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 - Combinaisons de machines ou d'appareils couverts par plusieurs des groupes
F26B 3/08 - Procédés de séchage d'un matériau solide ou d'objets impliquant l'utilisation de chaleur par convection, c.-à-d. la chaleur étant transférée d'une source de chaleur au matériau ou aux objets à sécher par un gaz ou par une vapeur, p. ex. l'air le gaz ou la vapeur s'écoulant à travers le matériau ou les objets à sécher de façon à les rendre lâches, p. ex. pour former un lit fluidisé
F26B 5/04 - Procédés de séchage d'un matériau solide ou d'objets n'impliquant pas l'utilisation de chaleur par évaporation ou sublimation de l'humidité sous une pression réduite, p. ex. sous vide
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 27/00 - Produits stratifiés composés essentiellement de résine synthétique
B32B 27/08 - Produits stratifiés composés essentiellement de résine synthétique comme seul composant ou composant principal d'une couche adjacente à une autre couche d'une substance spécifique d'une résine synthétique d'une sorte différente
B32B 33/00 - Produits stratifiés caractérisés par des propriétés particulières ou des caractéristiques de surface particulières, p. ex. par des revêtements de surface particuliersProduits stratifiés conçus pour des buts particuliers non couverts par une seule autre classe
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 dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés dérivés des acides hydroxycarboxyliques
C08G 63/84 - Bore, aluminium, gallium, indium, thallium, métaux des terres rares ou leurs composés
C08G 63/20 - Polyesters préparés en présence de composés ayant un groupe réactif ou plus de deux groupes réactifs
C08K 5/29 - Composés contenant des liaisons doubles carbone-azote
4.
Polyglycolic acid resin and production process thereof
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 - Polycondensats contenant des groupes ester carboxylique ou carbonique dans la chaîne principale
B29C 45/00 - Moulage par injection, c.-à-d. en forçant un volume déterminé de matière à mouler par une buse d'injection dans un moule ferméAppareils à cet effet
B29K 67/00 - Utilisation de polyesters comme matière de moulage
C07C 31/22 - Alcools trihydroxyliques, p. ex. glycérol
C07C 31/24 - Alcools tétrahydroxyliques, p. ex. pentaérythritol
C08G 18/73 - Polyisocyanates ou polyisothiocyanates acycliques
C08G 18/79 - Polyisocyanates ou polyisothiocyanates contenant des hétéro-atomes autres que l'azote, l'oxygène ou le soufre de l'isocyanate ou de l'isothiocyanate de l'azote caractérisés par le polyisocyanate utilisé, celui-ci contenant des groupes formés par oligomérisation d'isocyanates ou d'isothiocyanates
C08G 63/06 - Polyesters dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés dérivés des acides hydroxycarboxyliques
C08G 63/685 - Polyesters contenant des atomes autres que le carbone, l'hydrogène et l'oxygène contenant de l'azote
C08G 63/82 - Procédés de préparation caractérisés par le catalyseur utilisé
C08G 63/91 - Polymères modifiés par post-traitement chimique
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.
C08L 77/10 - Polyamides dérivés de groupes amino et carboxyle liés aromatiquement soit d'acides aminocarboxyliques, soit de polyamines et d'acides polycarboxyliques
6.
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 dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés dérivés des acides hydroxycarboxyliques
B29B 9/12 - Fabrication de granulés caractérisés par la structure ou la composition
B29B 9/06 - Fabrication de granulés par division de matière préformée sous forme de filaments, p. ex. combinée avec l'extrusion
B29B 9/10 - Fabrication de granulés par moulage de matière, c.-à-d. par traitement en état de fusion
C08G 63/83 - Métaux alcalins, métaux alcalino-terreux, béryllium, magnésium, cuivre, argent, or, zinc, cadmium, mercure, manganèse ou leurs composés
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 - Procédés de préparation caractérisés par le catalyseur utilisé
C08G 63/06 - Polyesters dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés dérivés des acides hydroxycarboxyliques
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 - Récupération ou traitement des résidus des polymères par coupure des chaînes moléculaires des polymères ou rupture des liaisons de réticulation par voie chimique, p. ex. dévulcanisation par traitement avec une substance organique par traitement avec des composés organiques contenant de l'oxygène contenant des groupes hydroxyle
C08J 11/26 - Récupération ou traitement des résidus des polymères par coupure des chaînes moléculaires des polymères ou rupture des liaisons de réticulation par voie chimique, p. ex. dévulcanisation par traitement avec une substance organique par traitement avec des composés organiques contenant de l'oxygène contenant des groupes acide carboxylique, leurs anhydrides ou 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 - Préparation d'acides carboxyliques, de leurs sels, halogénures ou anhydrides par réaction avec du monoxyde de carbone sur un groupe contenant de l'oxygène d'un composé organique, p. ex. d'un alcool
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 - Préparation d'acides carboxyliques, de leurs sels, halogénures ou anhydrides par réaction avec du monoxyde de carbone sur un groupe contenant de l'oxygène d'un composé organique, p. ex. d'un alcool
C07C 51/44 - SéparationPurificationStabilisationEmploi d'additifs par changement de l'état physique, p. ex. par cristallisation par 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 - Préparation d'acides carboxyliques, de leurs sels, halogénures ou anhydrides par réaction avec du monoxyde de carbone sur un groupe contenant de l'oxygène d'un composé organique, p. ex. d'un alcool
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 - Dioxanes-1, 4Dioxanes-1, 4 hydrogénés non condensés avec d'autres cycles
C08G 63/06 - Polyesters dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés dérivés des acides hydroxycarboxyliques
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 - Moulage par soufflage, c.-à-d. en soufflant une préforme ou une paraison dans un moule pour obtenir la forme désiréeAppareils à cet effet
C08G 63/02 - Polyesters dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés
C08G 63/06 - Polyesters dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés dérivés des acides hydroxycarboxyliques
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 dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés
C08G 63/06 - Polyesters dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés dérivés des acides hydroxycarboxyliques
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 dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés dérivés des acides hydroxycarboxyliques
C08G 63/84 - Bore, aluminium, gallium, indium, thallium, métaux des terres rares ou leurs composés
C07D 319/12 - Dioxanes-1, 4Dioxanes-1, 4 hydrogénés non condensés avec d'autres cycles
24.
POLYGLYCOLIC ACID RESIN AND PRODUCTION PROCESS THEREOF
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 d'acides carboxyliques dont le groupe carboxyle estérifié est lié à un atome de carbone acyclique et dont l'un des groupes OH, O-métal, —CHO, céto, éther, acyloxy, des groupes , des groupes ou des groupes se trouve dans la partie acide d'acides saturés d'acides hydroxycarboxyliques saturés
C08G 63/06 - Polyesters dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés dérivés des acides hydroxycarboxyliques
C08J 11/10 - Récupération ou traitement des résidus des polymères par coupure des chaînes moléculaires des polymères ou rupture des liaisons de réticulation par voie chimique, p. ex. dévulcanisation
C08J 11/12 - Récupération ou traitement des résidus des polymères par coupure des chaînes moléculaires des polymères ou rupture des liaisons de réticulation par voie chimique, p. ex. dévulcanisation uniquement par traitement à la chaleur sèche
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 - Moulage par soufflage, c.-à-d. en soufflant une préforme ou une paraison dans un moule pour obtenir la forme désiréeAppareils à cet effet
C08G 63/06 - Polyesters dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés dérivés des acides hydroxycarboxyliques
C08G 63/83 - Métaux alcalins, métaux alcalino-terreux, béryllium, magnésium, cuivre, argent, or, zinc, cadmium, mercure, manganèse ou leurs composés
C08G 63/84 - Bore, aluminium, gallium, indium, thallium, métaux des terres rares ou leurs composés
C08G 63/85 - Germanium, étain, plomb, arsenic, antimoine, bismuth, titane, zirconium, hafnium, vanadium, niobium, tantale ou leurs composés
C08G 63/86 - Germanium, antimoine ou leurs composés
27.
HEAT AND AGING RESISTANT POLYGLYCOLIDE COPOLYMER AND COMPOSITION THEREOF
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 - Dioxanes-1, 4Dioxanes-1, 4 hydrogénés non condensés avec d'autres cycles
C08G 63/06 - Polyesters dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés dérivés des acides hydroxycarboxyliques
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 dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés dérivés des acides hydroxycarboxyliques
C08G 63/83 - Métaux alcalins, métaux alcalino-terreux, béryllium, magnésium, cuivre, argent, or, zinc, cadmium, mercure, manganèse ou leurs composés
C08G 63/84 - Bore, aluminium, gallium, indium, thallium, métaux des terres rares ou leurs composés
C08G 63/85 - Germanium, étain, plomb, arsenic, antimoine, bismuth, titane, zirconium, hafnium, vanadium, niobium, tantale ou leurs composés
C08G 63/86 - Germanium, antimoine ou leurs composés
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 dérivés soit d'acides hydroxycarboxyliques, soit d'acides polycarboxyliques et de composés polyhydroxylés dérivés des acides hydroxycarboxyliques
C07D 319/12 - Dioxanes-1, 4Dioxanes-1, 4 hydrogénés non condensés avec d'autres cycles
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 - Catalyseurs contenant des métaux, oxydes ou hydroxydes métalliques non prévus dans le groupe du cuivre ou des métaux du groupe du fer en combinaison avec des métaux, oxydes ou hydroxydes prévus dans les groupes avec des terres rares ou des actinides
B01J 23/84 - Catalyseurs contenant des métaux, oxydes ou hydroxydes métalliques non prévus dans le groupe du cuivre ou des métaux du groupe du fer en combinaison avec des métaux, oxydes ou hydroxydes prévus dans les groupes avec de l'arsenic, de l'antimoine, du bismuth, du vanadium, du niobium, du tantale, du polonium, du chrome, du molybdène, du tungstène, du manganèse, du technétium ou du rhénium
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 - Procédés chimiques ou physiques en général, conduits en présence de fluides et de particules solidesAppareillage pour de tels procédés avec des particules immobiles, p. ex. dans des lits fixes
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 - Préparation de composés comportant des groupes hydroxyle ou O-métal liés à un atome de carbone ne faisant pas partie d'un cycle aromatique à six chaînons par réduction d'un groupe fonctionnel contenant de l'oxygène de groupes contenant C=O, p. ex. —COOH d'acides carboxyliques ou de leurs dérivés avec de l'hydrogène ou des gaz contenant de l'hydrogène
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 - Préparation de composés comportant des groupes hydroxyle ou O-métal liés à un atome de carbone ne faisant pas partie d'un cycle aromatique à six chaînons par réduction d'un groupe fonctionnel contenant de l'oxygène de groupes contenant C=O, p. ex. —COOH d'acides carboxyliques ou de leurs dérivés avec de l'hydrogène ou des gaz contenant de l'hydrogène
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.
B01J 35/10 - Catalyseurs caractérisés par leur forme ou leurs propriétés physiques, en général solides caractérisés par leurs propriétés de surface ou leur porosité
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.
B01D 53/18 - Unités d'absorptionDistributeurs de liquides
F23G 7/06 - Procédés ou appareils, p. ex. incinérateurs, spécialement adaptés à la combustion de déchets particuliers ou de combustibles pauvres, p. ex. des produits chimiques de gaz d'évacuation ou de gaz nocifs, p. ex. de gaz d'échappement
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 - Catalyseurs contenant des métaux, oxydes ou hydroxydes métalliques non prévus dans le groupe du cuivre ou des métaux du groupe du fer combinés à des métaux nobles
B01J 21/06 - Silicium, titane, zirconium ou hafniumLeurs oxydes ou hydroxydes
C07C 69/675 - Esters d'acides carboxyliques dont le groupe carboxyle estérifié est lié à un atome de carbone acyclique et dont l'un des groupes OH, O-métal, —CHO, céto, éther, acyloxy, des groupes , des groupes ou des groupes se trouve dans la partie acide d'acides saturés d'acides hydroxycarboxyliques saturés
C07C 67/31 - Préparation d'esters d'acides carboxyliques par modification de la partie acide de l'ester sans introduction d'un groupe ester par introduction de groupes fonctionnels avec de l'oxygène lié uniquement par liaison simple
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