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Liquid–Liquid Equilibria for Mixtures of Hexadecane and Ethanol with Imidazolium-Based Ionic Liquids

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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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Acknowledgments

The authors would like to thank the National Research Foundation (NRF) through the Thuthuka program and the SARChI South African Research Chairs Initiative - NRF-DST for their financial support.

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  1. Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban, 4041, South Africa

    Niren Mungar Ram, Indra Bahadur, Trevor M. Letcher, Paramespri Naidoo & Deresh Ramjugernath

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  1. Niren Mungar Ram
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  2. Indra Bahadur
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Correspondence to Deresh Ramjugernath.

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Mungar Ram, N., Bahadur, I., Letcher, T.M. et al. Liquid–Liquid Equilibria for Mixtures of Hexadecane and Ethanol with Imidazolium-Based Ionic Liquids. J Solution Chem 44, 593–605 (2015). https://doi.org/10.1007/s10953-015-0294-4

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