139results about How to "Promote esterification reaction" patented technology

The invention relates to an esterification deacidification process for high acid number rice bran oil, and the process can well solve the problem of a low refining rate. The esterification deacidification process for high acid number rice bran oil comprises grease pretreatment, namely two steps of degumming and decolorizing. A decolorized substance is obtained after the decolorizing, and then esterification deacidification is carried out. The concrete operating method comprises the following steps of: adding glycerin after the decolorized substance is stirred and heated at a vacuum degree of 0.09 MPa; adding a catalyst of zinc oxide or zinc to carry out a catalytic reaction to generate low acid number rice bran oil with an acid number of 5-7mgKOH / g. The zinc oxide or zinc which is taken as the catalyst of the esterification deacidification of the high acid number bran oil can effectively boost the esterification reaction and rapidly reduce the acid number; simultaneously the process overcomes the problems of the low refining rate lying in a traditional refining method and a great deal of sewage produced by a chemical alkali refining method; the zinc oxide or zinc has a low price, thereby reducing production cost; compared with other chemical esterification catalysts, the zinc oxide or zinc has a very low toxity, thereby being very suitable for the production of edible grease.

The invention provides an esterification method of pentaerythritol, which comprises the following step: under the action of a tin catalyst, carrying out esterification reaction on pentaerythritol and saturated fatty acid to obtain pentaerythritol ester, wherein the saturated fatty acid is one or more of butyric acid, valeric acid, hexanoic acid, heptylic acid, octanoic acid, pelargonic acid and capric acid. The esterification method provided by the invention has the advantages of higher product yield, higher product quality, simple esterification after-treatment and low pollution. The experimental result indicates that the conversion rate of the esterification reaction is greater than 99.5%, and the hydroxyl value in the reaction product is lower than 1mg KOH / g.

The invention provides a production technique of persimmon mead, which comprises the following steps: using persimmon and honey as raw materials; adding Aspergillus niger to treat persimmon juice; eliminating precipitate and astringency by utilizing tannase and pectinase generated by the Aspergillus niger; adding the honey, and adding Saccharomyces cerevisiae; fermenting the honey persimmon juice; and finally, treating the liquor with cobalt 60-gamma rays to promote the liquor to become mature. Thus, the invention greatly shortens the maturing time of the persimmon mead, thereby producing the fruit mead with unique flavor and abundant nutrients in a short time.

The invention relates to a preparation method of cellulose acetate propionate, belonging to technical field of cellulose modification. The preparation method of cellulose acetate propionate comprises the following steps of: taking cellulose as a raw material, activating by a mixed solution of acetic anhydride and propionic anhydride, adding acetic acid and propionic acid solvents and a solid super acidic catalyst for esterification, after esterification, filtering to remove the catalyst, adding waste acid water for hydrolyzing, settling out by waste acid water, and finally obtaining the cellulose acetate propionate by steps of filtering, washing, drying and the like. The production process is simple to operate, the solid super acidic catalyst substitutes the concentrated sulfuric acid catalyst and can be cyclically used for many times, thus alleviating the problem of serious corrosion of the original process equipment. The waste acid water generated in the reaction process only contains acetic acid and propionic acid without sulfuric acid and can be fully recovered and cyclically used, thus decreasing the tension in environmental protection, realizing zero discharge and greatly reducing the production cost. The cellulose acetate propionate prepared by the method has fine toughness, heat stability and compatibility, thus being extensively used.

The invention relates to the technology of accelerating aging of brandy, and in particular relates to a method for quickly aging brandy by controlling irregular oak by oxidation-reduction potential combined high-pressure and micro-aerobic. The method comprises the following steps: putting brandy raw wine into a container; adding irregular oak; introducing oxygen into the brandy raw wine in the container, and applying a certain electric field intensity to control the oxidation reduction potential of the brandy raw wine to be 20mV-200mV. Therefore, extraction on the irregular oak by the brandy raw wine can be accelerated, and the aging time can be shortened. According to the method, the effect of aging the brandy raw wine for 10-30 minutes can be close to that of natural aging for 6-12 months, the aging time can be greatly shortened, and the aging efficiency can be remarkably improved.

The invention belongs to the technical field of preparation of starch, belongs to the technical field of preparation of modified starch, and in particular relates to a method for preparing octenyl succinic acid modified starch and application thereof. The method comprises the following steps of: drying the starch serving as a raw material and performing constant weight of the starch to reach a certain water content; grinding the starch to obtain activated starch; adding distilled water into the starch to oscillate and adding alkali to regulate pH; slowly adding octenyl succinic acid (OSA) into the starch; adding acid to neutralize after the reaction is finished; performing alcohol washing on the mixture; centrifugally collecting wet starch; drying the wet starch; pulverizing the wet starch; and screening to obtain the octenyl succinic acid modified starch. The method is characterized in that the raw material starch is mechanically activated before esterification reaction is carried out; and the reaction activity of the starch is increased, the substitution degree of the OSA is increased, the reaction time is shortened, the using amount of the alkali is reduced, and the production of the octenyl succinic acid modified starch is facilitated in a ball milling mode. The method can be used for food, such as starch glue, microcapsule wall materials, yoghourt, steamed sponge cakes, cakes and the like.

The invention belongs to the fine chemical field, which is mainly used for the synthesis of rubber accelerator NS and the intermediate raw material of the rifampicin-tert-butylamine. The invention is characterized in that: the methyl tert-butyl ether-hydrocyanic acid method is adopted to produce tert-butylamine; under normal pressure, the methyl tert-butyl ether is added with hydrocyanic acid and is added with concentrated sulphuric acid to carry out fully catalytic reaction; the methanol produced in the catalytic reaction is fully adopted and is added with water to perform hydrolysis, deep hydrolysis and esterification, and methyl formate and methanol without react completely are distilled; sulphates in calcium hydroxide solution and the butylamine to replace the butylamine to gain the butylamine through rectification and produce the byproduct calcium sulfate. The invention adopts the water instead of the methanol to carry out the hydrolysis and esterification and neutralizes the raw materials and adopts the calcium hydroxide to produce butylamine, which has the advantages of simple process, short production period, high yield, stable product quality, low production cost and small environment pollution.

The invention discloses a method for accelerating aging of a litchi distilled spirit by virtue of synergistic effects of ozone and ultrasonic waves. The method comprises the following step: sequentially performing five steps, namely primary ultrasonic treatment, primary ozone treatment, secondary ultrasonic treatment, secondary ozone treatment and ultra-filtration on a litchi distilled spirit which is obtained by fermenting whole litchi juice and then distilling to obtain the litchi distilled spirit. The litchi distilled spirit treated by using the method disclosed by the invention has typical litchi aroma, and is soft and mellow in taste; and the content of aroma substances such as ethyl acetate, ethyl propionate, ethyl lactate, ethyl laurate, phenylethanol and the like can be increased by more than 50% compared with that of the litchi distilled spirit before treatment so as to ensure that the content of fusel oil components in the litchi distilled spirit can be reduced by more than 40%, indexes of each component are close to that of a litchi distilled spirit subjected to five years of natural aging, and the ozone treatment can also play a certain turbidity removal effect on a wine liquid.

The invention relates to alkyd resin coating preparing technology. It includes the following steps: according to mass shares fatty acid 30-40, glycerol 20-30, ion liquid 1-10 are stirring at 50-100 degree centigrade for 1-5h; adding into benzene anhydride 35-45, toluene or methyl benzene 3-6 to do back flow reaction at 220-240 degree centigrade for 3-5h; cooling, diluting, filtering to gain the alkyd resin coating. The invention is a green clear technological line which can increase esterifying reaction, reduce oxygen absorbed for coating oxidation drying, simplify operational program, reduce cost, fit for industrialization production in certain scale etc.

The invention discloses a novel technique for producing methyl acetate. Acetate is refluxed to carry residual excessive water in the esterifying kettle away in the industrial production process; and a continuous process, comprising reaction rectification, acetate recovery, methyl ester rectification, wastewater treatment and the like, is utilized to conveniently and efficiently prepare the high-purity methyl acetate. The method overcomes the defects of difficulty in separating and purifying the product methyl acetate in the process of producing methyl acetate by esterifying reaction of acetic acid and methanol. The technique has the advantages of low equipment requirement, low energy consumption and simple technique. The product prepared by the method is suitable for organic solvents, polyurethane foam foaming agents, thinners and the like required in the production process of resins, coatings, inks, paints, adhesives and leather.

The invention discloses an alcohol ether diesel, comprising ingredients having the following parts by weight respectively: finished diesel, isobutanol, refined acidified oil, methanol, 200<#> solvent oil, petroleum acid, dimethyl tert-butyl ether and catalytic incendiary agent. The invention realizes the esterification reaction between methanol and fatty acid under normal temperature, saves energy and simplifies the production process for fatty acid methyl ester; the methanol, which is not subjected to the esterification reaction, is coupled by the isobutanol so as to avoid the methanol from existing in the products in the manner of direct ionization, thus further improving the flash point of the alcohol ether diesel.

The invention discloses citrus steamed fish sauce and a preparation method thereof, and belongs to the technical field of food fermentation engineering. According to the citrus steamed fish sauce disclosed by the invention, the technology that soybeans, flour, bran, citrus peels and purple perilla are used as starter propagation raw materials and aspergillus oryzae 3.042 and aspergillus niger 3.350 cooperate for starter propagation is adopted, at the middle stage of fermenting soy sauce mash, saccharomyces rouxii is added, and at the later stage, torulopsis bombicola is added. The aspergillus niger has higher cellulose activity, lipase activity and pectinase activity, and can achieve the enzyme system complementary effect with the aspergillus oryzae 3.042. The activity of the cellulase, the activity of the lipase and the activity of the pectinase obtained at the stage of starter propagation are higher, the cellulase, the lipase and the pectinase are used for decomposing the citrus peels and the purple perilla and promoting the release of various active substances in the citrus skins and the purple perilla. The addition of the two kinds of salt resistant fragrance-producing yeasts at the middle stage and the later stage of fermentation can promote the formation of flavor substances of the steamed fish sauce, improve the flavor of the steamed fish sauce and increase the kinds of the flavor substances.

The invention belongs to the technical field of wine making, and particularly relates to a mulberry wine making technology and the mulberry wine obtained through the same. The mulberry wine making technology comprises the steps of fruit selecting, sterilizing, yeast liquid preparing, initial fermenting, sealing fermenting, magnetization aging accelerating and the like. According to the mulberry wine making technology, heating and sulfur dioxide adding are not needed in the mulberry wine making process, the aging accelerating effect is achieved through a strong magnetic field, therefore, nutritional ingredients in mulberry fruits can be effectively prevented from being destroyed, the growth cycle is shortened to about 3 months from 6-12 months in traditional fermentation, and the production efficiency of the mulberry wine is improved. The made mulberry wine is full in wine body, has the inherent color of the mulberry fruits, is clear and transparent, has the pure, quiet and tasteful, pleasant and harmonious mulberry fruit aroma and wine aroma and accords with the taste of modern people.

The invention relates to a wood-plastic composite material and a preparation method thereof, belonging to the field of molecular materials. The wood-plastic composite material comprises the following raw materials in parts by weight: 80-110 parts of plant fiber, 50-90 parts of grafting plastic, 0.2-5 parts of catalyst, 0.2-2 parts of antioxidant and 0.3-3 parts of lubricant, wherein the catalyst is selected from one or more of sodium hydrogen sulfate, potassium hydrogen sulfate, ammonium dihydrogen phosphate, sodium dihydrogen phosphate, ammonium polyphosphate and SO4<2-> / MxOy type solid super-strong acid. According to the invention, the performance advantages of the plant fiber and the grafting plastic are used; and the esterification reaction between the plant fiber and the grafting plastic is promoted through a method of adding the catalyst, and the interface compatibility of the plant fiber and the grafting plastic is improved, thus enhancing the mechanical performance of the wood-plastic composite material.

The invention provides a preparation method of benzofuran-2-(3H)-ketone, comprising: under the stirring state and in the presence of dilute sulphuric acid, carrying out intramolecular esterification reaction on 2-hydroxyphenylacetic acid in water-carrying agent containing benzene rings at the temperature of 100-160 DEG C; in the reaction process, causing azeotrope formed by the water-carrying agent and water generated by reaction to enter a water knockout drum after condensation reflux; forming an aqueous layer and an oil layer in the water knockout drum; removing the aqueous layer; causing the oil layer to flow back to a mixed system of the 2-hydroxyphenylacetic acid and dilute sulphuric acid; and after reaction ends, obtaining the benzofuran-2-(3H)-ketone, wherein the concentration of the dilute sulphuric acid is 2-9 mol / L, and the molar ratio of sulphuric acid to the 2-hydroxyphenylacetic acid is 30-110:1. By utilizing the method provided by the invention to prepare the benzofuran-2-(3H)-ketone, the yield is higher.

The invention mainly aims to solve the problems caused by degumming in the process of processing abandoned oil serving as raw materials. By dry-method degumming, the series of problems can be solved effectively. The method comprises the following steps of: adding a certain amount of acid (strong phosphoric acid: citric acid is 2:1) into a material system, and reacting at the temperature of 100 and 115 DEG C for 55 to 85 minutes, so that phospholipid in the abandoned oil serving as the raw materials is flocculated to form large granular flocculate; stirring a mixture, which serves as an adsorbent, of quantitative silica gel and carclazyte continuously for 50 and 80 minutes under the vacuum degree of between 0.080 and 0.098 Mpa, wherein the addition of the adsorbent is between 0.5 and 2.0 percent; and cooling the integral material system to a certain extent, filtering the hot material system, and filtering out colloid and part of pigments by adsorption. The process has a simple operational condition, does not generate oil foot, is less in pollution, can improve the yield of products by over 2 percent, achieves the discoloring effect while degumming, and improves the quality of oils obviously.

The invention discloses a dry degumming method of raw abandoned oil used for producing biodiesel. The method comprises steps that: (1) the abandoned oil is dehydrated; (2) a composite acid with a weight of 0.2 to 1.0% of that of the abandoned oil is added to the abandoned oil, wherein the composite acid is composed of strong phosphoric acid and citric acid according to a ratio of 2:1; the mixture is subject to a reaction for 50 to 90min under a reaction temperature of 100 to 120 DEG C, such that phospholipids form macro flocculating constituents; (3) a degumming absorbent with a mass of 0.5 to 2.0% of that of the raw materials is added to the raw materials; a vacuum degree is controlled at 0.080 to 0.098Mpa, a temperature is controlled at 110 to 130 DEG C, and the mixture is stirred for 30 to 60 min with a rate of 50 to 70r / min; (4) the mixture is processed through press filtration, and an obtained filtrate is a production raw material of biodiesel. The method provided by the invention has advantages of simple technology, high yield, and low production cost. Also, the method is energy saving and environment friendly.

The invention discloses a skin wound repairing preparation which is prepared by dissolving hyaluronic acid, 4-dimethylamino pyridine, 1-(3-dimethylamino propyl)-3-ethyl carbodiimide hydrochloride in dimethyl sulfoxide, and performing magnetic stirring at the room temperature so as to obtain a hyaluronic acid solution; mixing pulullan with dimethyl sulfoxide, and uniformly stirring so as to obtain a pulullan solution; slowly dripping the pulullan solution into the hyaluronic acid solution to react for 4-48 hours at 40-80 DEG C, dialyzing the reaction liquid, and performing freeze-drying on the obtained dialysis liquid, thereby obtaining the skin wound repairing preparation. The skin wound repairing preparation disclosed by the invention has multiple effects of isolating bacteria, absorbing effusion of a wound surface, keeping the wound surface wet, promoting the wound surface to heal and the like, moreover is wide in preparation raw material resource, low in cost, gentle in synthesis condition, concise in production route, good in operability, and easy in production quality control, and most importantly has relatively higher security and clinical use values when being compared with a conventional similar product.

The invention relates to the field of concrete, and particularly discloses concrete utilizing industrial solid waste and a preparation method of the concrete, and the concrete utilizing the industrial solid waste is prepared from the following raw materials in parts by weight: 260-270 parts of cement; 45-55 parts of fly ash; 35-45 parts of mineral powder; 710-720 parts of fine sand; 990-1000 parts of broken stone; 10-12 parts of a water reducing agent; 140-160 parts of water; and 100-150 parts of modified waste polyurethane particles; wherein the modified waste polyurethane particles are obtained by coating the surfaces of waste polyurethane particles with modified slurry and curing, and the modified slurry is prepared from cement, a cement accelerator, plant fibers and water. The concrete has the advantage that the thermal insulation property and compressive strength of the concrete are improved.

The invention belongs to the chemical field of bio oil, and in particular relates to a method for preparing biodiesel by utilizing oil plants. The invention discloses a method for preparing biological diesel by utilizing oil plants. The method utilizes the seeds oil plants as raw materials; an oil extraction solvent and a transesterification solvent form a double liquid phase mixed solvent; and in the presence of a solid base catalyst, the double liquid phase mixed solvent in different volumes is refilled for grease extraction and a transesterification reaction. The invention mainly solves the problem that one step synthesis of biodiesel by double liquid phase mixed solvent in the prior art has disadvantages of inhibition on the synthesis of biodiesel by reaction raw materials and inability to increasing yield, and provides a high-efficiency and high-yield method for synthesis of biodiesel.

The invention discloses a method for detecting ethrel. The method includes the following steps: ethrel in a sample is extracted; a detection solution of ethrel derivatives is prepared, the sample is extracted through an analytical reagent, then sulfuric acid is used as a protective agent, heptafluorobutanol and heptafluorobutyric anhydride are used as derivatization reagents to make the ethrel inthe sample derive into the derivatives under the temperature condition of 60-120 DEG C, and then a chromatography reagent is added to obtain the detection solution; a derivative ethrel working solution is prepared; GC-MS / MS chromatographic analysis is conducted; an external standard method is used for quantification, the mass concentration of a target object is used as an abscissa, the corresponding peak area is used as an ordinate, and a standard curve is drawn. The ethrel is stable in the process of derivation, the speed of an esterification reaction is high, the speed of derivation is high,sensitivity is high, qualitative and quantitative detection is accurate, operation is easy, use of hypertoxic reagent diazomethane can be avoided, and the environment is protected.

The invention relates to a hybrid polyester esterification reactor, comprising a heating reaction tank and an evaporating reaction tank. The reactor also comprises a dynamic hybrid section, wherein the outlet of the heating reaction tank is communicated with the inlet of the evaporating reaction tank; the dynamic hybrid section is provided with a venturi tube and a power pump matched with the venturi tube; the inlet and the outlet of the dynamic hybrid section are respectively connected with the outlet of the evaporating reaction tank and the inlet of the heating reaction tank so as to form a circulating channel for materials; the venturi tube is provided with a suction inlet for introducing fresh slurry. The reactor utilizes the characteristics that the venturi tube sucks the serum while hybriding the slurry so as to effectively improve the hybrid effect, and is combined with the power pump and the heating power so as to effectively form circulation of the slurry, so that the whole structure of the reactor is simpler, and the operation is more convenient, the materials can be hybrided more evenly, and the esterification reaction can be more convenient. The reactor is mainly used for the esterification reaction process for the polyester.

The invention relates to a preparation method of cellulose acetate propionate mixed ester with high propionyl content. Cellulose is prepared from the following components in parts by weight: 650g of wood pulp, 2630g of propionic acid, 40g of acetic anhydride, 2070g of propionic anhydride and 19.5-52g of a catalyst, wherein the ratio of a liquid acid catalyst to heteropolyacid catalyst is 4:6 to 6:4. The preparation method comprises the steps of activating, carrying out esterification reaction, mixing, adding a magnesium acetate solution, hydrolyzing and carrying out chromatography; and then, sequentially carrying out conventional filtration, washing and drying to obtain a finished product. The preparation method has the advantages that the finished product of cellulose acetate propionate, prepared by using the method, contains more than or equal to 46% of propionyl content and less than or equal to 2% of acetyl and is stable in performance; the catalyst is a mixture of liquid acid and heteropolyacid, so that the consumption of sulfuric acid is reduced, furthermore, corrosion to process equipment and environment pollution can be reduced, and the process safety can be improved; and meanwhile the heteropolyacid is additionally applied, so that the esterification reaction is accelerated, and hydrolysis reaction is more precise and controllable.

The invention discloses a technological method for producing biological diesel oil by utilizing an ultrasonic technology. The technological method comprises the following steps: collecting waste hogwash oil; carrying out dehydration, deodorization and impurity removal treatment on the waste hogwash oil to obtain raw oil; enabling the raw oil to pass through a flashing tower, introducing the raw oil into a synthetic tank filled with methanol; after finishing synthesis of the raw oil and the methanol, adding glycerol and mixing; after uniformly mixing, carrying out ester exchange reaction by utilizing an ultrasonic reaction kettle; after reacting, recycling the methanol; separating the raw oil, which is subjected to esterification reaction, by utilizing a rectifying tower so as to obtain light-component oil, middle-component oil and heavy-component oil respectively; introducing the light-component oil, the middle-component oil and the heavy-component oil into a finished-product synthetic tank, and synthesizing finished-product biological diesel oil according to national standards (GB / 100). Compared with a traditional technology, the technological method has the advantages of simplicity in operation, low cost, environment friendliness, high yield and the like; the yield can be improved to 90 percent and the production cost per ton is reduced by 10 percent to 20 percent; the technological method is suitable for industrial production and has wide application prospect.

The invention relates to a biodiesel preparation device and a biodiesel preparation method. The device comprises a magnetic stirring mechanism, an ultrasonic esterification reaction mechanism, and a liquid phase splitter. The magnetic stirring mechanism comprises a stirring tank, a vertical round permanent magnet, a magnetic ionic liquid storage tank, and a raw material storage tank. A layering baffle plate is arranged in the middle part of the stirring tank, such that the stirring tank is divided into an upper stirring chamber and a lower stirring chamber. The bottom the lower stirring chamber is recessed, and the vertical round permanent magnet is rotatably arranged in the recess. The raw material storage tank and the magnetic ionic liquid storage tank respectively communicate with the lower part and the upper part of the lower stirring chamber through pipelines. The ultrasonic esterification reaction mechanism comprises an esterification reactor and an ultrasonic generation unit which are connected. Upper and lower parts of the esterification reactor respectively communicate with the upper stirring tank and the liquid phase splitter through pipelines. With the device provided by the invention, a magnetic stirring effect and an ultrasonic high-frequency oscillation effect are integrated. Raw oil, methanol and a catalyst are fully mixed, and are subjected to ultrasonic effect, such that an esterification reaction is enhanced, and biodiesel preparation speed is increased.

The invention discloses a self-cleaning and fireproof multifunctional coating for a steel structure and a preparation method of the self-cleaning and fireproof multifunctional coating. The multifunctional coating comprises a component A and a component B, wherein the component B comprises a curing agent, and the component A comprises the following components: in parts by mass, 30-40 parts of silicone-modified waterborne polyurethane resin, 3-8 parts of modified nano titanium dioxide, 5-10 parts of a hydroxide inorganic flame retardant and 25-40 parts of an intumescent flame retardant. The silicone-modified waterborne polyurethane resin is adopted as a film-forming substrate, the advantages of silicone and polyurethane can be achieved at the same time, and good heat resistance and mechanical properties are exhibited; and meanwhile the modified nano titanium dioxide is added to the formula, the hydrophobicity of the coating is increased, the self-cleaning ability is improved, and the coating has both functions of fire proofing and self-cleaning.

The invention provides a derivative for podophyllotoxin. The derivative is characterized in that the derivative is a carboxyl single methoxypolyethylene glycol derivative of podophyllotoxin with the following structural formula. The preparation method comprises the following the steps that: the podophyllotoxin, the carboxyl single methoxypolyethylene glycol, dicyclohexyl imine and N dimethylaminopyridine are used as raw materials to prepare the polyethylene glycol derivative of the podophyllotoxin by the microwave catalytic action. The podophyllotoxin prodrug of the derivative is good in solubility and high in stability. The preparation of the derivative has the characteristics of high efficiency, rapidness, simpleness and convenience and high reaction yield.

The invention provides a preparation method of 1-cyano-2-allyl acetate. The preparation method comprises an esterification reaction and distillation. Acrolein cyanohydrin and liquid acetic anhydride are subjected to the esterification reaction in the presence of a catalyst and inorganic acid to prepare a reaction solution containing ACA, an ACA product is obtained after distillation, and the esterification reaction further comprises the step of introducing gaseous acetic anhydride into a reaction system. The invention further provides a preparation device of 1-cyano-2-allyl acetate. Accordingto the method and the device, acetic anhydride is ingeniously divided into two parts to be fed, one part is separated out to serve as acetic anhydride steam which is fed into an esterification reaction tower from the bottom of the tower, heat required by reaction can be provided, acetic acid can be effectively blown off, the esterification reaction can be accelerated through effective removal of acetic acid, and the reaction efficiency is improved. The device is characterized in that a conductivity meter is arranged in the esterification reaction tower to monitor the reaction process on line,so that the timeliness and effectiveness of reaction process control are guaranteed.

A method for preparing a biodegradable polyester elastomer includes a step of carrying out an esterification reaction to produce a glycerol-sebacic acid prepolymer, a glycerol-maleic acid prepolymer, or a glycerol-adipic acid prepolymer. The esterification reaction is carried out between sebacic acid, maleic acid, or adipic acid and glycerol in a molar ratio of 1:1-2 with an effective amount of sulfated titania under a vacuum pressure of 300-600 mTorr. Therefore, the production time of the biodegradable polyester elastomer can be reduced significantly.

The invention relates to a process of producing a cellulose carbamate fiber filament, and belongs to the technical field of cellulose carbamate fiber production. Through specific cellulose activation, cellulose carbamate preparation, cellulose carbamate solution preparation, and spinning steps, a complete cellulose carbamate fiber filament producing process having a high degree of completion is formed. A prepared spinning stock solution has good spinnability, a final product has good performance, the process is particularly suitable for industrial large-scale production, and the production cost, the production efficiency and product quality are all taken into account.