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萃取精馏实现甲醇/丙酮共沸物的分离是一项重要的工业分离过程.在萃取剂选择上,传统的无机盐类夹带剂存在回收困难、易结晶、腐蚀设备等问题.离子液体取代传统无机盐用作夹带剂具有用量少、易回收、分离效果突出等优势,表现出广阔的工业应用前景[1].例如,离子液体1-乙基-3-甲基咪唑二氰胺盐([Emim][DCA])对甲醇/丙酮共沸物具有较好的分离效果[2].本文采用核磁共振光谱、红外光谱与量子化学计算相结合的方法,分别分析了[Emim][DCA]与甲醇、丙酮的相互作用方式,对[Emim][DCA]在分离甲醇/丙酮共沸体系的作用机理进行研究,探讨了其可能的分离机制.
Extractive distillation of methanol / acetone azeotrope separation is an important industrial separation process.In extractant selection, the traditional inorganic salt entrainer recovery difficulties, easy crystallization, corrosion of equipment and other issues.Ionic liquid to replace the traditional Inorganic salts used as entrainer with less dosage, easy recovery, outstanding separation effect and other advantages, showing a wide range of industrial applications [1] .For example, the ionic liquid 1-ethyl-3-methylimidazolium dicyanamide salt [Emim] [DCA]) has a good separation effect on methanol / acetone azeotrope.2 The combination of [Emim] [DCA] and [ The interaction mechanism of [Emim] [DCA] with methanol / acetone was studied. The possible mechanism of separation was discussed.