固载离子液体催化酯化反应研究

Study on catalytic esterification reaction over immobilized ionic liquid

采用直接合成法制备了4种离子液体,并作为催化剂采用一锅法催化合成系列羧酸正丁酯,结果表明,离子液体[C3SO3Hnmp]HSO4催化合成丁酸正丁酯活性最高。采用溶胶-凝胶法制备固载化离子液体[C3SO3Hnmp]HSO4,利用响应曲面法(RSM)对反应条件进行优化,结果表明,反应温度为120℃、反应时间为3.19 h、酸醇摩尔比为1.14∶1、催化剂质量为正丁醇质量的7%时,丁酸正丁酯预测收率为97.21%,优化条件下实验收率为97.10%。固载离子液体[C3SO3Hnmp]HSO4循环使用6次后仍保持较高的催化活性。

Four kinds of functionalized ionic liquid are prepared through direct synthetic method and used to catalyze the synthesis of series n-butyl carboxylate via one-pot method.The results show that ionic liquid[C3 SO3 Hnmp]HSO4 exhibits the highest activity in catalyzing the synthesis of n-butyl butyrate.The immobilized[C3 SO3 Hnmp]HSO4 is obtained through sol-gel method and the reaction conditions are optimized by means of response surface methodology(RSM).The results show that the predicted yield of butyric acid n-butyl ester reaches 97.21%and the actual yield achieves 97.10%under the optimized reaction conditions that reaction temperature is set at 120℃,reaction lasts for3.19 h,n(butanoic acid)∶n(normal butanol)=1.14∶1,catalyst dosage is 7%(based on normal butanol).The immobilized ionic liquid[C3 SO3 Hnmp]HSO4 remains high activity after reused for 6 times.