游离脂肪酶NS81006催化油脂醇解制备生物柴油的酶促反应动力学

O643; 探究了游离脂肪酶NS81006催化油脂甲(乙)醇解制备生物柴油的反应历程,并对该体系进行了酶促反应动力学研究.结果表明,催化过程中油脂同时存在酯交换及先水解再酯化两种反应历程.在以甲醇或乙醇作为酰基受体的反应过程中,酯交换反应速率明显大于水解反应速率.进一步研究表明,油脂甲醇解反应速率常数大于乙醇解,揭示了以甲醇或乙醇为不同酰基受体时反应速率存在差异的主要原因在于乙醇解反应的酯交换过程较慢....

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Bibliographic Details
Published in催化学报 Vol. 33; no. 11; pp. 1857 - 1861
Main Author 吕亮亮 杜伟 刘德华
Format Journal Article
LanguageChinese
Published 清华大学化工系, 北京100084 2012
Subjects
反应动力学
水解反应
生物柴油
脂肪酶
酯交换反应
水解反应
脂肪酶
反应动力学
生物柴油
酯交换反应
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ISSN0253-9837
1872-2067
DOI10.3724/SP.J.1088.2012.20638

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Summary:O643; 探究了游离脂肪酶NS81006催化油脂甲(乙)醇解制备生物柴油的反应历程,并对该体系进行了酶促反应动力学研究.结果表明,催化过程中油脂同时存在酯交换及先水解再酯化两种反应历程.在以甲醇或乙醇作为酰基受体的反应过程中,酯交换反应速率明显大于水解反应速率.进一步研究表明,油脂甲醇解反应速率常数大于乙醇解,揭示了以甲醇或乙醇为不同酰基受体时反应速率存在差异的主要原因在于乙醇解反应的酯交换过程较慢.
Bibliography:Biodiesel production catalyzed by liquid lipase has been drawing more attention for its lower cost and faster reaction rate compared to immobilized lipase.The liquid lipase NS81006-catalyzed methanolysis and ethanolysis of soybean oil for biodiesel production were studied.A kinetic model was established by taking transesterification reactions,as well as hydrolysis and esterification reactions into consideration.The corresponding values of rate constants were then obtained for all forward and reverse reactions based on the model.The results show that the transesterification reaction rates are obviously higher than the hydrolysis reaction rates either with methanol or ethanol as the acyl acceptor.Further study indicates that the rate constants of ethanolysis are smaller than that of methanoslysis,which results in the difference in reaction rate between methanolysis and ethanolysis.
21-1195/O6
Lü Liangliang,DU Weia,LIU Dehuab Department of Chemical Engineering,Tsinghua University,Beijing100084,China
lipase; biodies
ISSN:0253-9837
1872-2067
DOI:10.3724/SP.J.1088.2012.20638