31results about How to "Improve the efficiency of esterification reaction" patented technology

An emulsifier able to stabilize the emulsified food system is prepared from the starch of early long-grained non-glutinous rice, octylenyl succinyl oxide, water, and NaOH through mixing said starch with water, stirring, using NaOH to regulate pH value, adding octylenyl succinyl oxide within one hour while stirring, controlling temp while stirring, using NaOH to regulate pH value, using HCl to regulate the pH value of resultant, washing for removing HCl and residual oetylenyl succinyl oxide, centrifugal separation and spray drying.

The invention provides a method for preparing polybutadiene with 2-furanoic acid ester group, comprising the following steps: adding hydroxyl-terminated polybutadiene, 4-dimethylaminopyridine and an organic solvent into a reactor, stirring at room temperature fully Mix well; cool the mixture to 0°C, slowly add 2-furoyl chloride, then stir the reaction, the reaction temperature is 0°C~room temperature, and the reaction time is 1h~48h; the mixture is washed, dried, concentrated organic phase, and separated and purified by column chromatography Obtain product terminal 2-furanoate group polybutadiene. In the present invention, while using 4-dimethylaminopyridine as an acid-binding agent, the efficiency of the esterification reaction can be effectively improved, and the 2-furoyl chloride has high reactivity and low cost, and avoids the use of dicyclohexylcarbodiimide. The reaction operation and post-treatment in the invention are simple and safe, the yield is stable in the scale-up preparation process, and has great industrial application potential.

The invention provides a production method of biodiesel. The production method comprises the steps of preprocessing of raw oil, esterification reaction, transesterification, dealcoholization, washing, distillation and deodorization, methanol distillation and recycling, glycerin purification and recycling and other steps. The production method has the advantages that the utilization rate of raw oil is high; few esterifying catalysts are needed; the catalytic activity is high; the esterification reaction is performed within a short time; a water-bath heating system is adopted, so that the temperature of heating a medium can be controlled effectively, and the generated unsaponifiable matters can be effectively decreased; in addition, the heat produced in reaction can be recycled, thus the energy consumption is reduced; the unreacted methanol can be recycled that the production cost is reduced. The biodiesel has acid value up to 0.5mgKOH / g and yield up to more than 92%, has the quality meeting BD100, and is suitable for industrial production.

A process for preparing the phosphoesterified starch includes such steps as proportionally adding phosphate mixture and polyoxyvinyl ether stearate as promoter to the starch milk, regulating pH=5.0-6.5, reacting for 3-10 hr, centrifugal separation, and drying.

Provided is an esterification method for preparing biodiesel using waste oils and fats. Under the normal pressure condition, the mixture of methanesulfonic acid, ethanesulfonic acid or chlorosulfonic acid and erosion restraint agents is used as a catalyst, the using amount of the catalyst is little, the catalyst can be repeatedly used, erosion on equipment is small, through a demister arranged on the top of a reaction kettle, the utilization rate of raw oil and the yield coefficient of coarse methyl ester are improved, heat generated in the reaction process is used for preheating fine methyl alcohol and waste oils and fats, heat is circularly used, energy loss is reduced, methyl alcohol which is not reacted is recovered, and production cost is lowered. The acid value of raw materials of the esterification method is wide (15-180mgKOH / g), the reaction time is short, energy loss is little, production cost is low, the yield coefficient of coarse methyl ester is high, high-acid-value flora and fauna waste oils and fats are esterified in one time to be lower than 1mgKOH / g in acid value, the next transesterification can be directly carried out to prepare biodiesel, and the method is suitable for producing biodiesel in an industrial mode.

The invention discloses a method for synthesizing tributyl citrate. The method comprises the following steps: I, preparing a choline chloride acidic ionic liquid; II, performing esterification reaction; III, filtering the reaction system after reaction, thereby obtaining solid choline chloride and a liquid phase product; and IV, performing atmospheric distillation on the liquid phase product, washing residues generated after atmospheric distillation by using an alkali solution, adding activated carbon to decolor, filtering to remove the activated carbon, performing reduced pressure distillation on residues generated after filtration, and collecting fraction of 197-200 DEG C, thereby obtaining tributyl citrate. According to the method, choline chloride and citric acid are adopted to synthesize the acidic ionic liquid, the synthesized acidic ionic liquid is both a raw material and a catalyst, the acidic ionic liquid has esterification reaction with n-butyl alcohol to synthesize n-butyl alcohol, the efficiency of the esterification reaction is improved, the conversion rate can be greater than 90%, the choline chloride after esterification can be recycled and utilized, and the cost is low.

The invention discloses a catalytic esterification method of oil with a high acid value, relating to the esterification of higher fatty acid and providing a catalytic esterification method of oil with a high acid value. The method comprise the steps of: adding oil with a high acid value and an esterifying water carrying agent into a reactor and stirring, when reaching a preset reaction temperature, adding a catalyst, and reacting to obtain obtaining a reactant. The oil with the high acid value can be at least one selecting from waste oil, gleditsia sinensis lam, waste catering oil, hogwash oil, animal and plant oil containing the higher fatty acid and the higher fatty acid; the esterifying water carrying agent can be selected from low-carbon alcohol and can be added with glycerol; The low-carbon alcohol is distilled off in azeotropy with water, which ensures that the reaction balance moves to the right and a solid-acid catalyst has improved reaction efficiency and prolonged service life; the glycerol is used as an esterifying agent and can be subjected to reaction at higher temperature so as to improve esterification efficiency. Solid superacid is used as the catalyst with no sidereaction, easy separation with a product, reusability and low production cost; and moreover, the method has high reactivity, fast speed and mild conditions.

The invention discloses a preparation method of starch octenyl succiniade under the supercritical condition. The method comprises the following steps: simultaneously performing an oxidation reaction and an esterification reaction using starch as a raw material, hydrogen peroxide or sodium hypochlorite as an oxidant, ocentyl succinic anhydride as an esterifying agent and supercritical CO2 as a reaction medium under stirring to obtain an esterification product; and extracting the esterification product with supercritical CO2 to obtain the purified powdery starch octenyl succiniade of which viscosity is 5-25mPa.s (6%, 95 DEG C) and degree of substitution is 0.005-0.12. The invention provides an environmentally-friendly green chemical synthesis method; and the method has the advantages of lowimpurity content, high reaction efficiency, good product quality and the like.