Preparation method of low-solidifying point biodiesel

Abstract

The invention discloses a preparation method of low-solidifying point biodiesel, wherein a method for synthesizing isostearic acid ester has the advantages of simplicity, high yield, mild condition, low cost, easy industrialization and obvious condensation-reducing effect on the biodiesel. In the method, the isostearic acid ester is prepared by mainly subjecting the isostearic acid and low-carbon alcohol to esterification and then adding the isostearic acid ester to the biodiesel to destroy the regularity of the biodiesel so that the biodiesel is not easy to crystallize and separate out at low temperature, thereby the low-temperature flowing performance of the biodiesel is improved. The preparation method of the low-solidifying point biodiesel comprises the following steps of: (A) adding the isostearic acid and alcohol to a reactor by a certain proportion, then adding a catalyst with the mass fraction of 5%-20%, and reacting for 6-20 hours at the temperature of 65-85 DEG C to obtain the isostearic acid ester; and (B) then adding the isostearic acid ester to the biodiesel, and uniformly stirring to obtain the low-solidifying point biodiesel.

Description

technical field [0001] The invention relates to a method for preparing biodiesel, more particularly to a method for preparing biodiesel with a low freezing point. Background technique [0002] After the outbreak of the oil crisis in 1973, many experts believed that the usable life of the world's oil reserves would be less than 50 years, so attention must be paid to the development and utilization of renewable energy. In 1983, the United States began the research on biodiesel, and then in Austria, Germany, and New Zealand, the research on biodiesel was carried out successively. Since then, biodiesel has attracted the attention of the whole world. Biodiesel is a mixture of fatty acid esters, such as fatty acid methyl ester, fatty acid ethyl ester, fatty acid propyl ester, etc., obtained by transesterification of animal and vegetable oils and low molecular weight alcohols (such as methanol, ethanol, etc.). It is an environmentally friendly fuel. Compared with traditional miner...

AI Technical Summary

Problems solved by technology

EP543356 describes a composition for the production of improved low-temperature performance, which can be used as a power fuel or as a lubricating oil based on rapeseed oil methyl ester, which can reduce the plugging point of cold filters to -15 ° C to -20 ° C; However, in the existing methods, the cost of additives is high and the preparation method is complicated. Therefore, it is necessary to develop a method for the preparation of biodiesel additives that is simple, high in yield, mild in conditions, low in cost, easy to industrialize, and has a significant pour point depressing effect on biodiesel. Method and its application