SO_4^(2-)/TiO_2-La_2O_3催化合成苯甲醛乙二醇缩醛  

Catalytic Synthesis of Benzaldehyde Glycol Acetal with SO_4^(2-) / TiO_2 -La_2O_3

作　　者：杨水金[1] 夏佳[1] 杨小山[1] 白爱民[1] 

机构地区：[1]湖北师范学院化学与环境工程系,黄石435002

出　　处：《化学推进剂与高分子材料》2004年第2期39-41,共3页Chemical Propellants & Polymeric Materials

基　　金：湖北省教育厅重点科研基金 (No .2 0 0 2A0 0 0 0 8)资助项目

摘　　要：以稀土改性固体超强酸SO42 -/TiO2 La2 O3 为催化剂 ,通过苯甲醛和乙二醇反应合成苯甲醛乙二醇缩醛 ,探讨了SO42 -/TiO2 La2 O3 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、反应时间诸因素对产品收率的影响。实验表明 :SO42 -/TiO2 La2 O3 是合成苯甲醛乙二醇缩醛的良好催化剂 ,在n(醇 )∶n(醛 ) =2 .0∶ 1,催化剂用量为反应物料总质量的 0 .5 % ,环己烷为带水剂 ,反应时间 5 0min的优化条件下 ,苯甲醛乙二醇缩醛收率可达 90 %。The benzaldehyde glycol acetal was synthesized by the reaction of benzaldehyde and glycol with the solid superacid SO 4 2-/TiO 2-La 2O 3 modified with the rare earth materials as a catalyst. The catalytic activity of the SO 4 2-/TiO 2-La 2O 3 to acetalation reaction was discussed. The influence of the factors of molar ratio of glycol to aldehyde, the quantity of catalyst and the reaction time on the product yield was more systematically studied. The experimental results show that the SO 4 2-/TiO 2 -La 2O 3 is an excellent catalyst to synthesis of the benzaldehyde glycol acetal. When the molar ratio of the glycol to the aldehyde is 2.0:1.0, the content of the catalyst is equal to 0.5% by the mass of the total reaction stocks, the cyclohexane is used as water entraining agent and the reaction time is 50 min, the yield can reach 90%.

关 键 词：SO4^2-/TIO2-LA2O3 苯甲醛乙二醇缩醛 稀土 改性 固体超强酸 催化剂 缩醛反应 香料 香精 

分 类 号：O625.3[理学—有机化学]