The present invention relates to the field of organic matter drying, and provides a drying method and system for glycolide. The drying method comprises: (a) separating a glycolide solid-liquid mixture into a small-particle glycolide wet material and a large-particle glycolide wet material, wherein the particle size of glycolide in the small-particle glycolide wet material ranges from 0.1 to 60 μm, and the particle size of glycolide in the large-particle glycolide wet material ranges from 40 to 1000 μm; (b) feeding the small-particle glycolide wet material into a fluidized dryer, passing hot nitrogen into the fluidized dryer to dry the small-particle glycolide wet material, and the dried glycolide flowing out from the bottom of the fluidized dryer; and (c) feeding the large-particle glycolide wet material into a vacuum belt dryer comprising one or more stages of drying belts, and discharging the dried glycolide through a final-stage drying belt. The method of the present invention has a good drying effect and high product purity.
F26B 20/00 - Combinations of machines or apparatus covered by two or more of groups
F26B 3/08 - Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
F26B 5/04 - Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
2.
MATERIAL, PREPARATION METHOD THEREFOR, AND APPLICATION THEREOF
Disclosed in the present invention is a material containing at least two structural layers, and the degrees of crystallinity of adjacent structural layers are different; the structural layers are formed of a degradable resin.
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 33/00 - Layered products characterised by particular properties or particular surface features, e.g. particular surface coatingsLayered products designed for particular purposes not covered by another single class
3.
Novel Polyglycolic Acid and Preparation Method Thereof by Polycondensation
The invention relates a novel polyglycolic acid. The polyglycolic acid comprises branched repeating units and linear repeating units. The polyglycolic acid may be produced from methyl glycolate by polycondensation in the presence of structure regulators, and exhibit excellent melt strength and thermal stability while maintaining good flowability and suitability for use in melt blow molding.
C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids
Disclosed is a branched polymer resin comprising repeating units of —(—OCH2-CO—)— or —(—CO—CH2O—)—, which is produced by ring-opening polymerization in the presence of structure regulators and optionally end-capping agents. The branched polymer resin exhibits a lower melt viscosity and a higher heat-stable temperature and suitable for melt processing.
C08G 18/42 - Polycondensates having carboxylic or carbonic ester groups in the main chain
B29C 45/00 - Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mouldApparatus therefor
B29K 67/00 - Use of polyesters as moulding material
C07C 31/22 - Trihydroxylic alcohols, e.g. glycerol
C07C 31/24 - Tetrahydroxylic alcohols, e.g. pentaerythritol
C08G 18/73 - Polyisocyanates or polyisothiocyanates acyclic
C08G 18/79 - Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids
C08G 63/685 - Polyesters containing atoms other than carbon, hydrogen, and oxygen containing nitrogen
C08G 63/82 - Preparation processes characterised by the catalyst used
C08G 63/91 - Polymers modified by chemical after-treatment
5.
Polyglycolide copolymer composition and preparation thereof
A composition comprises a polyglycolide or a polyglycolide copolymer and a filler. The polyglycolide is prepared from glycolide by ring-opening polymerization. The composition may have a tensile modulus greater than 5,800 MPa. The polyglycolide copolymer may have a weight-average molecular weight (Mw) in the range of 10,000-1,000,000 and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) in the range of 1.0 to 10.0. The polyglycolide copolymer may have a melt index (MFR) in the range of 0.1 to 1000 g/10 min. Also provided is a process for preparing the composition.
The invention relates to an integrated process for producing a polyglycolic acid product, including polymerization, modification and molding. The resulting polyglycolic acid product may maintain the physical and chemical properties of polyglycolic acid to the greatest extent, including yellowness index (YI), weight-average molecular weight, strength and mean square radius of rotation. Also provided are the polyglycolic acid product and apparatus for carrying out the integrated process.
C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids
B29B 9/12 - Making granules characterised by structure or composition
B29B 9/06 - Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
B29B 9/10 - Making granules by moulding the material, i.e. treating it in the molten state
Provided is a process for producing a product having polyglycolic acid and glycolide from methyl glycolate. The process comprises esterification, polycondensation and optimization. Also provided are a product produced by the process and a method of changing the amount of the polyglycolic acid in the product by modifying the amount of an esterification catalyst and/or adjusting the reaction temperature.
C08G 63/82 - Preparation processes characterised by the catalyst used
C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids
The invention relates to a process of preparing a glycolide product from methyl polyglycolate or its product. The process comprises depolymerizing the methyl polyglycolate or its product in the presence of a depolymerization agent to make a depolymerized product; repolymerizing the depolymerized product to make a glycolic acid oligomer; and pyrolyzing the repolymerized mixture to make a glycolide product. A rare earth metal catalyst may be used facilitate the depolymerization reaction. The glycolide pyrolysis conversion rate may be greater than 90%. Also provided are related glycolide product and the glycolic acid oligomer. The glycolic acid oligomer may have a weight average molecular weight of 4,000-80,000.
C08J 11/24 - Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds containing hydroxyl groups
C08J 11/26 - Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds containing carboxylic acid groups, their anhydrides or esters
9.
PROCESS METHOD FOR PREPARING ACETIC ACID BY CARBONYLATING METHANOL BY MEANS OF REACTOR THERMALLY COUPLED WITH RECTIFYING TOWER
The present invention relates to a process method for preparing acetic acid by carbonylating methanol by means of a reactor thermally coupled with a rectifying tower. The process method comprises: introducing methanol and CO into the reactor for a carbonylation reaction, sending a reaction liquid at an outlet port of the reactor to a flash evaporator for flash evaporation in order to separate a liquid phase component and a gas phase component, and returning the liquid phase component to the reactor; allowing the gas phase component to enter a catalyst trap, returning the trapped catalyst to the bottom of the flash evaporator, and allowing the gas phase to enter a light component tower for separation in order to obtain a first overhead light component and a first tower kettle heavy component; and sending the first tower kettle heavy component into a heavy component tower for separation in order to obtain an acetic acid product, wherein the reaction liquid in the reactor and the tower kettle material in the heavy component tower undergo coupled heat transfer. Compared with the prior art, the present invention has the advantages of energy efficiency, reduced emissions, a high product purity, easy control of the system, stable operation, etc.
C07C 51/12 - Preparation of carboxylic acids or their salts, halides, or anhydrides by reaction with carbon monoxide on an oxygen-containing group in organic compounds, e.g. alcohols
C07C 51/42 - SeparationPurificationStabilisationUse of additives
C07C 51/44 - SeparationPurificationStabilisationUse of additives by change of the physical state, e.g. crystallisation by distillation
A rectification device for oxo synthesis of acetic acid, of which the interior is provided with a dividing plate (1) for diving-wall rectification of crude acetic acid in the oxo synthesis of acetic acid, the diving plate (1) being vertically provided between an overhead rectification section and a bottom stripping section, such that the spaces on both sides of the dividing plate (1) form a first rectification area (2) and a second rectification area (3), respectively; the bottom end and the top end of the first rectification area (2) is in communication with the bottom end and the top end of the second rectification area (3) to form a common rectification section (4) and a common stripping section (5); the first rectification area (2) is provided with a crude acetic acid feed port (21) and a methanol injection assembly (22); the second rectification area (3) is provided with a high-purity acetic acid discharge port (31) and a potassium hydroxide injection assembly (32); the top of the common rectification section (4) is provided with a condensation reflux assembly and an overhead discharge port (41); and the bottom of the common stripping section (5) is provided with a heater and a bottom heavy component liquid collection tank (51).
C07C 51/12 - Preparation of carboxylic acids or their salts, halides, or anhydrides by reaction with carbon monoxide on an oxygen-containing group in organic compounds, e.g. alcohols
C07C 51/44 - SeparationPurificationStabilisationUse of additives by change of the physical state, e.g. crystallisation by distillation
The present invention relates to a method for synthesizing acetic acid by low-pressure methanol carbonylation. The method comprises: (1) in the presence of a catalyst, introducing methanol and CO into a non-stir reactor to undergo a carbonylation reaction, and then feeding a liquid phase portion in a middle part of the non-stir reactor into a flash evaporator to undergo flash evaporation, thereby separating and obtaining a liquid phase component and a gas phase component; (2) performing heat exchange on the liquid phase component with a mother liquid flash evaporation heat exchanger, and once heated, performing secondary flash evaporation, thereby separating and obtaining a secondary liquid phase component and a secondary gas phase component; (3) feeding the separated and obtained primary gas phase and secondary gas phase components into a catalyst trap, returning the trapped and recovered catalyst back into the flash evaporator, and allowing the gas phase components to enter into a light component fractionating column to undergo fractionation, thereby obtaining light components and heavy components; (4) feeding the liquid phase components from steps (1) and (2) back into the non-stir reactor to undergo reaction; (5) feeding the heavy components from step (3) into a heavy component fractionating column to undergo fractionation, thereby obtaining an acetic acid product. The present invention utilizes self-produced reaction heat to perform advanced separation of a reaction liquid, reduces ineffective circulation, and lowers electricity consumption and steam consumption.
C07C 51/12 - Preparation of carboxylic acids or their salts, halides, or anhydrides by reaction with carbon monoxide on an oxygen-containing group in organic compounds, e.g. alcohols
A syngas to ethylene glycol distillation separation system and a separation process, the system comprising a gas-liquid separation tank (6), a first alcohol removal tower (1), a second alcohol removal tower (2), an ethanol removal tower (3), a butanediol removal tower (4) and a refining tower (5) connected in sequence to a pipeline, the ethanol removal tower (3), the butanediol removal tower (4) and the refining tower (5) each being provided with a thin film evaporator (11).
The present invention relates to a nitric acid reduction conversion process, the process involving bringing a raw material gas that is rich in nitric oxide into contact with a raw material liquid containing nitric acid and methanol in a nitric acid reduction reactor, such that an oxidation-reduction reaction occurs in order to convert the nitric acid into methyl nitrite. Compared with the prior art, the present invention improves the nitric acid conversion rate, reduces the pressure drop and also increases the selectivity of the target product methyl nitrite by optimizing the number of reactors in series, the reaction temperature, the feed ratio of the nitric oxide in the raw material gas to the nitric acid in the raw material liquid, and the amount of supplemented methanol.
Disclosed is a branched polymer resin comprising repeating units of - (-OCH2-CO-) -or - (-CO-CH2O-) -, which is produced by ring-opening polymerization in the presence of structure regulators and optionally end-capping agents. The branched polymer resin exhibits a lower melt viscosity and a higher heat-stable temperature and suitable for melt processing.
The invention relates a novel polyglycolic acid. The polyglycolic acid comprises branched repeating units and linear repeating units. The polyglycolic acid may be produced from methyl glycolate by polycondensation in the presence of structure regulators, and exhibit excellent melt strength and thermal stability while maintaining good flowability and suitability for use in melt blow molding.
C07D 319/12 - 1,4-DioxanesHydrogenated 1,4-dioxanes not condensed with other rings
C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids
Disclosed is a copolymer of polyglycolide and one or more additives. The copolymer may have a weight-average molecular weight(Mw) in the range of 10,000-1,000,000 and a ratio of a weight-average molecular weight to a number-average molecular weight(Mw/Mn) in the range of 1.0 to 10.0. The copolymer may have a melt index(MFR) in the range of 0.1 to 1000g/10min. The copolymer has good mechanical properties, thermal stability and hydrolytic stability. Also provided is a process for preparing the copolymer.
A composition comprises a polyglycolide or a polyglycolide copolymer and a filler. The polyglycolide is prepared from glycolide by ring-opening polymerization. The composition may have a tensile modulus greater than 5, 800 MPa. The polyglycolide copolymer may have a weight-average molecular weight (Mw) in the range of 10, 000-1, 000, 000 and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) in the range of 1.0 to 10.0. The polyglycolide copolymer may have a melt index (MFR) in the range of 0.1 to 1000 g/10 min. Also provided is a process for preparing the composition.
The invention relates a process of preparing glycolide from a methyl glycolate oligomer. The process comprises pyrolyzing a methyl glycolate oligomer in a pyrolysis reaction system. The pyrolysis reaction system comprises no more than 1 wt%of a polyester, a polyol, a polyacid or a combination thereof, based on the total weight of the methyl glycolate oligomer in the system. Also provided is a composition comprising greater than 90 wt%of methyl glycolate and no more than 1 wt%of a combination of the polyester, the polyol, and the polyacid, based on the weight of the composition.
B29C 49/00 - Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mouldApparatus therefor
C08G 63/02 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds
C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids
Disclosed is a copolymer of polyglycolide and one or more additives. The copolymer may have a weight-average molecular weight(Mw) in the range of 10,000-1,000,000 and a ratio of a weight-average molecular weight to a number-average molecular weight(Mw/Mn) in the range of 1.0 to 10.0. The copolymer may have a melt index(MFR) in the range of 0.1 to 1000g/10min. The copolymer has good mechanical properties, thermal stability and hydrolytic stability. Also provided is a process for preparing the copolymer.
A composition comprises a polyglycolide or a polyglycolide copolymer and a filler. The polyglycolide is prepared from glycolide by ring-opening polymerization. The composition may have a tensile modulus greater than 5, 800 MPa. The polyglycolide copolymer may have a weight-average molecular weight (Mw) in the range of 10, 000-1, 000, 000 and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) in the range of 1.0 to 10.0. The polyglycolide copolymer may have a melt index (MFR) in the range of 0.1 to 1000 g/10 min. Also provided is a process for preparing the composition.
The invention relates to a novel composition comprising a polyglycolic acid or a polyglycolic acid copolymer and a filler. The polyglycolic acid is prepared made from methyl glycolate by polycondensation. The composition may have a tensile modulus greater than 5,800 MPa. The polyglycolic acid copolymer may have a weight-average molecular weight (Mw) in the range of 10, 000-1, 000, 000 and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) in the range of 1.0 to 10.0. The polyglycolic acid copolymer may have a melt index (MFR) in the range of 0.1 to 1000 g/10 min. Also provided is a process for preparing the composition involving direct polymerization of methyl glycolate.
The invention relates a process of preparing glycolide from a methyl glycolate oligomer. The process comprises pyrolyzing a methyl glycolate oligomer in a pyrolysis reaction system. The pyrolysis reaction system comprises no more than 1 wt%of a polyester, a polyol, a polyacid or a combination thereof, based on the total weight of the methyl glycolate oligomer in the system. Also provided is a composition comprising greater than 90 wt%of methyl glycolate and no more than 1 wt%of a combination of the polyester, the polyol, and the polyacid, based on the weight of the composition.
C08G 63/02 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds
C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids
Provided is a process for producing a product having polyglycolic acid and glycolide from methyl glycolate. The process comprises esterification, polycondensation and optimization. Also provided are a product produced by the process and a method of changing the amount of the polyglycolic acid in the product by modifying the amount of an esterification catalyst and/or adjusting the reaction temperature.
C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids
Disclosed is a branched polymer resin comprising repeating units of - (-OCH2-CO-) -or - (-CO-CH2O-) -, which is produced by ring-opening polymerization in the presence of structure regulators and optionally end-capping agents. The branched polymer resin exhibits a lower melt viscosity and a higher heat-stable temperature and suitable for melt processing.
The invention relates to a process of preparing a glycolide product from methyl polyglycolate or its product. The process comprises depolymerizing the methyl polyglycolate or its product in the presence of a depolymerization agent to make a depolymerized product; repolymerizing the depolymerized product to make a glycolic acid oligomer; and pyrolyzing the repolymerized mixture to make a glycolide product. A rare earth metal catalyst may be used facilitate the depolymerization reaction. The glycolide pyrolysis conversion rate may be greater than 90%. Also provided are related glycolide product and the glycolic acid oligomer. The glycolic acid oligomer may have a weight average molecular weight of 4, 000-80, 000.
C07C 69/675 - Esters of carboxylic acids having esterified carboxyl groups bound to acyclic carbon atoms and having any of the groups OH, O-metal, —CHO, keto, ether, acyloxy, groups, groups, or in the acid moiety of saturated acids of saturated hydroxy-carboxylic acids
C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids
C08J 11/10 - Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
C08J 11/12 - Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by dry-heat treatment only
26.
INTEGRATED PREPARATION PROCESS FOR PRODUCING POLYGLYCOLIC ACID PRODUCTS
The invention relates to an integrated process for producing a polyglycolic acid product, including polymerization, modification and molding. The resulting polyglycolic acid product may maintain the physical and chemical properties of polyglycolic acid to the greatest extent, including yellowness index (YI), weight-average molecular weight, strength and mean square radius of rotation. Also provided are the polyglycolic acid product and apparatus for carrying out the integrated process.
B29C 49/00 - Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mouldApparatus therefor
C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids
The invention relates novel polyglycolide copolymers comprising a colorant. The copolymers may have a weight-average molecular weight (Mw) in the range of 10, 000-1,000, 000, a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) in the range of 1.0 to 4.0, and a yellowness index (YI) is the range of 40-90.The copolymers may have a melt index (MFR) in the range of 0.1 to 1000 g/10 min. The copolymers may have a stable yellowness index, good thermal stability and aging resistance. Also provided are a process for preparing the copolymers and a method for reducing yellowness index change rate of a polyglycolide copolymer.
The invention relates to a process of preparing a glycolide product from methyl polyglycolate or its product. The process comprises depolymerizing the methyl polyglycolate or its product in the presence of a depolymerization agent to make a depolymerized product; repolymerizing the depolymerized product to make a glycolic acid oligomer; and pyrolyzing the repolymerized mixture to make a glycolide product. A rare earth metal catalyst may be used facilitate the depolymerization reaction. The glycolide pyrolysis conversion rate may be greater than 90%. Also provided are related glycolide product and the glycolic acid oligomer. The glycolic acid oligomer may have a weight average molecular weight of 4, 000-80, 000.
C07D 319/12 - 1,4-DioxanesHydrogenated 1,4-dioxanes not condensed with other rings
C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids
29.
INTEGRATED PREPARATION PROCESS FOR PRODUCING POLYGLYCOLIC ACID PRODUCTS
The invention relates to an integrated process for producing a polyglycolic acid product, including polymerization, modification and molding. The resulting polyglycolic acid product may maintain the physical and chemical properties of polyglycolic acid to the greatest extent, including yellowness index (YI), weight-average molecular weight, strength and mean square radius of rotation. Also provided are the polyglycolic acid product and apparatus for carrying out the integrated process.
C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids
The invention relates a novel polyglycolic acid. The polyglycolic acid comprises branched repeating units and linear repeating units. The polyglycolic acid may be produced from methyl glycolate by polycondensation in the presence of structure regulators, and exhibit excellent melt strength and thermal stability while maintaining good flowability and suitability for use in melt blow molding.
C08G 63/06 - Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxy carboxylic acids
C07D 319/12 - 1,4-DioxanesHydrogenated 1,4-dioxanes not condensed with other rings
A process for producing an alkyl nitrite is provided, comprising: mixing oxygen and a circulating gas in a pre-reactor, mixing the oxidized circulating gas and an alkyl alcohol liquid in a first esterification tower to generate alkyl nitrite, heating a portion of a first esterification tower bottom liquid in a circulating heating device external to the first esterification tower and transferring the heated collected first esterification tower bottom liquid into the first esterification tower, mixing a second portion of the collected first esterification tower bottom liquid and the circulating gas in a second esterification tower to generate alkyl nitrate, transferring a second esterification tower bottom liquid into an alkyl alcohol recycling tower. A related production system is also provided with a pre-reactor, a first esterification tower, a circulating heating device, a second esterification tower and an alkyl alcohol recycling tower.
A catalyst for treating a coal-based ethylene glycol tail gas is provided. The catalyst comprises an active component, an auxiliary agent, and a carrier. The active component comprises one or more active component elements selected from the group consisting of Cu, Pd, Pt, an oxide thereof, and a combination thereof. The auxiliary agent comprises one or more auxiliary agent elements selected from the group consisting of sixth periodic transition metals other than Group VIII, rare earth elements, an oxide thereof, and a combination thereof. The carrier is aluminum oxide. Also provided are the preparation and uses of the catalyst.
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 23/84 - 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 arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
233 as a carrier. The auxiliary agent may comprise an auxiliary element selected from the group consisting of nickel, cobalt, manganese, zirconium, cerium, lanthanum, molybdenum, barium, vanadium, titanium, iron, yttrium, niobium, tungsten, tin and bismuth. Also provided is a process for making the catalyst and a method for using the catalyst in synthesizing an oxalate in a gas phase reaction between carbon monoxide (CO) and methyl nitrite (MN).
The invention relates to a carbonylation catalyst for synthesizing an oxalate from carbon monoxide (CO) and nitrite in a gas phase is provided. The catalyst comprises an active component, an auxiliary agent and a carrier. The active component comprises palladium (Pd) particles. The auxiliary agent comprises an auxiliary element selected from the group consisting of an alkali metal, an alkaline earth metal, IB, IIB, IVB, VB, VIB, VIIB, VIII, IIIA, IVA and a lanthanide. The carrier comprises an oxide or a composite oxide. Also provided is a process for making the catalyst and a method for using the catalyst in synthesizing an oxalate in a gas phase reaction between CO and methyl nitrite (MN).
A reactor having a large-scale dimethyl oxalate or ethylene glycol production capacity is provided．The reactor comprises a shell，a gas distribution member，an internal heat exchange member，a inlet pipe member and an outlet pipe member．The large-scale dimethyl oxalate or ethylene glycol production capacity may be greater than about 400 or 200kt/a respectively．A large volume of catalysts may be used in a catalyst bed (c) having a reduced pressure drop．Also provided is a process for producing ethylene glycol on a large scale in a reactor.
B01J 8/02 - 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
A highly selective hydrogenation catalyst for hydrogenating an oxalate to ethylene glycol is disclosed. The catalyst comprises an active component, an auxiliary agent and a carrier. The active component comprises copper or an oxide thereof. The auxiliary agent is a metal selected from the group consisting of Ni, B, Bi, Fe, Ce, Mo, Sn, Co, La, Y, Nd, V and W, an oxide thereof, or a combination thereof. The carrier is selected from the group consisting of silicon, aluminum, zirconium and titanium oxide. Also disclosed is a process for preparing the catalyst.
C07C 29/149 - Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen-containing functional group of C=O containing groups, e.g. —COOH of carboxylic acids or derivatives thereof with hydrogen or hydrogen-containing gases
A hydrogenation catalyst is disclosed. The catalyst comprises an active component in the form of nanoparticles comprising copper or a cooper oxide; an auxiliary agent in the form of nanoparticles comprising an element selected from the group consisting of nickel, cobalt, manganese, zinc, aluminum, zirconium, cerium, lanthanum, molybdenum, barium, vanadium, titanium, iron, yttrium, niobium, tungsten, tin, bismuth, strontium, boron and phosphorus; and a carrier in the form of hollow silica microspheres having microsphere surfaces, wherein the nanoparticles of the active component and the nanoparticles of the auxiliary dispersed on the microsphere surfaces. The hydrogenation catalyst is useful for hydrogenating an oxalate to ethylene glycol, providing a high oxalate conversion rate, a high selectivity for ethylene glycol, strong stability and high yield. Preparation and uses of the catalyst are also disclosed.
C07C 29/149 - Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen-containing functional group of C=O containing groups, e.g. —COOH of carboxylic acids or derivatives thereof with hydrogen or hydrogen-containing gases
233 and having a bimodal pore size distribution. A catalyst comprising the carrier an active component comprising a precious metal is provided. Also provided are preparation process for preparing the carrier and the catalyst. Further provided is a method for treating a CO-coupled oxalate synthesis tail gas having nitrogen oxides to lower greatly the level of the nitrogen oxides in the tail gas.
Presented is a process for treating a tail gas having nitrogen oxides and an alkyl nitrite. The process comprises contacting the tail gas with an alkyl alcohol in the presence of oxygen to absorb the alkyl nitrite, contacting the resulting absorbed gas with a reducing gas in the presence of a catalyst to reduce the nitrogen oxides, and washing the absorbed and reduced gas to generate a treated tail gas. Also provided is a system for treating a tail gas having nitrogen oxides and an alkyl nitrite. The treated tail gas has a low nitrogen oxide content and a low alkyl nitrite content.
F23G 7/06 - Methods or apparatus, e.g. incinerators, specially adapted for combustion of specific waste or low grade fuels, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
40.
CATALYST USED FOR PRODUCING METHYL GLYCOLATE AND PREPARATION METHOD AND APPLICATION THEREOF
A catalyst used for producing methyl glycolate by using dimethyl oxalate plus hydrogen and a preparation method and an application thereof. The catalyst comprises the following components in percentage by weight: 65-90% of silicon dioxide, 5-20% of silver elements, 0.1-5% of nickel elements, 0.01-5% of lanthanum elements, and 0.01-5% of metal element M, wherein the metal element M is selected from one of titanium, cerium, cobalt, or zirconium, and the elements exist in the form of being bound with oxygen. Compared with the prior art, the preparation method has the characteristics such as simple process and easy control of the preparation process; and the hydrogenation catalyst prepared by the method has the characteristics such as high activity, long life, and wide range of reaction operation conditions.
B01J 23/89 - Catalysts comprising metals or metal oxides or hydroxides, not provided for in group of the iron group metals or copper combined with noble metals
B01J 21/06 - Silicon, titanium, zirconium or hafniumOxides or hydroxides thereof
C07C 69/675 - Esters of carboxylic acids having esterified carboxyl groups bound to acyclic carbon atoms and having any of the groups OH, O-metal, —CHO, keto, ether, acyloxy, groups, groups, or in the acid moiety of saturated acids of saturated hydroxy-carboxylic acids
C07C 67/31 - Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by introduction of functional groups containing oxygen only in singly bound form
patents
