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In this work, the experimental liquid-liquid equilibria (LLE) data of water + ethanol + 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([bmim][Tf2N]) system at different temperatures is presented. The LLE of the systems has been measured between 283 and 323 K.The NRTL and UNIQUAC models were applied to the ternary systems. The interaction parameters obtained from both models successfully correlated the equilibrium compositions, however UNIQUAC gave a more accurate correlation. Finally, the solvent capability of ionic liquid was checked in order to separate the mixture formed by ethanol and water. KEYWORDSThis is a previous version of the article published in Journal of Chemical & Engineering Data. 2015, 60(8): 2426-2433

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