Method for preparing biological diesel oil with methyl acetate act acyl acceptor

Abstract

The invention relates to a preparation method of biodiesel which takes methyl acetate as acyl receptor. The preparation method is characterized in that methyl acetate is taken as acyl receptor, immobilized lipase Novozym 435 is used to catalyze various types of vegetable oil, the reactions are performed under the conditions that the mole ratio between the methyl acetate and the vegetable oil is (12 to 16):1, the addition level of the Novozym 435 enzyme is 30 percent of the vegetable oil, the reaction temperature is 40 DEG C and the reaction time lasts for 10 to 14 hours, however, the methyl acetate is adopted to synthesize the biodiesel, the by-product of the reaction is glyceryl triacetate, which has no obvious negative impact on the catalytic activity of lipase, therefore, the lipase can be directly reclaimed without any treatment. The methyl ester yield of the biodiesel prepared through catalyzing refined soybean oil is 91 percent. According to the actual condition of China, cottonseed oil, colza oil and tea oil which are more appropriate for the national conditions of China are selected to study, and the methyl ester yield all reaches more than 90 percent, wherein, the methyl ester yield of the biodiesel prepared through catalyzing refined cottonseed oil reaches 97 percent.

Description

technical field [0001] The invention relates to biodiesel, in particular to a method for preparing biodiesel by using methyl acetate instead of methanol as an acyl acceptor for enzymatic transesterification. Background technique [0002] With the continuous reduction of oil reserves, the continuous increase of energy demand, and the environmental pollution caused by fossil fuels, the development of new, environmentally friendly, non-petroleum renewable energy is the main idea of ​​future energy development. After the oil crisis in the 1970s, people began to study the gasification and liquefaction of coal. However, complicated technology and huge investment restricted the widespread use of gasified coal and liquefied coal. And nuclear energy has not been applied on a scale due to safety reasons. Biomass energy, solar energy and other renewable energy sources will replace oil and coal and gradually become the protagonists of world energy. Biodiesel is renewable, environmenta...

AI Technical Summary

Problems solved by technology

After the oil crisis in the 1970s, people began to study the gasification and liquefaction of coal. However, complex technology and huge investment restricted the widespread use of gasified coal and liquefied coal.

At present, the conversion rate of lipase to short-chain alcohols is low, which is not as effective as the esterification or transesterification of long-chain alcohols, and short-chain alcohols have certain toxicity to enzymes, which shortens the service life of enzymes

Lipase is expensive and the production cost is high, which limits its application in the production of biodiesel on an industrial scale

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