硅胶负载硅钨酸催化合成苯甲醛1,2-丙二醇缩醛  

Catalytic Synthesis of Benzaldehyde 1,2-Propanediol Acetal with H_4SiW_(12)O_(40)/SG

作　　者：杨水金[1] 王东锋[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》2011年第12期51-54,共4页

摘　　要：以硅胶负载硅钨酸为催化剂,通过苯甲醛与1,2-丙二醇反应合成了苯甲醛1,2-丙二醇缩醛。较系统地研究了醛醇量比、催化剂用量、带水剂用量及反应时间等条件对收率的影响。结果表明:固定苯甲醛用量为0.20mol,在n(苯甲醛)∶n(1,2-丙二醇)=1:1.4,催化剂用量为0.25g,环己烷为带水剂用量为10mL,反应时间60min的优化条件下,苯甲醛1,2-丙二醇缩醛的收率可达77.4%。Benzaldehyde 1,2-propanediol acetal was synthesized from benzaldehyde and 1,2-propanediol in the presence of H4SiW12O40/silica gel as catalyst.The factors influencing the synthesis were discussed and the best reaction conditions were found out.Experimental results showed that H4SiW12O40/ silica gel was an excellent catalyst.The optimum conditions were:molar ratio of butanone to 1,2-propanediol is 1:1.4,the mass of catalyst used to the reactants is 0.25g(based on 0.20 mol benzaldehyde) ,cyclohexane as deaquation agent 10mL,and the reaction time is 60min.the yield of its can reach 77.4 %.

关 键 词：苯甲醛1 2-丙二醇缩醛 硅胶负载硅钨酸 催化 

分 类 号：TQ2[化学工程—有机化工]