分子筛吸附脱水合成乳酸乙酯工艺及动力学研究  

Study on Process and Kinetics of Ethyl Lactate Synthesized by Adsorption Dehydration with Zeolite Adsorbent

作　　者：王海东[1] 丁斌[1] 郝凤岭[1] 关昶[1] 李祥[1] 刘群[1] 张卫华[1] 

机构地区：[1]吉林化工学院石油化工学院,吉林吉林132022

出　　处：《化学世界》2016年第10期631-634,共4页Chemical World

摘　　要：以阳离子交换树脂(NKC-9)为催化剂,乳酸和乙醇为原料,采用0.4nm分子筛吸附脱水技术合成乳酸乙酯。考察了n(乙醇)∶n(乳酸)、NKC-9用量和反应时间等因素对反应的影响,确定最佳酯化反应工艺条件为:n(乙醇)∶n(乳酸)=1.2∶1、w(NKC-9)=5%(以乙醇和乳酸总质量计),回流温度,反应时间4.0h;在该条件下乳酸的转化率达到97.9%。催化剂重复使用4次后,乳酸的转化率仍可达到90%以上。研究了反应动力学,确定反应级数为二级,表观活化能为52.94kJ/mol。Synthesis of ethyl lactate from lactic acid and ethanol catalyzed by cation exchange resin（NKC-9）was studied under adsorption dehydration with 0.4nm molecular sieve.The effects of different reaction conditions such as n（ethanol）∶n（lactic acid）,amount of NKC-9and reaction time were studied.The results showed that the optimum esterfication process conditions were as follows：n（ethanol）∶n（lactic acid）=1.2∶1[w（NKC-9）=5%]（total weight of ethanol and lactic acid）,under reflux conditon and reaction time of 4.0h.Under the above conditions,the conversion rate of lactic acid was up to 97.9%.The conversion rate of lactic acid was still over 90%,after the catalyst being used for 4times.The results showed that the synthesis of ethyl lactate was a second-order reaction,and the apparent activation energy was 52.94kJ/mol.

关 键 词：乳酸乙酯 分子筛 吸附脱水 动力学 

分 类 号：TQ655[化学工程—精细化工]