1-(3-磺酸基)丙基-3-甲基咪唑磷钨酸盐催化合成柠檬酸三丁酯

Synthesis of tributyl citrate using 1-(3-sulfonic group) propyl-3-methyl imidazolium phosphotungstate as the catalyst

以1-(3-磺酸基)丙基-3-甲基咪唑磷钨酸盐([MIMPS]3PW12O40)为催化剂,考察了醇酸物质的量比、反应时间和催化剂用量对合成柠檬酸三丁酯的影响及催化剂重复使用性能。结果表明,在醇酸物质的量比为4.0∶1、反应时间5 h、催化剂用量为柠檬酸质量的2%和反应温度不高于140℃条件下,酯化率高达99.7%,并具有良好重复使用效果。

The synthesis condition of tributyl citrate using 1-（3-sulfonic group） propyl-3-methyl imidazolium phosphotungstate（3PW12O40） as the catalyst was investigated.The results showed that the esterification yield of 99.7% was obtained under the optimum esterification condition as follows：molar ratio of n-butanol to citric acid 4.0∶1,reaction time 5 h,catalyst dosage 2% of citric acid mass,reaction temperature below 140 ℃.The catalyst possessed good effects of repeated use.