Catalytic esterification method of oil with high acid value

Abstract

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.

Description

technical field [0001] The invention relates to a higher fatty acid esterification reaction, in particular to a method for pretreating high-acid-value oil in a biodiesel production process. Background technique [0002] With the development of society, the energy crisis is becoming more and more serious, and oil resources are becoming increasingly depleted. People urgently need new energy sources to replace oil fuels. Environmental problems also require people to look for non-polluting energy sources. With its unique advantages, biodiesel has attracted more and more attention. [0003] Biodiesel, also known as fatty acid alkyl ester, is a low-carbon fatty acid ester obtained by transesterification of animal and vegetable oils and low-carbon alcohols, generally fatty acid methyl ester. Biodiesel has the advantages of renewable, pollution-free, complete combustion, non-toxic and harmless, and its combustion performance is similar to that of traditional petroleum fuels. Biodi...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for the catalytic esterification of high-acid-value oil in view of the technical problems such as the generation of water in the esterification process of the existing high-acid-value oil and ester, which causes the poisoning of the solid acid catalyst and the short service life of the catalyst.