tower (11), and the aqueous phase separated is discharged up to standard after being collected by a wastewater buffer tank (12). Also provided is an apparatus for treating high concentration organic wastewater by catalytic wet air oxidation. Applying the method can efficiently treat a variety of high concentration organic wastewater.
C02F 1/74 - Treatment of water, waste water, or sewage by oxidation with air
B01J 3/00 - Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matterApparatus therefor
B05B 1/06 - Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops in annular, tubular or hollow conical form
62.
PROCESS FOR PREPARING ISOCYANATE HOMOPOLYMERS CONTAINING URETDIONE GROUPS
The present invention relates to a process for preparing isocyanate homopolymers containing uretdione groups, in which the phosphinoboron compound of formula (I) are used as catalysts to catalyze the homopolymerization reaction of raw isocyanates, thereby obtaining a solution of isocyanate homopolymers having uretdione groups, then separating the solution and thus obtaining the isocyanate homopolymers containing uretdione groups. The isocyanate homopolymers containing uretdione groups prepared by this process have a high amount of the uretdione groups, wherein the dependence of the amount on the conversion rate of raw isocyanates is significantly ameliorated, with low chromaticities.
Provided are a polyisocyanate modified with sulphamic acid and a mixture thereof, the preparation method therefor, and the use thereof in the production of polyurethane, especially as a cross-linking ingredient in the field of aqueous coatings and binders containing isocyanate reactive groups.
The present invention relates to a catalyst used for resource utilization of a fixed bed aniline distillation residue and method for preparing said catalyst. Based on the catalyst total weight, the catalyst components and amounts are as follows: NiO is an active component and has a content of 5%-40%; one or more oxide of Fe, Mo, Cr, or Co is a first cocatalyst component and has a content of 2%-30%; one or more oxide of La, Zr, Y, or Ce is a second cocatalyst component and has a content of 10-30%; the remainder are vectors. The catalyst is prepared by using coprecipitation. The catalyst exhibits high activity and stability during the waste treatment process, and upon reaction for 200h, retains a relatively high distillation residue cracking rate.
B01J 23/83 - Catalysts comprising metals or metal oxides or hydroxides, not provided for in group of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups with rare earths or actinides
C07C 211/35 - Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of rings other than six-membered aromatic rings of a saturated carbon skeleton containing only non-condensed rings
C07C 209/72 - Preparation of compounds containing amino groups bound to a carbon skeleton from amines, by reactions not involving amino groups, e.g. reduction of unsaturated amines, aromatisation, or substitution of the carbon skeleton by reduction of unsaturated amines by reduction of six-membered aromatic rings
C07C 209/62 - Preparation of compounds containing amino groups bound to a carbon skeleton by cleaving carbon-to-nitrogen, sulfur-to-nitrogen, or phosphorus-to-nitrogen bonds, e.g. hydrolysis of amides, N-dealkylation of amines or quaternary ammonium compounds
65.
CATALYST FOR PREPARING PHOSGENE AND METHOD FOR PREPARING PHOSGENE USING THE SAME
The present invention relates to a catalyst for preparing phosgene and a method for preparing phosgene using the catalyst. Said method comprises: modifying the surface of an activated carbon coating/foamed silicon carbide structural catalyst using an alkali metal salt; filling the catalysts having different thickness of the activated carbon coating and different amount of the alkali metal salt in different sections in the axial direction of the multi-tubular reactor of the fixed bed, and preparing phosgene using Cl2 and CO. The radial and axial temperature difference of the catalyst bed is lowered by using the alkali metal salt-modified activated carbon coating/foamed silicon carbide structural catalyst and by segmental filling, so that high temperature of tube wall is obtained in the case of a larger tube diameter, and high quality of steam is obtained stably. The method can reduce the pulverization and spallation of the catalyst effectively, prolong the life time of the catalyst, obtain high quality of phosgene, prolong the safe and stable operation cycle of the apparatus, utilize the reaction heat of phosgene synthesis effectively, and reduce the operation and maintenance costs.
The present invention relates to a method for preparing polycarbonate with continuous two-phase interface phosgene method. Firstly, an aqueous solution of alkali metal hydroxide with triphenol and polyphenol dissolved therein reacts with a certain amount of phosgene in the present of inert organic solvent to prepare a prepolymer, and then a coupling reaction is performed among the prepolymer, an aqueous solution of alkali metal hydroxide with bisphenol and phosgene dissolved therein to finally obtain a polycarbonate resin. The method can avoid a cross-linking reaction, reduce the cost and improve the quality of the while improving the conversion ratio of the branching agent and the branching degree of the product.
A method for preparing diamino-dicyclohexyl methane (H12MDA) by catalytic hydrogenation of diamino-diphenyl methane (MDA). In the process, 4,4'-MDA is firstly used as starting material to prepare 4,4'-H12MDA by catalytic hydrogenation. When the activity of the catalyst decrease, the deactivated catalyst is activated online by switching the feed as the mixture of 2,4'-MDA and 4,4'-MDA.
C07C 211/36 - Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of rings other than six-membered aromatic rings of a saturated carbon skeleton containing at least two amino groups bound to the carbon skeleton
C07C 209/72 - Preparation of compounds containing amino groups bound to a carbon skeleton from amines, by reactions not involving amino groups, e.g. reduction of unsaturated amines, aromatisation, or substitution of the carbon skeleton by reduction of unsaturated amines by reduction of six-membered aromatic rings
The present invention relates to a method for preparing TDI isocyanurate. The raw materials used comprise: TDI, monohydric alcohol, solvent, antioxidant, catalyst and terminator. The performance of the isocyanurate is improved by the modification of monohydric alcohol and the process of adding catalyst and solvent in several stages at an appropriate temperature. During the preparation process, under the condition of simultaneously controlling NCO% and viscosity, the catalyst and the solvent are added in batches, and the solid content in each step is adjusted. The finally obtained TDI isocyanurate has low level of free TDI, high xylene tolerance degree, small color number and high performance stability, which makes the application performance of the product, such as drying property, polishing property, extinction property of paint film, and the isocyanurate have good compatibility with other components.
Disclosed in the present invention are a viscous-elastic sound-absorbing polyurethane foam and a method for preparing same, the foam being prepared by reacting a polyisocyanate composition and an isocyanate reactive component. The isocyanate reactive component comprises, based on the weight of a mixed polyether, 30-80 wt% of (bii) a copolyol of epoxypropane-epoxyethane or a conjugate thereof, with a content of oxy-ethidene units being 5-35 wt%; 2-20 wt% of (biii) a copolyol of epoxypropane-epoxyethane or a conjugate thereof, with a content of oxy-ethidene units being 70-100 wt%; 20-70 wt% of (biv) a copolyol of epoxypropane-epoxyethane or a conjugate thereof, with a content of oxy-ethidene units being 0-20 wt%. The sound-absorbing foam of the present invention has a ball resilience rate of 15-30%, and good sound-absorbing properties.
The present invention provides a method for preparing 3-aminomethyl-3,5,5-trimethyl cyclohexylamine. The method comprises: a) reacting 3-cyano-3,5,5-trimethyl cyclohexanone with excess primary amine, while removing the water produced by the reaction, so that IPN is substantially completely converted into an imine compound; b) in the presence of an aminolysis catalyst, mixing the product resulted from step a) with liquid ammonia so as to the imine compound is ammonolyzed to give 3-cyano-3,5,5-trimethyl cyclohexylimine and the primary amine; and c) performing a hydrogenation reaction to 3-cyano-3,5,5-trimethyl cyclohexylimine obtained in step b) to give 3-aminomethyl-3,5,5-trimethyl cyclohexylamine in the presence of hydrogen and a hydrogenation catalyst. The method of the present invention avoids the generation of 3,5,5-trimethyl cyclohexanol and 3-aminomethyl-3,5,5-trimethyl cyclohexanol as major byproducts in the prior art, thereby improving the yield of 3-aminomethyl-3,5,5-trimethyl cyclohexylamine.
C07C 211/35 - Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of rings other than six-membered aromatic rings of a saturated carbon skeleton containing only non-condensed rings
C07C 209/48 - Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of carboxylic acids or esters thereof in presence of ammonia or amines, or by reduction of nitriles, carboxylic acid amides, imines or imino-ethers by reduction of nitriles
C07C 209/52 - Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of carboxylic acids or esters thereof in presence of ammonia or amines, or by reduction of nitriles, carboxylic acid amides, imines or imino-ethers by reduction of imines or imino-ethers
Provided is a 3-aminomethyl-3,5,5-trimethylcyclohexylamine preparation method. A feeding flow of 3-cyano-3,5,5-trimethylcyclohexylamine is reacted with NH3 and hydrogen in the presence of a hydrogenation catalyst; the method is characterized by: firstly adding a basic compound to the feeding flow of 3-cyano-3,5,5-trimethylcyclohexylamine, and then after a portion of 3-cyano-3,5,5-trimethylcyclohexylamine has reacted, adding an acidic compound to reaction materials for further hydrogenation reaction to prepare the product. The method ensures that the aminonitrile content in the product is low, thus effectively reducing the duration of the reaction and greatly reducing the consumption of the catalyst during the hydrogenation reaction process.
C07C 209/48 - Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of carboxylic acids or esters thereof in presence of ammonia or amines, or by reduction of nitriles, carboxylic acid amides, imines or imino-ethers by reduction of nitriles
C07C 209/62 - Preparation of compounds containing amino groups bound to a carbon skeleton by cleaving carbon-to-nitrogen, sulfur-to-nitrogen, or phosphorus-to-nitrogen bonds, e.g. hydrolysis of amides, N-dealkylation of amines or quaternary ammonium compounds
C07C 211/36 - Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of rings other than six-membered aromatic rings of a saturated carbon skeleton containing at least two amino groups bound to the carbon skeleton
72.
COMPOSITE CATALYST, PREPARATION PROCESS THEREOF, AND PROCESS FOR CATALYZING THE TRIMERIZATION OF BUTADIENE USING THE COMPOSITE CATALYST
The present invention relates to a composite catalyst, preparation process thereof, and process for catalyzing the trimerization of butadiene using the composite catalyst. The composite catalyst comprises: (A) a titanium compound catalyst active component, (B) an organometallic compound co-catalyst component, (C) a sulfoxide compound catalyst-modifying component, (D) a monoester compound catalyst-modifying component, and (E) a solvent component. The composite catalyst has advantages of excellent selectivity, high catalytic activity, easy preparation and so on.
B01J 31/38 - Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups of titanium, zirconium or hafnium
C07C 13/277 - Monocyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with a twelve-membered ring the twelve-membered ring being unsaturated with a cyclododecatriene ring
A process of producing chlorine gas by catalytic oxidation of hydrogen chloride is disclosed, and said process is characterized in that it comprises: incorporating an oxidizing agent such as ozone, hydrogen peroxide solution etc. into a gas stream of hydrogen chloride containing impurities, conducting oxidation pretreatment of said gas stream under the action of ultrasonic wave, such that said impurities contained in said gas stream are oxidized; wherein the oxidizing agent does not generate additional or new impurities in the reaction system. The gas stream obtained after the oxidation pretreatment is allowed to pass through a separating device wherein the oxidized impurities in the form of liquid and/or the oxidized impurities in the form of solid are removed from said gas stream so as to obtain a purified gas stream of hydrogen chloride. Thereafter, the purified gas stream of hydrogen chloride is well mixed with a gas stream containing molecular oxygen, the resultant gas mixture is preheated to a reaction temperature, and then catalytically oxidized to produce chlorine gas. By means of oxidation pretreatment and separation, the process can remove efficiently the sulfur-containing impurities, the halogen-containing impurities, hydrocarbon impurities and the like from the gas stream of hydrogen chloride, and does not generate additional impurities. Meanwhile, the present invention has an advantage of simple and convenient operation.
Provided is a polycarbonate preparation method, comprising the following steps: a) mixing a phenoxide water solution of a bisphenol and/or a polyphenol with a phosgene and inert organic solvent, reacting, and generating a polycarbonate oligomer; b) highly emulsifying the oligomer by reinforced micro dispersion mixing to form a stable emulsion; and c) introducing the emulsion into a polycondensation reactor for a chain extending reaction, separating and finally obtaining the polycarbonate. Through the reinforced micro dispersion mixing, the present method can prepare the polycarbonate high polymer in the absence of a catalyst, thus simplifying the post-treatment process of the product and improving product quality.
12MDA, increases the yield of the reaction, and reduces the production cost. The present invention also provides a post treatment process of the reaction mixture.
The invention relates to a method of circular use of waste brine produced in the manufacture process of MDI, comprising the following steps: (1) the waste brine produced in the manufacture process of MDI is subjected to a high-gravity extraction and then to a column extraction, wherein said waste brine contains aniline, diaminodiphenylmethane and polyamine; (2) the waste brine from step (1) is transmitted to a stripping tower for steam stripping; (3) the waste brine from the stripping tower of step (2) and a chemical oxidant are transmitted to an oxidation reactor to which air is blown for aeration; (4) the waste brine after the treatment of step (3) is transmitted to an absorption tower for absorption. The invention makes the salt water have TOC of less than 8 ppm and TN of less than 2.5 ppm and achieves regeneration of resources in the waste brine such as sodium chloride and water and the like for circular use.
C02F 1/20 - Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
C02F 1/28 - Treatment of water, waste water, or sewage by sorption
C02F 1/38 - Treatment of water, waste water, or sewage by centrifugal separation
C02F 1/72 - Treatment of water, waste water, or sewage by oxidation
C02F 1/74 - Treatment of water, waste water, or sewage by oxidation with air
C02F 103/36 - Nature of the water, waste water, sewage or sludge to be treated from the chemical industry not provided for in groups from the manufacture of organic compounds
77.
Jet reactor with flow ducts and process for preparing isocyanates using it
The present invention provides a flow duct type jet reactor and a process for preparing isocyanates using it. The flow duct type jet reactor situates flow ducts in inner feed pipe which form whirlpool and reinforce vortex, thereby amine steam rapidly admixes and reacts with phosgene, and the byproducts are reduced. In addition, the present process uses a jet-absorption apparatus which rapidly cools the high temperature gas discharged from the reactor to a temperature at which the product is thermally stable, and at the same time provides negative pressure for the reaction process of the system, and thus saving bulky vacuum system.
B01J 19/24 - Stationary reactors without moving elements inside
B01J 19/26 - Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles
C07C 263/10 - Preparation of derivatives of isocyanic acid by reaction of amines with carbonyl halides, e.g. with phosgene
78.
Hole jet reactor and a process for the preparation of an isocyanate using the reactor
The present invention relates to a hole-jetting type reactor and its applications, in particular to a process for the production of isocyanates by the phosgenation of aliphatic or aromatic diamines or triamines in the gas phase using this reactor. The present invention achieves a good mixing and reacting result of the gas-phase phosgenation reaction at a high temperature by improving the mixing of reactants in the reactor to reduce the possibility of forming swirls and eliminate negative pressure produced at a local jet area, which can finally reduce back-mixing and formation of solid by-products.
The present invention provides a method of preparing polymethylene-polyphenyl-polyamine (briefly referred to as polyamine, DAM), in which a high gravity rotating bed is used as the mixing reactor of formaldehyde and aniline hydrochloride, the mixing solution of aniline hydrochloride and circulation solution and the formaldehyde are fed into the high gravity rotating bed reactor proportionally to carry out mixing and condensation reaction under a condition of a very high gravity; the materials leaving the high gravity rotating bed reactor is introduced into a stirred vessel to proceed with the pre-condensation reaction and obtain a condensation solution; and the process steps of heating, molecular rearrangement, neutralization, water washing and purification, etc. are completed to obtain the refined DAM. With the method according to the present invention, the main by-products is obviously reduced in the condensation process, the phenomenon of deposit attaching to the inner walls of circulation pipes and heat exchanger and blockage are prevented in the condensation process, the impurity content is low in the refined DAM, and the subsequent product MDI has a lighter color, the product quality is stable and may be improved to a certain extent.
A hole-jetting type mixer-reactor, comprises the following parts: a first feeding port, a second feeding port, an outer casing, an inner casing, jet holes and a mixing reaction zone. The inner casing is inside the outer casing, and the lower portion of the outer casing forms a buffer chamber with the inner casing. The first feeding port connects with the inner casing to constitute one flow channel, and the second feeding port connects with the buffer chamber to form the other flow channel. The jet holes are on the wall of the inner casing situated at lower portion of the buffer chamber. The mixing reaction zone is inside the inner casing below the jet holes. The cross section of the inner casing is rectangular or rectangle-like. The mixer-reactor can achieve a fast mixing of two reactant streams which reacts with instantaneous, complicated parallel or consecutive competing reactions. The time scale of the mixing process is several milliseconds.
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