Ultrapurification of Ionic Liquids
نویسندگان
چکیده
Ionic liquids (ILs) have received a great increase in attention in the fields of engineering during last decade due to their unique properties. ILs are a very important class of non volatile environmentally friendly solvents (Tm< 100°C) in (bio)catalysis -applicable to many ionic, polar and non polar structure groupsand as efficient electrolytes [1]. The applications range from electrochemistry, sensors, analysis, separation techniques to catalysis and reaction engineering. Furthermore it is most important to realize low production cost including efficiently techniques for purification and ultra purification. The paper will present results of purification and ultra purification of EMIM-Chloride and EMIM-Bromide (EMIM: 1-ethyl-3-methyl-imidazolium) by melt crystallization. Different techniques for purification are discussed: zone melting, layer crystallization and dry sweating in lab scale [2] und layer crystallization for static and dynamic crystallization conditions in pilot scale. Results are used for basic engineering of large scale plants. In the case of EMIMChloride segregation coefficients are in the range of 0,0599,99%.
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تاریخ انتشار 2007