Catalytic Synthesis of Cyclohexanone Ethylene Ketal by Rare Earth Solid Superacid SO_4~(2-)/TiO_2-La_2O_3

The catalystic rare earth solid superacid SO_4~(2-)/TiO_2-La_2O_3 was prepared. Cyclohexanone ethylene ketal was synthesized from cyclohexanone and ethylene glycol in the presence of rare earth solid superacid SO_4~(2-)/TiO_2-La_2O_3. The factors influencing the synthetic processes were discussed and the best conditions were found out. The optimum conditions are: molar ratio of cyclohexanone to ethylene glycol is 1∶1.5, the quantity of catalyst is equal to 0.5% feed stock, the reaction temperature is 90～120 oC, and the reaction time is 1.5 h. It was found that the yield can reach over 84.3%. Rare earth solid superacid SO_4~(2-)/TiO_2-La_2O_3 might be a good kind of catalysts for synthesizing cyclohexanone ethylene ketal.