Abstract
The applicability of 1-alkyl-imidazoluim-based ionic liquids (ILs) for the extraction of ethanol from hexadecane by solvent extraction was studied by determining the liquid–liquid equilibrium (LLE) data for the ternary systems: {hexadecane (1) + ethanol (2) + 1,3-dimethylimidazolium methyl sulfate, [MMIM][MeSO4] (3) or 1-ethyl-3-methylimidazolium methyl sulfate, [EMIM][MeSO4] (3), or 1-butyl-3-methylimidazolium methyl sulfate, [BMIM][MeSO4] (3)} at T = 298.15 K and p = 1 atm. The selectivities and distribution coefficients of the solute, derived from the measured tie-line data, were used to examine the ability of these ILs as solvents to extract ethanol from a hexadecane-ethanol mixture. The temperature dependency was investigated by measuring the LLE data for {hexadecane (1) + ethanol (2) + [MMIM][MeSO4] (3)} at T = 313.15 K and p = 1 atm. The Othmer–Tobias and Hand equations were used to establish the quality of the LLE data. Finally, the experimental tie-line data were correlated using the Non-Random Two Liquid model.
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