51results about How to "Shorten the reaction time of esterification" patented technology

The improved continuous esterification process of waste animal and vegetable oil and grease with low carbon alcohol to prepare biodiesel oil features that liquid low carbon alcohol is introduced into the liquid comprising liquid waste animal and vegetable oil and grease in 95-99.9 wt% and acid catalyst in 0.1-5 wt% to produce esterification reaction at normal pressure and the temperature from vaporizing temperature to 95 deg.c while the vapor mixture comprising the resultant, water vapor and low carbon alcohol vapor is discharged from the top of the reactor and separated in a fractionating tower to obtain product, separated water and liquid low carbon alcohol for reuse. The process has high reaction speed, high reaction conversion rate and other advantages, and the product has acid value capable of being controlled below 2 mgKOH/g.

The invention discloses a preparation method of glyceride type fish oil, comprising the following steps: (1) taking 650-800g of glyceride type fish oil and 110-180g of alkali at weight ratio, dissolving alkali in 0.4-1.6L of water, evenly mixing in a reactor, and adding the glyceride type fish oil; (2) introducing nitrogen into the reactor until material is completely reacted; (3) cooling materials in the reactor to be below 25DEG C; (4) extracting by petroleum ether or n-hexane to obtain free polyunsaturated fatty acid; (5) adding the free polyunsaturated fatty acid into the reactor; (6) adding zinc powder into the reactor; (7) immediately pouring reaction liquid into crushed ice for quenching reaction; and (8) extracting a crude product subjected to quenching reaction by the petroleum ether or n-hexane, and washing an organic layer with saturated salt water to obtain the glyceride type fish oil. The preparation method disclosed by the invention has the advantages of short preparation time and low manufacture cost, the prepared glyceride type fish oil keeps high content of EPA (Eicosapntemacnioc Acid) and DHA (Docosahexaenic Acid) and also has high content of triglyceride.

The invention relates to a preparing method of aliphatic/aromatic copolyester. The method includes: subjecting raw material monomers comprising an aromatic diacid, an aliphatic (alicyclic) diacid and an aliphatic (alicyclic) dihydric alcohol to esterification at 150-230 DEG C under the function of a titanium catalyst and a synergistic catalyst; subjecting the reaction system to prepolymerization at 230-260 DEG C under a vacuum degree of 200-300 Pa for 1-2 h; and subjecting products of the prepolymerization to polycondensation at 240-270 DEG C under a vacuum degree not more than 200 Pa for 3-5 h to obtain the aliphatic/aromatic copolyester. The preparing method adopts a direct esterification method and omits a transesterification method, thus avoiding production of methanol that is a byproduct and reducing environment pollution. The preparing method obviously shortens the esterification time, simplifies processes and equipment, and provides technical support for continuous industrial production of the aliphatic/aromatic copolyester.

The invention relates to esterifying reaction catalyst used animal and vegetable grease to manufacture biological diesel oil. It belongs to using anima and vegetable grease to manufacture biological diesel oil technique field. The catalyst includes A, B, and C three components; the A can be one or many of cadmium sulfate, zinc sulphate, or aluminium sulphate; the B is sulfuric acid quadric-ammino combine copper; the C is chromic oxide and aluminium sulfide. The invention also offers the manufacturing method. The esterifying reaction catalyst can effectively control the reaction direction to make the reversible reaction toward producing fatty acid methyl ester to make fatty glyceride esterifying ratio reach above 90%. Compared with the catalyst and application method, the invention can reduce catalyst reaction temperature, shorten catalyst reaction time, reduce end product processing program, and effectively increase biological diesel oil production quality, and reduce the fabrication cost.

The invention provides a preparation method of a low-melting-point PBT copolyester fiber, which comprises the following steps: butanediol is used as a raw material, a direct esterification method is adopted, dibasic acid and dihydric alcohol monomers with the molar ratio of 1:1.5-1:2.5 are simultaneously added, esterification, prepolymerization and polymerization reaction are carried out under theaction of a catalyst, and the PBT copolyester with the melting point ranging from 140 DEG C to 190 DEG C is prepared, wherein the esterification reaction and the prepolymerization reaction are carried out in two stages. The prepared PBT polyester is subjected to melt spinning after being dried, and is subjected to oiling, balancing, winding and drafting after being cooled. According to the preparation method of the low-melting-point PBT copolyester fiber,, dibasic acid and dihydric alcohol monomers are simultaneously added in the polymerization process of the PBT, and the esterification and prepolymerization reaction processes are carried out in stages, so that the melting point of the PBT is reduced, the fluidity of the PBT melt is improved, the toughness of the PBT is increased, the impact strength is improved, the prepared low-melting-point PBT polyester fiber has the advantages of low modulus, high elasticity and good hand feeling, and can also be used as a substitute adhesive torealize the bonding function.

The invention discloses overdosed esterification production technology for n-octyl gallate, which comprises the following steps: reacting gallic acid raw materials with n-octyl alcohol for an esterification reaction in the presence of an organic sulfonic acid catalyst; vaporizing and concentrating the filtrate under reduced pressure; adding cyclohexane for recrystallization; washing the filtrate by using purified water until the PH is between 6.0 and 7.0; and performing vacuum drying to obtain the end product of n-octyl gallate. The overdosed esterification production technology for the n-octyl gallate has the advantages of obviously shortening the esterification reaction time, having high reaction conversion rate, saving the high temperature distillation process under reduced pressure and reducing the damage to reaction products due to high temperature. The n-octyl alcohol is a reactant and a solvent used for the reaction, and the production cost is reduced.

The invention relates to a method for inhibiting the side reaction of tetrahydrofuran in a polymerizing process. According to the method, in the process of preparing a polymer by using terephthalic acid and 1,4-butanediol as main raw materials, ester, titanium-silicon-cobalt composite catalyst dispersant and pH regulator are generated by adding the terephthalic acid and dihydric alcohol in the esterifying stage, the molar ratio of the terephthalic acid to the 1,4-butanediol is controlled to be 1:(1.05-1.10) to inhibit the side reaction of tetrahydrofuran, so that the content of tetrahydrofuranin the polymer is less than or equal to 10wt%; the dispersing medium in the titanium-silicon-cobalt composite catalyst dispersant is 1,4-butanediol, and the titanium-silicon-cobalt composite catalystis prepared by combining a titanium-silicon composite catalyst and a cobalt catalyst, and the titanium-silicon composite catalyst is prepared from a silicon catalyst-supported titanium catalyst. According to the method for inhibiting the side reaction of tetrahydrofuran in a polymerizing process, the final product has concentrated molecular weight distribution, few byproduct and high quality, andhas a great application prospect.

The invention relates to preparation of a hydrophobically-modified transition metal oxide-immobilized organosilicone sphere catalyst and application of the catalyst to preparation of polyester. According to the invention, dibasic acid and dihydric alcohol are used as monomers and a hydrophobically-modified transition metal oxide-immobilized organosilicone sphere is used as a catalyst, so polyesteris prepared under mild conditions. The catalyst used in the preparation can effectively reduce esterification time, lower polycondensation temperature, decrease the loss of raw materials and reduce the probability of occurrence of side reactions of a system.

The invention discloses a method for preparing microalgae biodiesel through an esterification reaction. The method comprises the following steps that a culture medium is inoculated with chaetoceros gracilis, the culture medium is irradiated with a red-blue light LED light supplementing lamp for 12 h per day to 16 d per day, the chaetoceros gracilis is cultured for 5 days to 8 days at the temperature of 26 DEG C to 28 DEG C, and then chaetoceros gracilis cells can be collected; the collected chaetoceros gracilis cells are subjected to wall-breaking treatment through ultrasonic waves and then extracted through an organic solvent to obtain microalgae grease, the microalgae grease, methyl alcohol and a zeolite molecular sieve catalyst are added into a reactor according to the mass ratio of 1:(6-8):(0.01-0.03) to be subjected to the esterification reaction to obtain an esterification product, the esterification product is separated and extracted, and then the biodiesel can be obtained; According to the method, the chaetoceros gracilis which is short in production period, wide in distribution and high in photosynthesis and grease content is taken as the raw material, and therefore the problems existing in vegetable grease raw materials in biodiesel development are solved; meanwhile, the advantages of being simple in preparation technology, high in catalytic efficiency, grease extraction rate and product yield and the like are achieved, and a foundation is laid for biodiesel industrialization and scale.

The invention relates to a preparation method for a cold-resistant plasticizer dioctyl sebacate, and belongs to the field of PVC auxiliary agents. The preparation method comprises the following steps: esterification, dealcoholysis, neutralization, distillation, adsorption and press filtration. The technical scheme employs 2-ethylhexanol and sebacic acid as raw materials and employs one or more titanates as a catalyst for esterificatoin, and then excessive 2-ethylhexanol is removed; then neutralization is performed, and a dioctyl sebacate crude product is prepared; and then the dioctyl sebacate crude product is subjected to reduced-pressure distillation, adsorption and press filtration, the high-quality high-yield high-purity cold-resistant plasticizer dioctyl sebacate product is prepared. The product quality reaches super grade standard.

The invention discloses a method for preparing biodiesel by taking algae as raw materials. The method comprises the following steps that a culture medium is inoculated with pavlova viridis, irradiation is conducted through a red and blue LED fill light for 10 h/d to 16 h/d, culturing is conducted for 8 d to 10 d at the temperature of 25 DEG C to 27 DEG C, and then pavlova viridis cells can be collected; the collected pavlova viridis cells are added into a high-speed ball mill to be crushed and then extracted with an organic solvent to obtain microalgal oil, 1 part by weight of microalgal oil, 5-7 parts by weight of methanol and 0.03-0.05 part by weight of zeolite molecular sieve catalyst are added into a reactor to generate an esterification reaction, esterification products are obtained and then separated and purified, and the biodiesel is obtained. According to the method, by taking the pavlova viridis which is short in production cycle, wide in distribution, high in photosynthesis and high in oil content as the raw material, the problems existing in vegetable oil raw materials in boidiesel development are solved. Meanwhile, the method further has the advantages of being simple in preparation technolog, high in catalytic efficiency, high in oil extraction ratio, high in product yield and the like, and a good foundation is laid for industrialization and large scale of the biodiesel.

The invention discloses a biodiesel production method which comprises the following steps: inoculating crypthecodinium cohnii to a medium; irradiating for 10-14h per day with a red-blue double-color LED fill light; culturing for 6-7 days at 23-26 DEG C to obtain organic crypthecodinium cohnii cells; performing wall breaking treatment of the collected crypthecodinium cohnii cells, and extracting with an organic solvent to obtain microalgae oil; adding the microalgae oil, methanol and a zeolite molecular sieve catalyst into a reactor according to a mass ratio of 1:(5-7):(0.01-0.04) for an esterification reaction to obtain an esterified product; and separating and purifying the esterified product to obtain the biodiesel. In the method disclosed by the invention, by adopting the crypthecodinium cohnii with short production cycle, wide distribution, strong photosynthesis and high oil content as a raw material, the problems of vegetable oil raw material in biodiesel development are solved. The method also has the advantages of simple preparation technology, high catalysis efficiency, high oil extraction rate, high product yield and the like and lays a good foundation for the industrial and large-scale production of biodiesel.

The invention belongs to the technical field of pectin and particularly relates to an esterification method of pectin. The esterification method comprises the steps as follows: firstly, pectin is dissolved in water, vacuum freeze drying is performed, and a pectin solid is obtained; the pectin solid obtained through vacuum freeze drying is dispersed in an alcoholic solution in the solid-liquid ratio being 1:(1-50), inorganic acid is added for an esterification reaction, filtration is performed, and esterified pectin is obtained; the alcoholic solution obtained after filtration can be used for the pectin esterification reaction repeatedly. The esterification method has the advantages that the operation is convenient, the alcoholic solution can be recycled repeatedly, and no pollution is caused. The method can be used for preparing pectin esterified products with the esterification degree being 20%-95%, and esterification groups linked with galacturonic acid units correspond to used alcohol types.