硅钨酸掺杂聚苯胺催化剂催化合成苹果酯-B  

Synthesis of fraistone by using H_4SiW_(12)O_(40)/PAn as catalyst

作　　者：王冬明[1] 杜心贤[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：《化工科技》2004年第4期8-10,共3页Science & Technology in Chemical Industry

基　　金：湖北省教育厅重点科研基金资助项目(2002A00008)。

摘　　要：以硅钨酸(H4SiW12O40)掺杂聚苯胺(PAn)H4SiW12O40/PAn为催化剂,以乙酰乙酸乙酯和1,2 丙二醇为原料合成苹果酯 B,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(1,2 丙二醇)=1∶1.6,催化剂用量为反应物料总质量的0.75%,环己烷为带水剂,反应时间1.0h。上述条件下,苹果酯 B的收率为75.7%。A new environmental friendly catalyst,H_4SiW_(12)O_(40)/PAn was prepared.Fraistone (Ⅰ) was synthesized from ethyl acetoacetate (Ⅱ) and 1,2-propylene glycol (Ⅲ) in the presence of H_4SiW_(12)O_(40)/PAn (Ⅳ).Factors affecting the product yield were discussed and best reaction conditions were found.Experimental result shows that Ⅳ is an excellent catalyst.With n(Ⅱ)∶n(Ⅲ) =1.0∶1.6,w(Ⅳ) =0.75%,and reaction time=1.0 h,yield of Ⅰ can reach 75.7%.

关 键 词：硅钨酸掺杂聚苯胺 催化剂 合成 苹果酯-B 乙酰乙酸乙酯 l 2-丙二醇 环己烷 乙酰乙酸乙酯l 2-丙二醇缩酮 合成香料 

分 类 号：TQ655[化学工程—精细化工] TQ224.4