4257 results about "Esterification reaction" patented technology

This invention relates to a process for producing a polyester comprising the steps of:

• • (g) obtaining an aqueous homogenous solution of isosorbide;
  • (h) feeding the aqueous homogenous solution of step (a) into a reactor;
  • (i) feeding one or more glycols and one or more dicarboxylic acids either into the aqueous solution of step (a) or into the reactor of step (b) either prior to, during and/or subsequent to step (b);
  • (j) esterifying the reactor contents at sufficient temperatures and pressures, and optionally in the presence of suitable catalysts, to effect esterification;
  • (k) forming a prepolymer; and
  • (l) polycondensing the prepolymer at sufficient temperatures and pressures in the presence of a suitable catalyst to effect polycondensation to form a polyester.

An aqueous binder composition, useful for making fiber products, especially fiberglass insulation, comprising an aqueous substantially alkaline (pH of at least 5.0) solution of a polyol and a hydrolyzed (solubilized) copolymer of maleic anhydride and a vinyl aromatic compound, preferably styrene (i.e., a SMA copolymer); the copolymer is solubilized using ammonia, a secondary alkanolamine (preferably diethanolamine (DEA)), a tertiary alkanolamine (preferably triethanolamine (TEA)), or a mixture thereof and the binder composition is cured as a consequence of cross-linking, esterification reactions between pendant carboxyls on the solubilized (hydrolyzed) copolymer (SMA) chains and hydroxyl groups of the polyol, including the diethanolamine and/or triethanolamine preferably used in the solubilization of the SMA.

An aqueous binder composition, useful for making fiber products, especially fiberglass insulation, comprising an aqueous substantially alkaline (pH of at least 5.0) solution of a polyol and a hydrolyzed (solubilized) copolymer of maleic anhydride and a vinyl aromatic compound, preferably styrene (i.e., a SMA copolymer); the copolymer is solubilized using ammonia, an ammine, a primary alkanolamines (preferably monoethanolamine), a secondary alkanolamine (preferably diethanolamine (DEA)), a tertiary alkanolamine (preferably triethanolamine (TEA)), or a mixture thereof and the binder composition is cured as a consequence of cross-linking, esterification reactions between pendant carboxyls on the solubilized (hydrolyzed) copolymer (SMA) chains and hydroxyl groups of the polyol, including the diethanolamine and/or triethanolamine preferably used in the solubilization of the SMA.

An aqueous, formaldehyde-free binder composition comprising a modified copolymer of maleic anhydride and a vinyl aromatic compound such as styrene, the copolymer being modified by reaction with a primary alkanolamine, such as monoethanolamine (MEA), to produce a modified copolymer that is self-curing and cures as a consequence of cross-linking, esterification reactions between pendant carboxyls and hydroxyl groups on the solubilized (hydrolyzed) modified copolymer chains; the invention also relates to the corresponding method of using the binder composition for making fiber products, especially fiberglass insulation.

The invention relates to a preparation method of a star polycarboxylic acid high-performance water reducing agent. Polybasic alcohol and (methyl) acrylic acid used as main raw materials for esterification are esterified and polymerized to prepare the star polycarboxylic acid high-performance water reducing agent material: the (methyl) acrylic acid and polybasic alcohol used as reactants are esterified under the action of a catalyst to firstly prepare a star polymerizable active terminal, and free-radical polymerization reaction is carried out with unsaturated polyethenoxy ether, molecular weight regulator and unsaturated carboxylic acid monomer under the action of an initiator to prepare the star polycarboxylic acid high-performance water reducing agent. The invention is easy to control, and has the advantages of high polymerization degree, low cost and no pollution; the esterification reaction is carried out form an active core, and the free-radical polymerization is carried out to generate the chain arm, thereby implementing the polycarboxylic acid high-performance water reducing agent in a star molecular structure; and under the condition of common doping amount and low doping amount, the star polycarboxylic acid high-performance water reducing agent has better cement paste flowability and holding capacity than the traditional linear and comb polycarboxylic acid water reducing agents, and has favorable cement adaptability and concrete application performance.

A method of depolymerizing polyethylene terephthalate, and a method of manufacturing a polyester resin. When heating, melting and depolymerizing polyethylene terephthalate to be recycled, the heating, melting and depolymerization reaction of the polyethylene terephthalate to be recycled are carried out all at once using one or a plurality of extruders or using an extruder and a reactor provided at an outlet of the extruder. When manufacturing a polyester resin, the reactants are irradiated with microwaves, thus promoting the heating of the reactants, and promoting the esterification reaction.

The invention pertains to the new material technical field, and relates to a method for preparing a carbonaceous solid acid catalyst and biodiesel by taking pure natural biological substances as raw materials. The method is characterized by: taking the pure natural and renewable biological substances as the raw materials; adopting the technical route and method of low-temperature carbonization firstly, oxidation secondly and sulfonation then according to the constituent and structural characteristics to prepare the bio-carbonaceous solid acid catalyst; and adopting a continuous rectification-water separating esterification reaction technology to produce the biodiesel by carrying out the catalytic esterification reaction of a free fatty acid or waste oil and short chain alcohol. The raw materials adopted by the invention are rich in resources, low in price, pure natural and renewable, which pertains to waste utilization; the preparation technology is simple with moderate and controllable reaction conditions; the catalyst has the advantages of high activity, good stability, easy recycling and no corrosion to equipment, which is an really environment-friendly catalyst, thus being applicable to the large scale industrial production of the biodiesel. The method can also be applied to a plurality of organic reactions such as alkylation, hydrolysis and hydration, etc.

The invention relates to polyester fibres and a preparation method thereof. The raw material of the polyester fibres is modified polyester which consists of a terephthalic acid chain segment, an ethylene glycol chain segment and a branched chain-containing dihydric alcohol chain segment. The preparation method of the polyester fibres comprises the following steps: performing esterification reaction on terephthalic acid and branched chain-containing dihydric alcohol under the catalysis of concentrated sulphuric acid to obtain terephthalic acid dihydric alcohol ester; then, preparing the terephthalic acid and the ethylene glycol into slurry, and performing the esterification reaction on the slurry to obtain the terephthalic acid ethylene glycol ester; finally, stirring and mixing the terephthalic acid dihydric alcohol ester and the terephthalic acid ethylene glycol ester, and performing condensation polymerization in a low vacuum stage and a high vacuum stage under the action of a catalyst and a stabilizing agent to obtain modified polyester; metering, extruding, cooling, oiling, stretching, heat-setting and winding the polyester to prepare the polyester fibres. The increasing amplitude of the spatial gaps of the polyester fibres is much higher than that of branched chain-free polyester fibres at the same temperature, which is beneficial to the degree of micro particles, such as a dye, that enter the polyester; the dyeing rate is improved.

The invention provides a PET-based graphene composite material, a preparation method thereof, and an aerostat. The preparation method comprises the following steps: 1, carrying out an esterification reaction or an ester interchange reaction on ethylene glycol modified graphene oxide and a PET monomer to obtain a head product, wherein the PET monomer is terephthalic acid and/or dimetyl terephthalate; and 2, carrying out a condensation polymerization reaction on the head product to obtain the PET-based graphene composite material. The in situ polymerization reaction of the ethylene glycol modified graphene oxide and the PET monomer is carried out to make graphene oxide be dispersed in the reaction process of ethylene glycol and the PET monomer, so the dispersibility of graphene in the PET-based graphene composite material is improved. The preparation method directly adopting the PET monomer as a raw material has the advantages of simple process, short preparation period, low cost, and suitableness for large-scale technologic production; and the PET-based graphene composite material prepared in the invention has excellent gas barrier property and mechanical strength.

The invention relates to a method for preparing a fish oil ethyl ester microcapsule from fish pomace, which mainly comprises the extraction of fish oil, the preparation of fish fatty acid ethyl ester, the purification of fish oil ethyl ester and the preparation of a fish oil ethyl ester microcapsule, wherein the extraction of fish oil comprising the following steps: eliminating foreign matters from fish viscus, cleaning, mashing, adding pepsin and neutral protease for enzymolysis, then adding anhydrous alcohol, standing to stratify, and centrifuging to obtain the fish oil; the preparation of fish fatty acid ethyl ester comprising the following steps: mixing the fish oil with ethanol, making the mixture to be subject to an esterification reaction under the catalysis of sodium ethylate, vaporizing the ethanol, washing with water, and then centrifuging to obtain the fish oil ethyl ester; in the purification process, supercritical CO2 extraction is adopted, the purified fish oil ethyl ester is a golden yellow transparent liquid, and EPA ethyl ester and DHA ethyl ester contents thereof are more than 50%; and the preparation of a fish oil ethyl ester microcapsule comprises the following steps: mixing sodium alginate, maltodextrin and sodium caseinate, dissolving in water, adding the purified fish oil ethyl ester, and adopting a spray drying method to obtain the powdered fish oil ethyl ester microcapsule which can hide the fishy smell of the fish oil ethyl ester, improve the mouth feel and be beneficial to packaging and storage.

The invention discloses a process for purifying glufosinate-ammonium, which comprises: (1) adding glufosinate-ammonium hydrochloride into an alcohol R1OH to perform an esterification reaction, and after the reaction is accomplished, cooling, filtering, removing solvent from filtrate and obtaining ester product of glufosinate-ammonium; (2) adding the ester product of glufosinate-ammonium, which isobtained by step (1), into water solution of hydrochloric acid to perform a hydrolysis reaction, and obtaining glufosinate-ammonium hydrochloride by post treatment; (3) adding the glufosinate-ammonium hydrochloride obtained by the step (2) into an alcohol R2OH, introducing epoxy ethane and obtaining glufosinate-ammonium acid; and (4) adding the glufosinate-ammonium acid obtained by the step (3) into an alcohol R3OH, introducing ammonia gas, and obtaining glufosinate-ammonium after the reaction is finished. In the invention, the process for purifying glufosinate-ammonium comprises simple steps, the inorganic salt content in the obtained glufosinate-ammonium is low, and the purity of the obtained glufosinate-ammonium is high; the process for separating glufosinate-ammonium hydrochloride from HCl by epoxy ethane is more economic than the conventional process which adopts epoxypropane and epoxy chloropropane; and the method is very safe and has a very bright industrialization prospect.

The invention relates to low melting point copolyester and a preparation method thereof. The low melting point copolyester is made from the following monomers followed by the esterification reaction and the polycondensation reaction: (a) terephthalic acid (PTA) and isophthalic acid (IPA), (b) 1, 4- butanediol (BDO) and (c) polyethylene glycol 600 to 6000 (PEG); wherein, in the a component, the feeding mass ratio of the terephthalic acid and the isophthalic acid is between 80 to 20 : 20 to 80; in the c component, the feeding weight ratio of polyethylene glycol is 1 to 30 percent based on the a; the molar ratio of the a and the b is 1:1.5 to 2.3. The preparation method comprises an esterifcation stage and a polycondensation stage. The copolyester has the characteristics of low melting point, good crystallization property, high intrinsic viscosity and difficult adhesion of particles, and is suitable for spinning the filament, the staple fibers and the non-woven fabrics.

The invention discloses a spherical montmorillonite mesoporous composite carrier and a preparation method thereof, a supported benzenesulfonic acid catalyst and a preparation method thereof, an application of the catalyst in an esterification reaction, and a preparation method of ethyl acetate. The spherical montmorillonite mesoporous composite carrier contains montmorillonite and a mesoporous molecular sieve material, average particle size of the spherical montmorillonite mesoporous composite carrier is 30-60 micrometers, the specific surface area is 150-600 square meters/gram, pore volume is 0.5-1.5 milliliters/gram, aperture distribution is trimodal distribution, most probable apertures corresponding to three peaks are 2-4 nanometers, 5-15 nanometers and 10-40 nanometers respectively. The provided supported benzenesulfonic acid catalyst has the advantages of high catalytic activity and repeated usage.

The invention provides an enzymolysis lignin epoxy resin and a preparation method thereof. The raw materials include: an enzymolysis lignin-dianhydride prepolymer, a glycidol ether, a catalyst, a curing agent and a filler. The preparation method comprises the following steps that: under the action of the catalyst, an etherification of a hydroxyl group contained in the enzymolysis lignin or a derivative of the enzymolysis lignin and dianhydride is carried to synthesize a prepolymer of enzymolysis lignin-dianhydride; then the prepolymer reacts with the glycidol ether and undergoes etherification and ring closing reaction to obtain an enzymolysis lignin--polyester type epoxy resin. The enzymolysis lignin adopted by the method is natural macromolecular material extracted from the residues which is produced in the preparation of alcohol through the fermentation of wood chips, bamboo and stalk, thereby not only effectively utilizing biological resources, but also replacing petrochemical raw materials. The enzymolysis lignin epoxy resin which can be used as a modifier for engineering materials, adhesives, paints and macromolecular materials has a broad application prospect.

The invention proposes a compounding formula and manufacture method of a sustained release-type polyocarboxy acid high performance water reducing agent. The compounding formula comprises esterification reaction formula and copolymerization reaction formula. The invention combines the esterification reaction and copolymerization reaction into one to carry on after the improvement of the craftwork. The invention utilizing non-solvent esterification method achieves the esterification reaction in the lower temperature (75 DEG C) through using the compound catalyst. Compared with the two steps, the invention has better application performance. The invention synthesizes sustained release-type polyocarboxy acid high performance water reducing agent through the adjustment of the reaction condition and the kind and type of components in each reaction. The product is suitable for the concrete with high request to the control of the slump.

A method for producing epoxy plasticizer from refused animal and vegetable oil is carried out by adding refused oil 97-99.8wt% and porous carrier solid acid 0.2-3wt% into reactor, inducing into gas-phase methanol at 95-130degree, agitating for 1-4hrs, esterification reacting, separating out solid acid, adding liquid 70-80wt%, methanol 15-25wt% and solid alkali catalyst 1-5wt% into reactor, agitating at 50-65degree and normal pressure for 0.5-2hrs, separating out to obtain aliphatic acid methoxy-carbonyl, adding hydrogen peroxide 25-5wt%, methane acid 2.5-10wt% and sodium tripolyphosphate 0-1wt% into aliphatic acid methoxy-carbonyl 55-70wt%, agitating for 8-10hrs at 60+-5degree, reacting, separating out acid water, neutralizing, washing and dewatering to obtain the final product. It's simple, cheap and has less consumption.

The invention relates to a method for preparing a modified copolyester composite fiber, in particular to a method for preparing a low-melting-point polyester composite fiber by adopting continuous polymerization and melt direct-spinning. The method comprises the following steps: slurry is prepared from raw materials in proportion and added continuously into an esterification system for an esterification reaction, an obtained oligomer is uniformly mixed with polyether, the mixture enters a homogenizing kettle for transesterification and pre-polycondensation, a product is uniformly mixed with a chain extender for final polycondensation, and an obtained low-melting-point polyester melt and a common polyester melt enter a composite spinning assembly to prepare the low-melting-point polyester composite fiber which comprises a common polyester core layer and a low-melting-point polyester cortex layer. The method has the advantages as follows: a side reaction of thermal degradation of polyether components is inhibited effectively, and the color and spinnability of the low-melting-point polyester melt are improved; the problem of poor performance of composite spinning of the low-melting-point polyester on the cortex layer and the common polyester on the core layer due to large dynamic viscosity difference of the melt is solved, and the composite fiber is well formed; the production efficiency of the low-melting-point polyester composite fiber is improved.

The invention discloses a continuous production method for biodegradable aliphatic-aromatic copolyester. The method comprises the following steps: respectively subjecting aromatic diacid and aliphatic dibasic acid to an esterification reaction with aliphatic dihydric alcohol so as to obtain two ester compounds; subjecting the two ester compounds to condensation polymerization so as to obtain biodegradable aliphatic-aromatic copolyester. According to the invention, aliphatic dibasic acid and aromatic diacid are respectively subjected to esterification, and since fat in the aliphatic dibasic acid has a low temperature, formation amount of tetrahydrofuran in the process of esterification is reduced; the chain extender isocyanate which has great toxicity is not used in the method, thereby reducing harm to environment and human bodies.

The present invention provides a starch ester and the preparation method as well as the application of the starch ester. The starch ester takes natural starch as raw material and is obtained through esterification. The present invention is characterized in that: a degradation reaction takes place before and after the esterification. The preparation method of the starch ester lies in that the natural starch is degraded to reduce the viscosity of the starch. And then the starch experiences esterification to generate starch ester, which is low-viscosity starch ester. Or the natural starch material experiences the esterification first to generate starch ester, which then takes the degradation reaction to reduce the viscosity of the starch ester so as to generate low-viscosity ester. The present invention is suitable to the oily substances such as oil plants, flavors, spices and so on which are of stable emulsification and good effect in water. The present invention also provides the application of the starch ester as emulsification stabilizer in the thin system such as in the drinks and so on.

The invention relates to a polyester chip modified by the blend with side chain aliphatic diol and a preparation method thereof. The polyester chip is copolymerized by the following monomers: (1) terephthalic acid; (2) ethylene glycol; (3) sodium or potassium 5-sulfoisophthalic acid dibasic ester; and (4) the blend of 2-methyl-1,3-propanediol and 2,2-dimethyl-1,3-propanediol. The preparation method comprises the following steps: adding terephthalic acid and ethylene glycol in a first esterification kettle, adding catalyst and stabilizer simultaneously to perform esterification reaction, transferring the material to a second esterification kettle, injecting the blend of 2-methyl-1,3-propanediol and 2,2-dimethyl-1,3-propanediol to perform esterification with sodium or potassium 5-sulfoisophthalic acid dibasic ester; and (2) transferring the material to a polycondensation kettle, discharging, pelletizing and drying. The modified polyester chip of the invention is used to prepare the cationic or disperse dye atmospheric deep dyeing copolyester fiber; and the method is simple, has low cost and is suitable for industrial production.

The invention discloses a method for preparing a star polycarboxylate water reducing agent. The method comprises the following specific steps: performing an esterification reaction between polyalcoholic hydroxyl-containing organic molecules and a carboxyl-containing chain transfer agent under the effect of a catalyst to obtain a star RAFT chain transfer agent; enabling the star RAFT chain transfer agent, an unsaturated acid small monomer, an unsaturated macromonomer and an initiator to react for 3-5h at 60-90 DEG C; and adding alkali to adjust the pH value to 6-7 to obtain the star polycarboxylate water reducing agent. According to the method disclosed by the invention, the product performance is adjusted by controlling the temperature, monomer proportion and molecular weight of the macromonomer, the reaction is quick, the efficiency is high, and the operation is simple. The polycarboxylate water reducing agent prepared by the method is a functional polycarboxylate high-efficiency water reducing agent, and the product performance is stable.

The invention relates to a preparation method of a transparent flame-retarding polyester film, comprising the following steps: mixing 100 parts of terephthalic acid and 35 parts of glycol; adding mixed liquid of 7.3-11.6 parts of structural phosphorus flame retardant and 30 parts of glycol, 3-4 parts of catalyst and 1.5-3 parts of stabilizing agent; carrying out esterification reaction for 0.5-1hat 100-115 DEG C under 400-600 pa; carrying out condensation polymerization for 2-3h at 260-290 DEG C under 10-70 pa to obtain a copolymerization lame-retarding polyester slice; after 35-50 percent ofcopolymerization lame-retarding polyester slice is crushed, mixing, extruding and granulating the copolymerization lame-retarding polyester slice and 2.6-6.3 parts of addition type flame retardant toprepare a blending lame-retarding polyester slice; after the residual copolymerization lame-retarding polyester slice and the blending lame-retarding polyester slice are crushed, adding 0.04-0.085 part of antiblocking agent, mixing and then transmitting into an extruder in a mixing mode; and preparing a film with a thickness with 50-300 micron by casting pieces, stretching in a bidirectional mode, thermally forming and rolling.

The invention relates to hyperbranched polyester modified acrylic resin and a preparation method thereof. Firstly, a By-type polyhydroxylated compound is taken as nuclear molecules (wherein B represents hydroxyl, and the degree of functionality y of B is larger than of equal to 2), ABx-type polyhydroxy acid is taken as divergence molecules (wherein A represents carboxyl, B represents hydroxyl and x represents the degree of functionality of hydroxyl and is larger than or equal to 2), a polyester-type hyperbranched polymer with hydroxyl at the terminal is obtained through a vacuum fusion polycondensation method, and esterification reaction is performed on prepared hyperbranched polyester and acrylic resin with carboxyl in the presence of a water-carrying agent to obtain hyperbranched polyester modified acrylic resin. Acrylate with hyperbranched polyester introduced enriches a great amount of hydroxyl, and is taken as a cross-linking group to greatly reduce the curing time of a coating film; and at the same time, hyperbranched polyester has excellent performance of dendritic polymer, molecular chains are not easily twisted, and hyperbranched polyester modified acrylic resin with high solidity and low viscosity can be obtained. According to the invention, the source of raw materials is wide, the price of the raw materials is low, the synthetic method is simple, the controllability is good, and the production cost is low.

The present invention relates to an aqueous alkali-developable photosensitive polyimide precursor resin composition that is appropriate for highly heat-resistant transparent protection layers and insulation layers for liquid crystal display devices. In more detail, the present invention relates to a negative-type photosensitive transparent polyimide precursor resin composition manufactured in two steps. The first step is the manufacture of a transparent linear polyamic acid (A) from (a-1) one or more kinds of tetracarboxylic acid dianhydrides selected from alicyclic tetracarboxylic acid dianhydrides having 3 to 30 carbon atoms; and (a-2) one or more kinds of diamines selected from aliphatic, alicyclic, or non-conjugated aromatic diamines, having 3 to 30 carbon atoms, having one or more ethylenically unsaturated bonds at side chains as essential components; and the second step is the manufacture of reactive transparent polyimide precursors shown in the following Chemical Formula 1 according to the esterification reaction of the above polyamic acid (A) with ethylenically unsaturated compound (B) containing an epoxy group in the same molecule as the main component. The photosensitive transparent polyimide precursor resin compositions according to the present invention have a superior photosensitivity, and thus, may be used for transparent protection layers and insulation layers of liquid crystal display devices having superior heat resistance, chemical resistance, mechanical strength, and electricity insulation.

A method for recovery of highly pure alkyl lactate and lactic acid is provided, which includes a step 1 for producing source liquid comprising lactic acid or ammonium lactate; a step 2 for dehydrating the source liquid product of step 1; a step 3 for producing liquid mixture by sequentially adding and stirring alcohol and acid solution to the dehydrated source liquid; a step 4 for separating and removing ammonium salt precipitation from the liquid mixture of step 3; a step 5 for producing alkyl lactate from ammonium salt-free liquid mixture by esterification reaction; and a step 6 for separating alcohol and alkyl lactate by distillation from the mixture of step 5.

The invention relates to a high-uniformity polyester industrial yarn used for a safety belt and a production method thereof. The raw material of the high-uniformity polyester industrial yarn is modified polyester composed of a terephthalic acid chain segment, a glycol chain segment and a branched chain-containing dihydric alcohol chain segment. The production method is characterized in that terephthalic acid and branched chain-containing dihydric alcohol are subjected to an esterification reaction under catalysis of concentrated sulfuric acid to obtain dihydricalcohol terephthalate; then terephthalic acid and glycol are prepared for the esterification reaction to obtain ethylene terephthalate; finally ethylene terephthalate and dihydricalcohol terephthalate are stirred and mixed, under a catalyst and a stabilizing agent, the condensation polymerization reactions under a low vacuum phase and a high vacuum phase are carried out to prepare the modified polyester, and the modified polyester is subjected to metering, extrusion by a porous spinneret, cooling, oiling, stretching, thermoforming and reeling to prepare the high-uniformity polyester industrial yarn.

The invention discloses a method for preparing biodegradable polyester from consumed polyester. The method comprises the following steps of: reacting the consumed polyester and divalent alcohol under the action of a catalyst at the temperature of between 190 and 250 DEG C to decompose the polyester to a corresponding oligomer by the alcohol; adding aliphatic dibasic acid or esterification derivative of the aliphatic dibasic acid and acid or alcohol of multifunctional groups into the oligomer, and performing esterification reaction at the temperature of between 180 and 240 DEG C to obtain corresponding esterification products; and performing condensation polymerization reaction on the esterification products to obtain biodegradable aliphatic-aromatic copolyester. By the method, the consumed and reclaimed polyester material can be directly converted into a biodegradable polyester material, and a virtuous circle channel is provided for reclamation and utilization of non-degradable polyester white pollutants; and the biodegradable polyester material has excellent mechanical and processing properties.

Disclosed are a hydrothermally stable porous molecular sieve catalyst and a preparation method thereof. The catalyst consists of a product obtained by the evaporation of water from a raw material mixture comprising a molecular sieve having a framework of Si—OH—Al—, a water-insoluble metal salt and a phosphate compound. The catalyst maintains its physical and chemical stabilities even in an atmosphere of high temperature and humidity. Accordingly, the catalyst shows excellent catalytic activity even when it is used in a severe process environment of high temperature and humidity in heterogeneous catalytic reactions, such as various oxidation/reduction reactions, including catalytic cracking reactions, isomerization reactions, alkylation reactions and esterification reactions.

The invention relates to a technology and a device system for producing dimethyl oxalate by high-pressure carbonylation of industrial synthesis gases and producing ethylene glycol through dimethyl oxalate hydrogenation. The technology comprises the following steps: adopting industrial NO, O2 and methanol as raw materials for an esterification reaction to produce methyl nitrite; adopting industrial CO and methyl nitrite for a carbonylation reaction in a plate reactor to produce carbonylation products, which mainly include dimethyl oxalate and dimethyl carbonate; separating the carbonylation products to obtain dimethyl carbonate products; subsequently adding hydrogen into dimethyl oxalate in the plate reactor to produce ethylene glycol products; conducting the coupling recovery treatment on waste acids in the esterification reaction and purge gases in the carbonylation reaction for recycling. The device system comprises an esterification reaction system, a carbonylation reaction system, a coupling recovery system for purge gases and waste acids and a hydrogenation reaction system. The technology has the characteristic that device consumption is remarkably reduced, and particularly the nitric acid waste liquid recycling and purge gas recycling technologies as well as the separation technologies thereof are highly coupled; recycling of the raw materials in reaction waste gases is realized, and the effect is remarkable.

The invention relates to a method for continuously preparing modified polyester, comprising the following steps: conveying PET AND EG to an esterification autoclave from a feed port for esterification reaction, so as to obtain terephthalic acid ethylene glycol low polymer; then inputting the low polymer melt to a polycondensation autoclave through a pipeline for polymerization reaction with SIPM or multi-simplexes and addition agent, thus obtaining modified polyester melt and then carrying out granulation or direct spinning; wherein the two ends of the pipeline are respectively connected with the esterification autoclave and the polycondensation autoclave, when the low polymer melt flows through the pipeline, ethylene glycol solution of the SIPM or multi-simplexes and addition agent are added to the pipeline and mixed evenly with the low polymer melt in the pipeline, meanwhile the later-stage esterification reaction is carried out, and the mixture enters the polycondensation autoclave for polymerization reaction. With the method of the invention adopted, continuous industrialized production is realized, production cost is greatly reduced; in addition the SIPM or multi-simplexes with special groups are evenly distributed on the backbone of the polyester, as a result, high quality modified polyester products can be obtained for sure in the later stage.