论文部分内容阅读
以离子液体为催化剂,在无溶剂体系中,考察了生物质平台化合物甘油转化1,2-甘油碳酸酯的反应.与酸性离子液体和常用无机碱性催化剂相比,碱性离子液体咪唑基1-丁基-3-甲基咪唑([Bmim]Im)、氢氧化1-丁基-3-甲基咪唑([Bmim]OH)、咪唑基1-烯丙基-3-甲基咪唑([Amim]Im)、氢氧化1-烯丙基-3-甲基咪唑([Amim]OH)在甘油与碳酸二甲酯的酯交换反应中表现出优异的活性.其中,以[Bmim]Im离子液体为催化剂时甘油转化率为98.4%和甘油碳酸酯选择性接近100%.另外,该离子液体可以回收重复利用3次后甘油转化率仍可达92%,甘油碳酸酯选择性可近100%.此碱性离子液体催化方法具有反应结果较好、产物分离简单、条件温和以及环境友好等特点.
Using ionic liquid as catalyst, we investigated the reaction of glycerol-converted 1,2-glycerol carbonate from biomass platform compounds in a solvent-free system.Compared with acidic ionic liquids and common inorganic basic catalysts, the ionic liquid imidazolyl 1 ([Bmim] Im), 1-butyl-3-methylimidazolium hydroxide ([Bmim] OH), imidazolyl 1- Amim] Im), 1-allyl-3-methylimidazolium hydroxide ([Amim] OH) showed excellent activity in the transesterification of glycerol with dimethyl carbonate. Among them, [Bmim] Im When the liquid is a catalyst, the conversion of glycerol is 98.4% and the selectivity of glycerol carbonate is close to 100% .In addition, the ionic liquid can be recovered and reused for 3 times, the conversion of glycerol can still reach 92%, the selectivity of glycerol carbonate can be nearly 100% The basic ionic liquid catalytic method has the advantages of good reaction result, simple product separation, mild conditions and environmental friendliness.