摘要
使用离子交换法制备了不同阴离子的咪唑盐离子液体,并通过FT-IR手段对所合成样品进行了表征。以碳酸乙烯酯(EC)与甲醇(MeOH)酯交换合成碳酸二甲酯(DMC)反应,比较了相同催化条件下不同阴离子咪唑盐的催化性能。结果表明:1-丁基-3-甲基咪唑氢氧化物([BmIm]OH)对EC与MeOH酯交换反应表现出优异的催化性能。在反应时间为4 h,温度为67℃,催化剂0.3 g,醇酯比为10:1的条件下,EC的转化率和DMC的选择性分别高达88.5%和90.3%。经重复使用5次后,催化剂仍能保持较好的催化活性。
A series of imidazolium-based ionic liquids with different anions have been synthesized by ion exchange technique and characterized by Fourier transform infrared spectrum. To probe their cata lytic performance, transesterification reactions between ethylene carbonate （EC） and methanol for the synthesis of dimethylene carbonate （DMC） have been carried out. The catalytic results indicated that, among various imidazolium-based ionic liquids employed, 1-butyl-3-ethylimidazolium hydroxide （FBmlm] OH） demonstrated superior catalytic performance to other ionic liquids. The conversion of EC and selectivity of DMC could be up to 88.5% and 90.3 reach its maximum under the optimal reaction conditions that dosage was 0.3 g and reacted at 67 ℃ for 4 h. The [BmIm] respectively, and catalytic activity could a ratio of MeOH/EC OH catalyst could still 10 ： 1, catalysts keep a moderate catalytic activity after five consecutive running tests.
出处
《精细石油化工》
CAS
CSCD
北大核心
2012年第6期58-62,共5页
Speciality Petrochemicals
基金
国家自然科学基金(21076027)
中国石油科技创新基金研究项目(2011D-5006-0508)
江苏省高校自然科学研究基金(11KJD150001)
上海市分子催化和功能材料重点实验室开放课题项目(2011MCIMKF01)
关键词
碳酸乙烯酯
碳酸二甲酯
酯交换
ethylene carbonate
dimethyl carbonate
transesterification
