Synthesis of cyclohexyl acetate by the solid superacid S_2O_8~(2-)/Fe_2O_3-MoO_3 catalyst

Fe(NO-3)-3 and(NH-4)-6Mo-7O-(24) were used as the raw material and citric acid as complexant to prepare solid superacid S-2O-8~(2-)/Fe-2O-3-MoO-3 by sol-gel method.The influence factors of catalyst activity were investigated by the esterification,i.e.probe reaction of acetic acid and cyclohexanol.The optimal condition of preparation of the catalyst were obtained as follows: impregnation concentration was 0.5 mol/L,calcination temperature was 350 ℃ and calcination time was 3.5 h.The cyclohexyl acetate were synthesized by the catalyst prepared under above conditions.The best conditions were obtained by the orthogonal test as follows: while molar ratio of cyclohexyl alcohol to acetic acid was 1.2,weight of the catalyst was 0.7 g(when acetic acid was 0.2 mol),the amount of the water removing reagent was 12 mL,the reacting time was(2.5 h.)The yield of esterification was about 96.6%.