硅胶负载硅钨酸催化合成2,4-滴丁酯  

Catalytic synthesis of 2,4-D butylate with H4SiW_(12)O_(40)/silica gel

作　　者：杨水金[1] 王伟平[1] 谭向恩[1] 

机构地区：[1]湖北师范学院化学与环境工程学院污染物分析与资源化技术湖北省重点实验室,湖北黄石435002

出　　处：《化学试剂》2011年第6期555-557,563,共4页Chemical Reagents

基　　金：湖北省自然科学基金资助项目(2005ABA053);污染物分析与资源化技术湖北省重点实验室基金资助项目(KY2010G13)

摘　　要：以硅胶负载硅钨酸为催化剂(H4SiW12O40/SG),2,4-二氯苯氧乙酸和正丁醇为原料合成2,4-滴丁酯。探讨H4SiW12O40/SG对酯化反应的催化活性,较系统地研究了酸醇物质的量比、催化剂用量、反应时间等因素对产物收率的影响。实验表明:H4S iW12O40/SG是合成2,4-滴丁酯的良好催化剂,固定2,4-二氯苯氧乙酸用量为0.04 mol,在n(2,4-二氯苯氧乙酸)∶n(正丁醇)=1∶4,催化剂用量为0.15 g,带水剂环己烷为8 mL,反应时间2.0 h的适宜条件下,2,4-滴丁酯的收率可达77.8%。2,4-D butylate was synthesized from 2,4-dichlorophenoxyacetic acid and butanol with H4SiW12O40/silica gel as catalyst.The effects of molar ratio of alcohol to acid,reaction time and amount of catalyst on product yield were investigated.The optimum conditions were as follows：molar ratio of alcohol to acid,4∶1;reflux reaction time,2.0 h;and catalyst amount,0.15 g（based on 0.04 mol 2,4-dichlorophenoxyacetic acid）,the volume of cyclohexane as the water-carrying agent,8 mL.The yield of 2,4-D butylate could reach 77.8%.

关 键 词：2 4-滴丁酯 硅钨酸 硅胶 催化 

分 类 号：TQ426.91[化学工程] TQ655