Synthesis of Tributyl Citrate Catalyzed by Acid Ionic Liquid

Four kinds of ionic liquids were synthesized and used in preparation of tributyl citrate(TBC).The effects of different catalysts,mole ratio of reactants and reuse performance of ionic liquids on the conversion of tributyl citrate(TBC)were investigated.Results show that the were efficient for the reaction with the conversion of 97% in mild conditions.The optimum reaction condition: mole ratio of citrate acid to butanol was 1:5,catalyst amount was 15% of reactants and reaction time was 3 h.Separated from the products, could be reused 10 times without any disposal and the conversion could reach 96%.