负载型离子液体催化合成马来酸二乙酯

Synthesis of Diethyl Maleate by Silica-Supported Ionic Liquid

摘要:

设计合成了4种负载型离子液体[Silica-Ps-Mor]HSO4、[Silica-Ps-Mor]PTSA、[Silica-Ps-Mor]H2PO4和[Silica-Ps-Mor]BF4，采用傅里叶变换红外光谱、热重分析和N2吸附-脱附等方法对样品进行表征，通过顺丁烯二酸酐和乙醇的酯化反应考察其催化性能。结果表明：当n(C4H2O3)：n（C2H6O）=1：3.5，催化剂[Silica-Ps-Mor]HSO4用量为顺丁烯二酸酐质量的5%，带水剂30 mL，反应温度90℃，反应时间为4小时，酯收率可达94.5%。负载型离子液体作为催化剂，反应结束经抽滤便可回收再利用，催化剂循环使用8次，酯收率没有明显的降低。

Abstract:

In order to reduce the amount of ionic liquids, used silica to designed and synthesized supported ionic liquids which was synthesized from morpholin. The silica-ILs catalyst was characterized by FT-IR spectroscopy, thermogravimetric analysis and N2 adsorption-desorption. And the catalytic performance of the catalyst was measured for esterification reaction. The results showed: n(cis-butenedioic anhydride):n(ethanol)=1:3.5, the mass of catalyst [Silica-Ps-Mor]HSO4 is 5% of the quality of cis-butenedioic anhydride, water carrying agentreaction is 30 mL, temperature is 90 ℃, reaction time is 4 h, the yield of diethyl maleate was up to 94.5%. The supported catalyst could be easily separated from the reaction system and reused at least eight times without loss of catalytic activity.