No abstract

A B S T R A C TIsobaric vapor-liquid equilibrium (VLE) data for ternary systems of methyl acetate + methanol containing three ionic liquids (ILs) were measured at 101.3 kPa. The investigated ILs were 1-hexyl-3-methylimidazolium chloride ([HMIM][Cl]), 1-benzyl-3-methylimidazolium chloride ([BzMIM][Cl]), and 1-hexyl-3-methylimidazolium bromide ([HMIM][Br]). The results indicate that the addition of ILs can give rise to the increase of the relative volatility of methyl acetate to methanol. Besides, the more ILs, the larger the relative volatility. All the three investigated ILs can eliminate the azeotropic point of methyl acetate and methanol, and the separation effect follows the order: [HMIM][Cl] > [BzMIM][Cl] > [HMIM] [Br]. Additionally, the measured VLE data are well correlated with NRTL model.

Ionic liquids (ILs) as entrainers for the separation of ethyl acetate and 2-propanol azeotropic mixture were proposed in this work. Through the isobaric vapor-liquid equilibrium (VLE) experiments, we found that the three investigated ILs, namely 1-butyl-3-methylimidazolium acetate ([BMIM][Ac]), 1-butyl-3-methylimidazolium bromide ([BMIM][Br]), and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF 4 ]), could significantly enhance the separation factor of ethyl acetate and 2-propanol, and eliminate the azeotropic point. [BMIM][Ac] produced the most notable salting-out effect on ethyl acetate and 2-propanol among the three investigated ILs. Moreover, the experimental data were well correlated with the non-random two liquid (NRTL) model. Finally, σ-Profiles of solvents and ILs were used to explain the different separate abilities of the three investigated ILs.