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Bio diesel oil preparation technique using enzyme method of membrane on-line dehydration

A technology for biodiesel and enzymatic preparation, which is used in the preparation of liquid hydrocarbon mixtures, petroleum industry, biological raw materials, etc., to achieve the effect of improving the efficiency of enzymatic reactions

Active Publication Date: 2009-02-04
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a process for preparing biodiesel by using membrane online dehydration enzymatic method, which solves the problem of how to realize online dehydration to improve the yield of biodiesel and prolong the production of biodiesel when biodiesel is prepared from high-acid value and low-quality oils and fats. The problem of operational stability of the

Method used

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  • Bio diesel oil preparation technique using enzyme method of membrane on-line dehydration

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Effect test

Embodiment 1

[0014] The airlift loop reactor is equipped with methanol and rapeseed acidified oil (acid value of 120) in a molar ratio of 4:1, and 60% tert-butanol based on the volume of the fat. The temperature is controlled at 50°C. Immobilized lipase Lipozyme TL with 3% mass and Novozym 435 with 2% oil mass. The volatile gas tert-butanol and methanol are used as the circulation force of the liquid in the reactor to entrain the water generated in real time during the reaction. Pass through a ceramic membrane that can selectively permeate water, and then return to the enzyme reactor, and so on. After passing through the membrane, the water permeability can reach 90%, and the permeability of tert-butanol and methanol is 5%. After 5 hours of reaction, the yield of biodiesel reached more than 90%.

Embodiment 2

[0016] The airlift loop reactor is equipped with 5:1 molar ratio of ethanol and soybean acidified oil (acid value of 60), and 80% tert-butanol based on the volume of fat. The temperature is controlled at 50°C. 3% immobilized lipase Lipozyme TL and 2% immobilized lipase Novozym 435 based on the mass of oil. The volatile gas tert-butanol and methanol are used as the circulation force of the liquid in the reactor to entrain the water generated in real time during the reaction. A ceramic membrane that can selectively permeate water, and then return to the enzyme reactor, and so on. After passing through the membrane, the water permeability can reach 92%, and the permeability of tert-butanol and ethanol is 1%. After 6 hours of reaction, the yield of biodiesel reached more than 90%.

Embodiment 3

[0018] The airlift loop reactor is equipped with 6:1 molar ratio of propanol and soybean acidified oil (acid value of 100), and 60% tert-butanol based on the volume of fat. The temperature is controlled at 50℃. 3% immobilized lipase Lipozyme TL and 2% immobilized lipase Novozym 435 based on the mass of oil. The volatile gas tert-butanol and methanol are used as the circulation force of the liquid in the reactor to entrain the water generated in real time during the reaction. An organic membrane that can selectively permeate water, and then return to the enzyme reactor, and so on. After passing through the membrane, the water permeability can reach 98%, and tert-butanol and propanol are almost impermeable. After 5 hours of reaction, the yield of biodiesel reached more than 90%.

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Abstract

A process for preparing biodiesel by utilizing the enzymatic method of membrane online dehydration belongs to the field of biological and chemical synthesis. During the reaction of preparing the biodiesel by enzymatic grease with tertiary butyl alcohol as the reaction medium, volatilizable gases in the reaction system are directly used as the circulation dynamic force of the liquid in a reactor; the by-product water produced during the reaction is carried out from the enzyme reactor by the volatilizable gas and passes through a water-permselective membrane device so as to realize the online separation of the by-product water; the volatilizable gases such as the tertiary butyl alcohol and short chain alcohol still return to the enzyme reactor after passing through the membrane device and the circulation continues. The transmission of the membrane to water is more than 90 percent; the transmission of the membrane to the tertiary butyl alcohol is below 5 percent. The process for preparing biodiesel by utilizing the enzymatic method of membrane online dehydration has the advantage that the enzymatic reaction efficiency as well as the yield of the biodiesel are greatly improved, and is significant for the continuous production of preparing the biodiesel by the industrial enzymatic method.

Description

Technical field [0001] The invention belongs to the field of biochemical synthesis, and in particular relates to a process for preparing biodiesel by using an enzymatic method for membrane online dehydration, using tert-butanol as a reaction medium, and preparing biodiesel by using enzymatic oil for online dehydration of membranes. Background technique [0002] Biodiesel is a long-chain fatty acid ester substance produced by transesterification of bio-oil raw materials. It is a new type of non-polluting renewable energy, called biodiesel. Its combustion performance is comparable to traditional petroleum-based diesel. At present, the research and application of biodiesel has received extensive attention. At present, biodiesel is mainly produced by chemical methods, that is, animal and vegetable oils and some lower alcohols (methanol or ethanol) are transesterified under the action of alkali or acid catalysts to generate corresponding fatty acid methyl or ethyl esters. The chemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/64C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 刘德华杜伟
Owner TSINGHUA UNIV
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