1-(2-Hydroxyethyl)-3-methylimidazolium
bis(trifluoromethylsulfonyl)imide
ionic liquid ([hemim][NTf2]) was synthesized as a new functionalized
ionic liquid to study the effect of addition of the hydroxyl group
to the imidazolium cation on aliphatic/aromatic separations. For this
purpose, liquid–liquid equilibrium (LLE) data for {heptane
+ toluene or benzene + 1-(2-hydroxyethyl)-3-methylimidazolium bis
(trifluoromethylsulfonyl)imide ([hemim][NTf2])} systems
were measured at 313.2 K and atmospheric pressure. The measured LLE
data were correlated using three basically distinct thermodynamic
models; that is, nonrandom two-liquid (NRTL), Othmer–Tobias,
and Hand correlations. Results show that there is good agreement between
correlated and experimental data. Our experimental results indicate
that the addition of the hydroxyl group to imidazolium cation significantly
enhances the performance of the ionic liquid in terms of selectivity.
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