VLE measurement of binary systems containing imidazolium ionic liquids and water or ethanol

Experimental VLE data for binary systems of ethanol or water with three 1-ethyl-3-methylimidazolium ionic liquids (ILs) containing different anions were measured at normal pressure using the Siwoloboff procedure. ILs selected in this study those that appear to be suitable ethanol−water mixture separation by extractive distillation. Measured vapor–liquid equilibria described extended Raoult's law components activity coefficients calculated NRTL equation. Detailed analysis is presented form equilibrium diagrams, variation composition and thermodynamic consistency tests. t – x within a wider range compositions compared found literature. Boiling point temperature measurement mixtures (adapted procedure) provided comparable results obtained applying conventional methods estimation (circulation method, ebulliometric measurement, etc.). Reliability experimental adapted procedure high ILs’ content (high temperature) affected accuracy measurement. However, trend these useful description concentration regions where usually only coarse extrapolation applied. wide (IL more than 70 mole%) seem ternary equipment simulations, e.g. distillation columns.