Gas separations in fluoroalkyl-functionalized room-temperature ionic liquids using supported liquid membranes

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• 作者：Jason E. Bara ; Christopher J. Gabriel ; Trevor K. Carlisle ; Dean E. Camper ; Alexia Finotello ; Douglas L. Gin ; Richard D. Noble
• 关键词：Room-temperature ionic liquid ; Synthesis ; CO₂ ; Fluorinated ; Supported ionic liquid membrane
• 刊名：Chemical Engineering Journal
• 出版年：2009
• 出版时间：1 April 2009
• 年：2009
• 卷：147
• 期：1
• 页码：43-50
• 全文大小：321 K

文摘

A series of four imidazolium salts containing increasing lengths of fluoroalkyl substituents was synthesized. The three that exist as molten salts at 296 K were tested for their gas separation properties relating to CO₂, O₂, N₂ and CH₄ using a supported ionic liquid membrane (SILM) configuration. These fluoroalkyl-functionalized room-temperature ionic liquids (RTILs) were found to exhibit ideal selectivities for CO₂/N₂ separation that were lower than their alkyl-functionalized analogues, but higher ideal selectivity for CO₂/CH₄ separation. The differences in performance of fluoroalkyl-functionalized RTILs relative to their alkyl-functionalized counterparts are explained through the use of solubility parameters, group contributions and in context of the classically observed deviations of fluorocarbons from “regular” solution behavior.