1-甲基-3-丙磺酸基咪唑硫酸氢盐催化合成酯的研究

摘要

In this study,1-methyl-3-propyl sulfonic acid hydrogen sulfate imidazole salt [ prmim] [ HSO4-] ionic liquids was used as catalysts to synthesize isoamyl butyrate and butyl isobutyrate. The effect of alkyd mole rati-o,catalyst dosage and reaction time on the esterification rate was investigated and reuse performance of catalyst was also discussed. The results indicate that the esterification rates reach 93. 07% and 92. 96% when alkyd molar weight ratio is 1. 4 ∶ 1,the dosage of catalyst is 2. 0 mL and the reaction time is 3. 5 h,respectively. The generated carboxylic acid ester is not dissolved in the catalytic system,and the catalyst separation process can be realized by adopting the separatory funnel. Catalytic performance is not obviously decreased after Ionic liquid circulation was reused 6 times.%研究采用1-甲基-3-丙磺酸基咪唑硫酸氢盐[ prmim][ HSO4]离子液体作为催化剂合成了异丁酸异戊酯、异丁酸丁酯,考察醇酸摩尔比、催化剂用量、反应时间对酯化率的影响,分析催化剂的重复使用效果。结果表明：当醇酸摩尔量比为1.4∶1,催化剂用量为2.0 mL,反应时间为3.5 h时,异丁酸异戊酯和异丁酸丁酯的酯化率分别达到93.07%和92.96%。生成的羧酸酯不溶于催化体系,采用分液漏斗能够实现催化剂的分离过程。离子液体循环使用6次,催化效果无明显降低。