Continuous production of biodiesel fuel from vegetable oil using immobilized Candida antarctica lipase

作者：Yomi Watanabe, Yuji Shimada, Akio Sugihara, Hideo Noda, Hideki Fukuda, Yoshio Tominaga · 发表于：Journal of the American Oil Chemists Society · 年份：2000 · DOI：10.1007/s11746-000-0058-9 · 被引用次数：375 · 研究领域：Enzyme Catalysis and Immobilization、Biodiesel Production and Applications、Microbial Metabolic Engineering and Bioproduction

Abstract Candida antarctica lipase is inactivated in a mixture of vegetable oil and more than 1∶2 molar equivalent of methanol against the total fatty acids. We have revealed that the inactivation was eliminated by three successive additions of 1∶3 molar equivalent of methanol and have developed a three‐step methanolysis by which over 95% of the oil triacylglycerols (TAG) were converted to their corresponding methyl esters (ME). In this study, the lipase was not inactivated even though 2∶3 molar equivalent of methanol was present in a mixture of acylglycerols (AG) and 33% ME (AG/ME33). This finding led to a two‐step methanolysis of the oil TAG: The first‐step was conducted at 30°C for 12 h with shaking in a mixture of the oil, 1∶3 molar equivalent of methanol, and 4% immobilized lipase; the second‐step reaction was done for 24 h after adding 2∶3 molar equivalent of methanol (36 h in total). The two‐step methanolysis achieved more than 95% of conversion. When two‐step reaction was repeated by transferring the immobilized lipase to a fresh substrate mixture, the enzyme could be used 70 cycles (105 d) without any decrease in the conversion. From the viewpoint of the industrial production of biodiesel fuel production, the two‐step reaction was conducted using a reactor with impeller. However, the enzyme carrier was easily destroyed, and the lipase could be used only several times. Thus, we attempted flow reaction using a column packed with immobilized Candida lipase. Because the ...