硅胶负载磷钨酸催化合成苯甲醛乙二醇缩醛  

Catalytic synthesis of benzaldehyde glycol acetal with H_3PW_(12)O_(40)/SG

作　　者：杨水金[1] 吴君[1] 杨才峰[1] 

机构地区：[1]湖北师范学院化学与环境工程学院,湖北黄石435002

出　　处：《精细与专用化学品》2010年第5期45-47,共3页Fine and Specialty Chemicals

基　　金：湖北省自然科学基金资助项目(2005ABA053)

摘　　要：报道了以硅胶负载磷钨酸(H_3PW_(12)O_(40))/SG为催化剂,将苯甲醛和乙二醇反应合成苯甲醛乙二醇缩醛;探讨了H_3PW_(12)O_(40)/SG对缩醛反应的催化活性,较系统地研究了醇醛物质的量比、催化剂用量、反应时间、带水剂用量对产物收率的影响。通过正交实验优选反应条件:在n(苯甲醛):n(乙二醇)=1:1.6,m(催化剂):m(反应物料总量)=0.5%,带水剂环己烷8mL,反应时间30min的优化条件下,苯甲醛乙二醇缩醛的收率可达到74.9%。Benzaldehyde glycol acetal was synthesized from benzaldehyde and glycol,using phosphotungstic acid supported on silica gel（H_3PW_（12）O_（40）/SG） as catalyst.The factors influencing the synthesis were discussed and the best conditions were found out by orthogonal experiment.The optimum conditions were as follow：molar ratio of benzaldehyde to glycol is 1-1.6,the quantity of catalyst is equal to 0.5%of feed stocks,the volume of cyclohexane as the water-carrying agent is 8mL,and the reaction time is 30 min.H_3PW_（12）O_（40）/SG is an excellent catalyst for synthesizing benzaldehyde glycol acetal and its yield can be up to 74.9%.

关 键 词：苯甲醛乙二醇缩醛 磷钨酸 硅胶 催化 

分 类 号：TQ244.1[化学工程—有机化工]