硫酸根/氧化钛—氧化镧催化合成苯甲醛1,2—丙二醇缩醛  

Catalytic synthesis of benzaldehyde 1,2-propanediol acetal with SO_4^(2-)/TiO_2-La_2O_3

作　　者：夏佳[1] 杨小山[1] 吴顺红 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 [2]黄石三中,湖北黄石435002

出　　处：《化学工业与工程技术》2004年第1期3-5,共3页Journal of Chemical Industry & Engineering

基　　金：湖北省教育厅教研基金(2003263);湖北省教育厅重点科研基金(2002A00008)

摘　　要：以稀土改性固体超强酸SO_4^(2-)/TiO_2—La_2O_3为催化剂,通过苯甲醛和1,2—丙二醇反应合成了苯甲醛1,2—丙二醇缩醛,探讨了SO_4^(2-)/TiO_2—La_2O_3对缩醛反应的催化活性,研究了醛醇物质的量比、催化剂用量、反应时间等对产品收率的影响。实验表明,SO_4^(2-)/TiO_2—La_2O_3是合成苯甲醛1,2—丙二醇缩醛的良好催化剂,在n(醇):n(醛)=2.25:1,催化剂用量为反应物料总质量的0.50％,环己烷为带水剂,反应时间50min的优化条件下,苯甲醛1,2—丙二醇缩醛的收率可达80.8％。Benzaldehyde 1,2-propanediot acetal is synthesized from benzaldehyde and 1,2-propanediol in the presence of SO(2-)/4-/TiO_2-La_2 O_3. The catalytic activity of SO(2-)/4-/TiO_2-La_2 O_3 to the atdolisation is discussed. The influences of the factors such as the ratio of 1,2-propanediol to benzaldehyde, dosage of the catalyst and the reaction time etc on the product yield are studied. The optimum conditions are: molar ratio of 1,2-pro-panediol to benzaldehyde is 2.25:1, the dosage of the catalyst is equal to 0.50% of feed stocks, cyclohexane can be used as dehydrator, and the reaction time is 50 min. The yield of the product reaches 80. 8% under the optimum conditions.

关 键 词：苯甲醛1 2-丙二醇缩醛 硫酸根/氧化钛一氧化镧 催化 缩醛反应 

分 类 号：TQ24[化学工程—有机化工]