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| - Liquid−Liquid Equilibria of Hydrofluoroethers and Ionic Liquid1-Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide
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| - Binary liquid−liquid equilibria (LLE) in mixtures of five hydrofluoroethers and room-temperature ionic liquid,1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, have been measured for the first time using thevolume−mass method. All five binary systems show large immiscibility gaps. The ionic liquid-rich side solutionsbecome increasingly more soluble in HFE (hydrofluoroether) as the HFE normal boiling point decreases. ObservedLLE are well correlated by use of the nonrandom two liquid (NRTL) solution model. The excess molar volumesof the HFE and ionic liquid rich side solutions are small and similar to ordinary binary mixtures which is oppositeto what we have previously reported with hydrofluorocarbons (HFCs) in ionic liquids. Therefore, the insertion ofan ether oxygen has changed the liquid structure of HFEs vs HFCs in ionic liquids.
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