Process for preparing biodiesel from renewable grease with lipase as catalyst and online dehydration
AssigneeTsinghua University
InventorsDehua Liu, Wei Du, Xuebing Zhao, Luole Zhu
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Abstract
Disclosed is a process for preparing biodiesel from renewable oil and fat catalyzed by lipase with online dehydration. The method uses a short chain alcohol ROH as an acyl-acceptor, and utilizes a lipase as the catalyst to catalyze transesterification reaction of oil and fat feedstock with said short chain alcohol, so as to synthesize biodiesel; and online dehydration with a membrane or a molecular sieve is carried out during the whole process or part of the reaction process. Such online dehydration process greatly simplifies the operation procedure, and provides good economic and environmental benefits.
Claims10
A process for preparing biodiesel from renewable oil and fat catalyzed by lipase with online dehydration, wherein a short chain alcohol ROH is used as an acyl-acceptor, and a lipase is utilized as the catalyst to catalyze transesterification reaction of oil and fat feedstock with said short chain alcohol, so as to synthesize biodiesel;
- the process is characterized in that, 4-8 mole of short chain alcohol based on the mass of oil and fat and 20-2000 active units of lipase based on the mass of oil and fat are added into single-stage or multi-stage reactor, and online dehydration with a membrane or a molecular sieve is carried out during the whole process or part of the reaction process;
- the temperature is maintained at 20-50° C.;
- after 3-10 hours' reaction, the yield for converting oil and fat feedstock into biodiesel is over 98%, and the acid value of the final biodiesel product is less than 0.5 mg KOH per gram of oil.
Dependencies are inferred from the claim text.