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 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.

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.