酸性离子液体催化月桂酸制备生物柴油工艺的研究

以新型酸性离子液体1-丁基喹啉硫酸氢盐（[BQu]HSO4）为催化剂催化月桂酸与甲醇酯化反应制备生物柴油工艺研究，详细考察了离子液体用量、醇酸摩尔比、反应时间及反应温度等因素对月桂酸甲酯产率的影响。在单因素实验基础上利用响应面分析法优化月桂酸甲酯的最佳制备工艺条件为：离子液体用量为月桂酸质量的1.3%，甲醇与月桂酸摩尔比为2.8:1，反应时间3.2 h，反应温度373 K，此条件下生物柴油产率为96.3%，该结果与模型预测值基本相符。最佳条件下，制备月桂酸甲酯反应的活化能为25.25 kJ/mol，动力学方程为： 。

Catalytic Synthesis of Biodiesel from Lauric Acid using Acidic Ionic Liquid as Catalysts

Methyl laurate was synthesized by the esterification of lauric acid and methanol with acidic ionic liquid 1-butylquinoline bisulfate ([BQu]HSO4) as catalyst. The effects of amount of ionic liquid, alcohol/acid molar ratio, reaction time and reaction temperature were also investigated. On the basis of single factor experiment results, response surface analysis was used to obtain the optimal technology conditions for the preparation of biodiesel. Accordingly, the reaction conditions were optimized as follows: catalyst amount of 1.3% of lauric acid quality, molar ratio of methanol to lauric acid of 2.8:1, and reaction time of 3.2 h at a temperature of 373 K. The highest methyl laurate yield of 96.3% was reached, which was similar to the experimental result predicted by the mathematical model. Under optimized conditions, the active energy was 25.25 kJ/mol, and the kinetic equation can be expressed as .