酯交换
单甘酯
脂肪酶
化学
甲醇
甘油二酯
有机化学
生物柴油
生物柴油生产
甘油三酯酶
催化作用
动力学
脂肪酸
酶
量子力学
物理
作者
Dang Hung Tran,Yi-Jan Lin,Ching-Lung Chen,Jo Shu Chang
标识
DOI:10.1016/j.biortech.2013.01.146
摘要
This work was carried out to investigate the acyl migration phenomena which has been considered as the factor having significant impact on kinetics of transesterification of oils catalyzed by a Burkholderia lipase with 1,3-regioselectivity. Transesterification of olive oil with methanol catalyzed by the immobilized lipase produces various intermediates, including 1-monoglyceride, 2-monoglyceride, 1,2-diglyceride, and 1,3-diglyceride. Migration kinetics of fatty acid groups from sn-2 of 2-monoglyceride and 1,2-diglyceride to 1-monoglyceride and 1,3-diglyceride were investigated for the temperature range of 25-65°C. The kinetics of transesterification of olive oil with methanol involving acyl migration in the presence of water was also systematically studied at 25, 40, and 65°C. Increasing temperature could increase the acyl migration rate. The overall biodiesel conversion was improved from 73.4% (at 25°C) to 90.0% and 92.4% when conducting at 40 and 65°C, respectively. Thermodynamics aspects of equilibrium state of the immobilized lipase-catalyzed transesterification were also discussed.
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