嫁接型咪唑类碱性离子液体催化合成丙二醇醚

Synthesis of Propylene Glycol Methyl Ether by Grafted Imidazole Basic Ionic Liquids

应用超声波技术在温和条件下制得了嫁接型咪唑类碱性离子液体.应用Hammett指示剂、29 SiNMR和元素分析方法对所制备的样品进行了表征.结果表明,离子液体基团以共价键嫁接到载体二氧化硅上,阴离子不同嫁接型离子液体的碱强度不同.在甲醇和环氧丙烷合成丙二醇醚的反应中对样品的催化性能做了测试.结果表明,样品在此反应中反应物转化率均大于88%,样品表现出较好的重复使用性能.

A series of grafted imidazole basic ionic liquids were prepared by ultrasonic technique under mild condition.The samples were characterized by indicator dye adsorption,29SiNMR spectra and element analysis method.The characterization results proved that the ionic liquids groups were grafted onto the inner wall of the silica gel.The basic strengths of grafted ionic liquids were different.The samples exhibited promising catalytic properties with high conversions（＆gt;88 %） and reusability,towards the synthesis of propylene glycol methyl ether from methanol and propylene oxide.