离子交换树脂催化合成乳酸乙酯动力学研究  

Kinetic of catalytic synthesis of ethyl lactate using ion exchange resin as catalyst

作　　者：李媚[1] 罗毅[2] 谢涛[1] 吴如春[1] 廖安平[1] 

机构地区：[1]广西民族大学化学化工学院,广西高校化学与生物转化过程新技术重点实验室,南宁530006 [2]广西南宁市人力资源和社会保障局,南宁530000

出　　处：《食品科技》2012年第12期259-263,共5页Food Science and Technology

基　　金：国家自然科学基金项目(21066002);广西自然科学基金项目(桂科能0992028-13);广西高校人才小高地建设创新团队项目(桂教人[2011]47)

摘　　要：在间歇釜式反应器中,研究D072强酸性离子交换树脂作催化剂合成乳酸乙酯的反应动力学。在消除内外扩散的条件下,测定了不同催化剂用量和不同反应温度条件下反应体系中乳酸浓度随反应时间的变化,按拟均相二级可逆反应,并采用初始反应速率法求取动力学模型参数。在催化剂与乳酸的质量比为1%～5%,温度为323.15～363.15K和常压的条件下,得到动力学方程的频率因子为967.56L/(mol·min),活化能为35606.55J/mol。在实验范围内对获得的动力学方程进行验证,计算值与实验值吻合较好。The reaction kinetics for the liquid phase synthesis of ethyl lactate over strong acid ion exchange resin （D072） catalyst was investigated in a stirred batch reactor. By elimination of internal and external diffusion, the concentration change of acetic acid with reaction time was determined and the parameters of the kinectic model were evaluated by the initial reaction rate method. The frequency factor was 967.59 L/（mol-min） and activated energy was 35606.55 J/mol under the conditions of 323.15-363.15 K mass ratio of catalyst to lactic acid 1%-5% and 101.3 kPa. The accuracy of the reaction kinetic equation was testified under the above experimental conditions and the results showed that the reaction rate calcualated values agreed with experimental values well.

关 键 词：强酸性离子交换树脂 乳酸乙酯 合成 动力学方程 

分 类 号：TS202.3[轻工技术与工程—食品科学]