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Study on the heterogeneous catalytic synthesis of flavoring propyl caproate

Propyl caproate was synthesized by the esterification of caproic acid and propanol, using solid acid Zr( SO4)2/ Diatomite as the catalyst. The influence of catalyst preparation conditions on the performance of catalyst were studied,and the proper preparation conditions were obtained as following: mass ratio of Zr( SO4)2to Diatomite in the catalyst 4 ∶ 6,calcination temperature 350 ℃,calcination time 2 h. The process conditions of synthesis of propyl caproate catalyzed by solid acid Zr( SO4)2/ diatomite were optimized through orthogonal experiment,and the best catalytic reaction conditions were as follows: mole ratio of caproic acid to n- propyl alcohol 1 ∶ 1. 75,the dosage of catalyst 0. 5g,water carrying agent amount 3 m L,and reaction time 1. 5 h. Under these conditions,the esterification rate of propyl caproate can reach to 99. 2%.