Determination of Vapor–Liquid Equilibrium of Methyl Acetate + Methanol + 1-Alkyl-3-methylimidazolium Dialkylphosphates at 101.3 kPa

Abstract

Isobaric vapor−liquid equilibrium (VLE) values at 101.3 kPa of binary methyl acetate + methanol, binary methyl acetate + ionic liquids (ILs), binary methanol + ILs, and ternary methyl acetate + methanol + ILs are measured, where the ILs are 1,3-dimethylimidazolium dimethylphosphate ([MMIM][DMP]), 1-ethyl-3-methylimidazolium diethylphosphate ([EMIM]-[DEP]), and 1-butyl-3-methylimidazolium dibutylphosphate ([BMIM][DBP]). The azeotropic point of methyl acetate + methanol is removed with addition of ILs, and [MMIM][DMP] gives the largest effect, followed by [EMIM][DEP] and [BMIM][DBP]. Salting-out effect from ILs is observed where the relative volatility of methyl acetate is increased. The minimum amount of such phosphate ILs required to break the azeotropic point is remarkably less than that of some other ILs; also such phosphate ILs are fluorine-free and easily prepared with cheaper starting materials. The experimental VLE data are correlated well with electrolyte NRTL model.

Measurement and Correlation of Ternary (Liquid + Liquid) Equilibria for Separation of Cyclohexanone from Water via Isophorone or Mesityl Oxide

“…It is clearly established that cyclohexanone and water can form a homogeneous and azeotropic mixture; therefore, the conventional distillation technique is not viable to achieve efficient separation of the mixture. Several special distillation strategies, including reactive distillation, extractive distillation, and azeotropic distillation, could be used for treating the binary azeotrope or close-boiling systems, − although these approaches require a large investment and consume an excessive amount of energy . In view of the above problems, the liquid–liquid extraction, which emerges as a beneficial separation technology due to its low energy consumption and high separation efficiency, has been extensively employed to separate lots of azeotropic mixtures in chemical engineering. − …”

Imidazolinium Ionic Liquid as Effective Separating Agent for Binary Azeotropic Systems

“…EVDOKIMOV et al [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The choice of 1,3-dimethyl-2-phenylimidazolinium bromide as a separating agent is explained by its melting point (according to [21]) being much lower than that of the imidazolinium salt used earlier for the separation of the azeotropic mixture acetone-methanol (1,3-bis(2,4,6-trimethylphenyl) imidazolinium chloride) [3], and by other no less important circumstances: the availability of reagents and the relative simplicity of its synthesis [21].…”

Determination of Density and Viscosity of Binary Mixtures of Water and Dimethyl Sulfoxide with 1-Ethyl-3-methylimidazolium Diethylphosphate [EtMeIm]+[Et2PO4]− at Atmospheric Pressure

“…Wang et al 12 measured the density of pure 1-methyl-3methylimidazolium dimethylphosphate and pure 1-ethyl-3methylimidazolium diethylphosphate at atmospheric pressure. Other authors have studied the physical properties of [EtMeIm] + [Et 2 PO 4 ] − , Ge et al 13 measured activity coefficients at infinite dilution of [EtMeIm] + [Et 2 PO 4 ] − with aromatic and aliphatic compounds, Cao et al 14 discovered that it is possible to break the azeotrope of methyl acetate and methanol by adding 1alkyl-3-methylimidazolium dialkylphosphate ionic liquids by studying the vapor−liquid equilibrium of the three components, and Ghani et al 15 more work has to been done in order to fully understand the dissolution and recovery process of cellulose in ionic liquids. 16 In this work, the density (ρ) and the viscosity (μ) of pure 1ethyl-3-methylimidazolium diethylphosphate and its binary mixtures with water and DMSO were measured over 9 isotherms within the temperature range of 293.15−373.15 K at atmospheric pressure.…”

“…Wang et al measured the density of pure 1-methyl-3-methyl­imid­azolium di­methyl­phosphate and pure 1-ethyl-3-methyl­imidazolium di­ethyl­phosphate at atmospheric pressure. Other authors have studied the physical properties of [EtMeIm] + [Et 2 PO 4 ] − , Ge et al measured activity coefficients at infinite dilution of [EtMeIm] + [Et 2 PO 4 ] − with aromatic and aliphatic compounds, Cao et al discovered that it is possible to break the azeotrope of methyl acetate and methanol by adding 1-alkyl-3-methyl­imida­zolium di­alkyl­phosphate ionic liquids by studying the vapor–liquid equilibrium of the three components, and Ghani et al measured the density, surface tension, and viscosity of ternary mixtures of water + N -methyl­di­ethanol­amine (MDEA) + [EtMeIm] + [Et 2 PO 4 ] − /1,3-dimethyl­imidazolium dimethyl­phosphate ([Me 2 Im] + [Me 2 PO 4 ] − ). Nevertheless, more work has to been done in order to fully understand the dissolution and recovery process of cellulose in ionic liquids …”