硅钨酸掺杂聚苯胺催化剂催化合成环己酮乙二醇缩酮

Catalytic synthesis of cyclohexanone ethylene ketal with H 4 SiW 12 O 40 /PAn

采用回流法制备了硅钨酸(H4SiW12O40)掺杂聚苯胺(PAn)催化剂H4SiW12O40/PAn。通过环己酮和乙二醇为原料合成环己酮乙二醇缩酮 ,探讨了硅钨酸掺杂聚苯胺催化剂对缩酮反应的催化活性 ,较系统地研究了原料量比、催化剂用量、反应时间诸因素对产品收率的影响。实验表明 :在n(环己酮)∶n(乙二醇)=1∶1 4 ,催化剂用量为反应物料总质量的0 8 % ,环己烷为带水剂 ,反应时间40min的优化条件下 ,环己酮乙二醇缩酮的收率可达91 2 %。

A new environmental friendly catalyst,H 4 SiW 12 O 40 /PAn was prepared.Cyclohexanone ethylene ketal was synthesized from cyclohexanone and ethylene glycol in the presence of H 4 SiW 12 O 40 /PAn.The factors influencing the synthesis were discussed and the optimum conditions were found out.The optimum conditions are:molar ratio of cyclohexanone to ethylene glycol is1∶1.4,catalyst content is equal to0.8%feed stock,and the reaction time is40min.H 4 SiW 12 O 40 /PAn is an excellent catalyst for synthesizing cyclohexanone ethylene ketal and its yield can reach over91.2%.