Synthesis of tributyl citrate using homogeneous catalysis of sulfamic acid as catalyst

In this paper,the homogeneous catalysis of sulfamic acid was used as catalyst for the synthesis of tributyl citrate from citric acid and buty l alcohol. The catalyst showed a high catalytic activity. There acting time was 90 min,acting temperature 100~150 ℃,the amount of catalyst(W sulfamic acid /W citric acid)was 6.0% and the ratio of reactants was:n(citric acid)︰n(butyl alcohol)=1︰5.5. In the optimun condition,the yield of esterification was 98.6%.