The Synthesis of Tributyl Citrate with Catalytic Esterification

The solid acid catalyst , the reaction of citric acid with n-butanol catalyzed esterification synthesis of tributyl citrate . The detection reaction process by high performance liquid chromatography , the obtained liquid chromatography analysis of the reaction system suitable conditions , namely: UV detection wavelength 230nm, binary mobile phase acetonitrile : water = 80:20 , flow rate 1.0ml/min . In this paper, the IR and TPD law of the cation exchange resin and homemade physical and chemical properties of activated carbon supported phosphotungstic acid catalysts characterized by result : resin acidic water conditions . Using a batch reactor, and tributyl citrate was synthesized using the above catalyst under conditions of continuous stirring . Experimental results show that the resin has the advantages of high catalytic activity, and no corrosion, and post-treatment process is simple . Resin as a catalyst in catalytic esterification of experimental conditions such as the amount of catalyst , the feed ratio, reaction time , reaction temperature, etc. have been studied and proposed more suitable esterification conditions , namely: the amount of catalyst 4g , the acid to alcohol ratio of 1 : 3.5 , reaction time 4h, the temperature does not exceed 140 ℃. Under this condition , detected by liquid chromatography , citric acid tributyl yield was 96.32% or more, and the catalyst can be used repeatedly . In addition , atmospheric pressure and a temperature range of 388.15K-398.15K acidic resin catalyzed esterification synthesis of tributyl citrate reaction of citric acid and n-butanol dynamics study . The research results show that the catalytic synthesis of tributyl citrate esterification reaction series an irreversible reaction , that is , within the range of experimental conditions , citric acid , butyl produce citric acid dibutyl generating citrate , citric acid dibutyl butyl kinetic equation kinetic equation :