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In this paper, the use of the soapstock development process of the preparation of fatty acid esters studied successfully by acidification and bleaching pretreatment transformed into a bright color, bleached oil soapstock and further design optimization immobilized lipase - catalyzed decolorization oil diethyl carbonate process for preparation of fatty acid ethyl ester . Wherein the raw soapstock pretreatment product bleached oil yields of up to 44.31% ; to 5% wt , and in the solvent-free systems , the immobilized lipase Novozym435 as catalyst , in a molar ratio of 3:1 carbonate with diethyl decolorization oil as a reaction substrate shaker at 180 rpm at a temperature of 50 ° C , the reaction time of 24 h , fatty acid ethyl esters yield 98.4 % ; immobilized enzyme without any treatment directly reused 10 batches , fatty acids, b The ester yield remains as high as 97.35% . In addition , studies have shown that fatty acid ethyl esters good performance of the resulting product , suitable for the preparation of environmental development ester-based lubricants and industrial solvents and other chemical products . Meanwhile, the use of fatty acid esters of diethanolamine slightly to Koh post-treatment can also be generated with good lubricity and detergency alkanolamide , can be used as displacing agent , or industrial detergents . Fatty acid ethyl esters of the process after the two-step method of pretreatment and enzymatic catalysis prepare excellent performance , stable source of raw materials , low-cost , easily separated from the product , the process is simple ; acyl acceptor diethyl carbonate and immobilized enzyme catalyst Novozym 435 on the reaction the bleached oil substrate applicability , thus avoiding the toxic effects of traditional acyl receptor and its byproducts lipase . The process control raw material costs , improve repeat stability of the immobilized enzyme , thereby reducing the economic cost of the Enzymatic Preparation , and the prospects for industrial applications .
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