【摘要】 以离子液体代替对甲苯磺酸为催化剂催化合成α-甲基丙烯酸十八酯,比较不同离子液体的催化性能,选出最佳催化剂,探索其催化的最优条件与离子液体的循环使用效果,并讨论了离子液体代替对甲苯磺酸作催化剂的优势。结果表明,在所选用的8种离子液体中,[HSO₃-pmim][HSO₄]的催化效果最好,在m（[HSO₃-pmim][HSO₄]）/m（Stearyl alcohol）=0.008、n（α-Methacrylic acid）/n（Stearyl alcohol）=1.2、m（Inhibitor）/m（Stearyl alcohol）=0.008、反应温度120℃、反应时间5h的条件下,酯化产率可达73.8%;循环使用4次后,酯化产率无明显下降。离子液体代替对甲苯磺酸作催化剂,提高了酯化产率,明显减少了粗酯处理中碱液和水的用量,有效地减少废水排放,降低环境污染。更多还原

【Abstract】 A series of ionic liquids were used as catalyst instead of p-toluenesulfonic acid in the synthesis of stearylα-methacrylate.The catalytic performances of different kinds of ionic liquids were measured and then the best catalyst was selected.The reaction conditions for the synthesis of stearylα-methacrylate and the recycling of ionic liquid were evaluated.The advantages of ionic liquids instead of p-toluenesulfonic acid as catalyst were discussed.The results indicated that among the eight selected ionic liquids [HSO₃-pmim][HSO₄]possessed the best catalytic performance in the synthesis of stearylα-methacrylate and under the optimized reaction conditions of 120℃,5h,m（[HSO₃-pmim][HSO₄]）/m（Stearyl alcohol）=0.008,n（α-Methacrylic acid）/n（Stearyl alcohol）=1.2,m（Inhibitor）/m（Stearyl alcohol）=0.008,the yield of stearylα-methacrylate was 73.8%.The ionic liquid can be reused for more than four times without remarkable loss of catalytic activity.The ionic liquid instead of p-toluenesulfonic acid as catalyst enhanced the production rate of esterification,at the same time,the consumptions of lye and water in processing crude ester were reduced,which meant that the discharge of waste water was lowered and the environment pollution was reduced.更多还原