硅钨酸掺杂聚苯胺催化剂催化合成苹果酯  

Synthesis of 2-methyl-2-ethyl acetoacetate-1,3-dioxolane by using H_4SiW_(12)O_(40)/PAn as Catalyst

作　　者：白爱民[1] 杜心贤[1] 吕宝兰[1] 杨水金[1] 

机构地区：[1]湖北师范学院化学与环境工程系,湖北黄石435002

出　　处：《商丘师范学院学报》2005年第2期110-112,共3页Journal of Shangqiu Normal University

基　　金：湖北省教育厅重点科研基金(No.2002A00008)资助项目

摘　　要：自制了硅钨酸(H4SiW12O40)掺杂聚苯胺(PAn)催化剂H4SiW12O40/PAn.以乙酰乙酸乙酯和乙二醇为原料合成苹果酯,较系统地研究了原料摩尔比、催化剂用量、反应时间诸因素对产品收率的影响.实验表明:最佳反应条件为n(乙酰乙酸乙酯)∶n(乙二醇)=1∶1 5,催化剂用量为反应物料总质量的0 5%,环己烷为带水剂,反应时间1 0h.上述条件下,苹果酯的收率为71 5%.A new environmental friendly catalyst,H_4SiW_(12)O_(40)/PAn was prepared.2-Methyl-2-ethyl acetoacetate-1,3-dioxolane(Ⅰ)was synthesized from ethyl acetoacetate (Ⅱ) and ethylene glycol (Ⅲ) in the presence of H_4SiW_(12)O_(40)/PAn(Ⅳ).Factors influencing the product yield were discussed and best reaction conditions were found.Experimental result showed that Ⅳ is an excellent catalyst.With n(Ⅱ)∶n(Ⅲ)=1.0∶1.5,w(Ⅳ)=0.5%,and reaction time=1.0 h,yield of I can reach 71.5%.

关 键 词：苹果酯 硅钨酸 聚苯胺 催化 

分 类 号：TQ655[化学工程—精细化工] TQ426.91