Patent ID: 7550278

Claim:
A process for producing biodiesel from renewable oil under lipase catalysis in an organic medium reaction system, wherein a short chain alcohol ROH, wherein R is an alkyl group having 1 to 5 carbon atoms, is used as an acyl acceptor, tert-butanol is used as a reaction medium, and a renewable oil raw material is catalyzed by a lipase to synthesize biodiesel through a transesterification reaction, characterized in that: the short chain alcohol and the renewable oil raw material having an alcohol/renewable oil molar ratio of 3:1 to 6:1, together with 20-200% by volume of the tert-butanol based on the volume of the renewable oil, and 2-30% by weight of the lipase based on the weight of the renewable oil are added into an enzyme reactor and mixed evenly, the mixture is then heated to 20-60° C. to react for 4-24 hours to convert the renewable oil raw material into biodiesel and byproduct glycerin.