固体超强酸SO_4^(2-)/ZrO_2催化合成环己酮乙二醇缩酮

Catalytic synthesis of cyclohexanone ethylene ketal with solid superacid SO_4^(2-)/ZrO_2

制备了固体超强酸催化剂SO42-/ZrO2,并利用该催化剂催化合成了环己酮乙二醇缩酮.探讨了SO42-/ZrO2对缩酮反应的催化活性,并系统地研究了醇酮物质的量比,反应时间,带水剂用量,催化剂用量等因素对产品收率的影响.实验结果表明:SO42-/ZrO2是合成环己酮乙二醇缩酮的良好催化剂,在n(环己酮)∶n(乙二醇)=1∶1.5,环己酮物质的量为0.2 mol,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60 min的优化条件下,环己酮乙二醇缩酮的收率可达84.7%。

The solid superacid SO4^2-/ZrO2 catalyst was prepared and used for the synthesis of eyelohexanone ethylene ketal by ketalization. The effect of molar ratio of cyclohexanone to ethylene glycol, reaction time, catalyst amount, amount of the water-entraining agent and calcination temperature on the ketalization reacation had been investigated. The optimum conditions are as follows, molar ratio of cyclohexanone to ethylene glycol is 1 ： 1.5, the quantity of catalyst is equal to 0.5 % feed stock,cyclohexane as water-entraining agent,reaction time is 60min, solid superacid SO4^2-/ZrO2 is a good catalyst for synthesizing cyclohexanone ethylene ketal and its yied can reach 84.7%.