硅钨酸催化合成苹果酯-B  

Synthesis of Ethyl Acetoacetate 1,2- Propylene Glycol Ketal over Silicotungstic Acid

作　　者：罗玉梅[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

出　　处：《化工生产与技术》2005年第3期14-15,共2页Chemical Production and Technology

基　　金：湖北师范学院科研基金2003B22;重点学科基金资助项目。

摘　　要：探讨了硅钨酸对苹果酯-B合成反应的催化活性,研究了带水剂用量、催化剂用量、乙酰乙酸乙酯与1,2-丙二醇量的比、反应时间等因素对产品收率的影响。实验表明:硅钨酸是合成苹果酯-B的优良催化剂,在n(乙酰乙酸乙酯):n(1,2-丙二醇)=1:1.5,催化剂质量为反应物总质量的0.5%,环己烷作带水剂,反应时间为1.0h的优化条件下,苹果酯-B的收率可达91.8%。Ethyl acetoacetate 1, 2 - propylene glycol ketal was synthesized from ethyl acetoacetate and 1, 2 - propylene glycol in the presence of silicotungstic acid. Influencing factors were discussed and the best conditions were found out. The optimum conditions are: molar ratio of ethyl acetoacetate to 1, 2 - propylene glycol is 1: 1.5, the quantity of catalyst is equal to 1. 5% of feed stocks, and the reaction time is 1. 0 h. Silicotungstic acid is an excellent catalyst for synthesizing ethyl acetoacetate 1,2-propylene glycol ketal and its yield can reach over 91. 8% .

关 键 词：苹果酯-B 硅钨酸 催化合成 乙酰乙酸乙酯 反应时间 催化剂用量 催化活性 合成反应 产品收率 优化条件 带水剂 丙二醇 总质量 反应物 环己烷 

分 类 号：TQ655[化学工程—精细化工] TQ225.241