二氧化硅负载硅钨钼酸催化合成苯甲醛缩醛  

Catalytic synthesis of Benzaldehyde Acetal with H_4SiW_6Mo_6O_(40)/SiO_2

作　　者：吕宝兰[1] 洪雨[1] 石锦红[1] 杨水金[1] 

机构地区：[1]湖北师范学院化学与环境工程学院,黄石435002

出　　处：《化工中间体》2012年第12期25-29,共5页

摘　　要：采用溶胶-凝胶法制备了二氧化硅负载硅钨钼酸催化剂,并以其为催化剂,通过苯甲醛分别与乙二醇、1,2-丙二醇合成了苯甲醛缩醛,较系统地研究了醛醇物质的量比、催化剂用量、带水剂环己烷用量和反应时间诸因素对产品收率的影响。实验表明,二氧化硅负载硅钨钼酸催化剂是合成苯甲醛缩醛的良好催化剂,在n(苯甲醛):n(乙二醇)=1:12,n(苯甲醛):n(1,2-丙二醇)=1:1.4,催化剂用量为原料总质量的0.6%,环己烷作带水剂8mL,反应时间60min的优化条件下,苯甲醛乙二醇缩醛的收率可达833%,苯甲醛1,2-丙二醇缩醛的收率可达88.2%。A new environmental friendly catalyst,H4SiW6Mo6O40/SiO2 was prepared by the method of Sol-gel.H4SiW6Mo6O40/ SiO_2 was used as the catalyst in the synthesis of Benzaldehyde Acetal.The factors influencing the synthesis were discussed and the best conditions were found out.The optimum conditions are:molar ratio of benzaldehyde to glycol is 1:1.2,molar ratio of benzaldehyde to 1,2-propanediol is 1:1.4 mass fraction of catalyst to reactants is 0.6%,the volume of cyclohexane as the water-carrying agent is 8 mL,and the reaction time is 60min.Under these conditions,the yield of Benzaldehyde Glycol Acetal was 83.3%.the yield of Benzaldehyde 1,2- propanediol acetal was 88.2%.

关 键 词：苯甲醛缩醛 二氧化硅负载硅钨钼酸 催化 

分 类 号：O643.32[理学—物理化学]