N-甲基咪唑硫酸氢盐催化合成增塑剂柠檬酸三丁酯

摘要

在离子液体N-甲基咪唑硫酸氢盐([Hmim]+[HSO4]-)的催化下,以柠檬酸和正丁醇为原料,合成了无毒增塑剂柠檬酸三丁酯.结果表明,[Hmim]+[HSO4]-催化合成柠檬酸三丁酯的最佳工艺条件为:n(柠檬酸)∶n(正丁醇)=1∶4.5,催化剂用量占反应物料总质量的5％,反应时间3.5h,在此条件下产品收率97.31％,催化剂重复使用5次,仍保持较好的催化活性.产品经红外光谱、核磁进行定性分析,纯度经气相色谱分析大于99.0％.%Tributyl citrate was synthesized by citric acid and n-butanol with iV-methyl-imidazolium hydrosulfate as catalyst. Experiment results indicated that the optimum process conditions were as follows;molar ratio of citric acid to n-butanol 1:4.5 , the amount of catalyst 5% of the mass of reactants, reaction time 3.5 h, the yield was up to 97.31% . After the catalyst being used for 5 times,activity did not significantly decline. Qualitative analysis of product was carried out by IR and NMR. Purity of product analyzed by GC was over 99.0%.