Method for biocatalyzing ester exchange reaction of high acid value lipid to produce biodiesel oil

Abstract

The invention relates to a process for preparing diesel fuel through biological catalyzed high acid value grease ester interchange which comprises, using alkaline substance such as trishydroxy methyl amino methane as addition agent, subjecting high acid value grease as raw material to ester exchange reaction with short-chain fatty acid ester at the presence of biological enzyme catalysis, separating the reaction product to obtain end product of biological diesel.

Description

Technical field [0001] The invention relates to an enzyme reaction technology, in particular to a method for biocatalyzing high acid value fats and oils to carry out a transesterification reaction to produce biodiesel. Background technique [0002] Biodiesel is a form of biomass energy. Its main component is long-chain fatty acid methyl esters. It is a renewable green energy produced from vegetable oils and animal fats. [0003] At present, the production of biodiesel in industry uses chemical methods, which require high raw materials, resulting in excessive production costs (raw material costs account for about 60-75% of the total cost). Whether biodiesel can be produced from cheap raw materials is the key to its widespread application. However, high acid value fats such as waste fats and oils in the catering industry are not suitable for chemical conversion processes. This is because a large amount of free fatty acids (acid value>5mgKOH / g) in the waste fats and oils will und...

AI Technical Summary

Problems solved by technology

During the reaction, methods such as adding methanol in batches and washing with an organic solvent to remove glycerin on the surface of the immobilized enzyme are required to improve the yield of methyl ester and the operational stability of the enzyme, which increases the cost and difficulty of control of the entire production process, which is not conducive to large-scale production. Scale production of biodiesel

In the disclosed technology, described in CN1436834A and CN1472280A, it is a kind of short-chain fatty acid ester as acyl acceptor, utilizes biological enzyme to catalyze bio-oil to carry out the method for transesterification reaction to produce biodiesel, this method uses refined oil as raw material , the existing problem is that the cost of raw materials is too high, which is not conducive to large-scale production

Described in CN1556174A, with high acid value animal and vegetable fats and oils as raw material, carry out esterification reaction with glycerol under the presence of strong acid catalyst, after esterification product is dehydrated, carry out transesterification reaction with methanol under strong base catalyst to produce biodiesel, although this technology Use cheap animal and vegetable oils with high acid value as raw materials, but the reaction temperature is high, the operation is complicated, and the use of strong acid catalysts and strong base catalysts leads to the generation of a large number of chemical pollutants