Catalytic synthesis of propyl gallate over solid super acid SO_4~(2-)/TiO_2

Solid super acid SO42-/TiO2 as catalyst,gallic acid and npropyl alcohol as raw materials,the propyl gallate is synthesized.The effect of molar ratio of npropyl alcohol to gallic acid,catalyst dose,calcining heat of catalyst and reaction time on the yield of ester are tested.The results showed that the activity of catalyst was the best when the the catalyst was calcinated at 500 ℃.The better reaction conditions are as follows:the molar ratio of npropyl alcohol to gallic acid is 15∶1,solid super acid SO42-/TiO2 1.8 g,the reaction at 115～120 ℃ for 2.5 h,the yield of ester reached 96.3%.