Research Progress in Cyclohexene Preparation by Cyclohexanol Catalytic Dehydration

Cyclohexene is a widely used organic compound.A study on catalysts for synthesis of cyclohexene has great influence on cyclohexene production.The preparation methods of cyclohexene by catalytic dehydration of cyclohexanol using p-toluenesulfonic acid,benzenesulfonic acid,methanesulfonic acid,solid supported methanesulfonic acid,strongly acidic cationic exchange resin,ferric chloride hexahydrate,stannic chloride pentahydrate,stannous chloride dihydrate,aluminum chloride,aluminum silicate,activated carbon supported elementary iodine,zirconium sulfate,Ti4+-cationic exchange resin,sodium bisulfate monohydrate,potassium bisulfate,solid super acid,heteropoly acid,molecular sieve,ionic liquid,and so on as catalyst respectively are reviewed.It is pointed out that the solid super acid,heteropoly acid and molecular sieve are excellent catalysts for preparing cyclohexene by dehydration of cyclohexanol.