Effect of Ionic Liquids on the Isobaric Vapor-Liquid Equilibrium Behavior of Acetone-Chloroform

Abstract

Isobaric vapor-liquid equilibrium (VLE) data of the ternary system acetone + chloroform + 1,3-dimethylimidazolium dimethylphosphate ([MMIM][DMP]) or 1-ethyl-3-methylimidazolium diethylphosphate ([EMIM][DEP]) were obtained at 101.3 kPa. Results indicated that the addition of [MMIM][DMP] or [EMIM][DEP] could eliminate the azeotropic point of the binary system of acetone + chloroform when the mole fraction of ionic liquids (ILs) was above 0.15. Besides, the experimental data could be well correlated by the nonrandom two-liquid (NRTL) model. The structures as well as interactions between molecular solvents (acetone, chloroform) and the ion pairs ([MMIM][DMP], [EMIM][DEP]) were studied by quantum chemical calculations. The result indicated that the interaction energies (ΔE) follow the order of ΔE(acetone + [EMIM][DEP]) > ΔE(acetone + [MMIM][DMP]) > ΔE(chloroform + [EMIM][DEP]) ≈ ΔE(chloroform + [MMIM][DMP]), and chloroform had stronger affinity to ionic liquids than acetone.

Isobaric vapor–liquid equilibrium of tert‐butanol + water + ionic liquids at atmospheric pressure

“…Phosphate-based ILs have been widely applied due to their merits of being halogen-free and simple to synthesize. [29][30][31][32] Isobaric vaporliquid equilibrium (VLE) experiments of five binary systems (TBA (1) + water (2), TBA 1 (3)) were conducted. After that, the nonrandom two-liquid (NRTL) model was adopted to predict the ternary VLE experimental data using the binary interaction parameters.…”

“…In the work reported in the present paper, the ILs 1,3‐dimethylimidazolium dimethylphosphate ([MMIM][DMP]) and 1‐ethyl‐3‐methylimidazolium diethylphosphate [EMIM][DEP] were chosen as solvent to separate the binary azeotrope of TBA and water. Phosphate‐based ILs have been widely applied due to their merits of being halogen‐free and simple to synthesize 29–32 . Isobaric vapor–liquid equilibrium (VLE) experiments of five binary systems (TBA (1) + water (2), TBA (1) + [MMIM][DMP] (3), water (2) + [MMIM][DMP] (3), TBA (1) + [EMIM][DEP] (3) and water (2) + [EMIM][DEP] (3)) and two ternary systems (TBA (1) + water (2) + [MMIM][DMP] (3) and TBA (1) + water (2) + [EMIM][DEP] (3)) were conducted.…”

Isobaric Vapor–Liquid Equilibrium of the Acetonitrile + 1-Propanol + Ionic Liquids at an Atmospheric Pressure

“…These physical properties make ILs have a great potential to be a replacement of organic solvents as the solvent in extractive distillation processes, and thus, they attract more attention. In recent years, many articles using ILs as solvents for separating the azeotropic systems have been published. − The ILs 1-benzyl-3-methylimidazolium chloride ([BzMIM]­Cl), 1-benzyl-3-methylimidazolium bromide ([BzMIM]­Br), and 1-hexyl-3-methylimidazolium bromide ([HMIM]­Br) were used to separate the azeotropic mixture of acetonitrile and n -propanol by Li . The ILs 1,3-dimethylimidazolium dimethylphosphate ([MMIM]­[DMP]) and 1-ethyl-3-methylimidazolium diethylphosphate [EMIM]­[DEP] were used to separate the azeotropic systems for their advantages like halogen-free and simple synthesis in recent years. ,− …”