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Liquid Extraction of Benzene from Its Mixtures Using 1-Ethyl-3-methylimidazolium Ethylsulfate as a Solvent

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Departamento de Ingeniería Química de la Universidad de Vigo, 36310 Vigo, Spain, and Laboratory of Separation and Reaction Engineering, Departamento de Engenharia Quimica, Facultade de Engenharia, Universidade de Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
* To whom correspondence should be addressed. E-mail: [email protected]. Tel.: +34 986 812 422. Fax: +34 986 812 382.
†Universidad de Vigo.
‡Universidade de Porto.
Cite this: J. Chem. Eng. Data 2010, 55, 11, 4931–4936
Publication Date (Web):August 10, 2010
https://doi.org/10.1021/je100508y
Copyright © 2010 American Chemical Society
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    Abstract

    In this work, the separation of benzene from cycloalkanes (cyclohexane, methylcyclohexane, and cyclooctane) was investigated by liquid extraction using the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate, [EMim][ESO4]. The liquid−liquid equilibrium (LLE) data were measured for the ternary systems formed by cycloalkane, benzene, and [EMim][ESO4] at 298.15 K and atmospheric pressure. The cloud point method was used to determine the solubility curve data, and the tie-line compositions were obtained by density measurements. The selectivity, the percent removal of aromatic, and the solute distribution ratio were calculated from the experimental LLE data. Selectivity and solute distribution ratio values were compared to those previously reported with other ionic liquids and sulfolane. Moreover, the influence of the size of the cycloalkane on the aromatic extraction was analyzed. The reliability of the experimental LLE data was tested using the Othmer−Tobias equation, and the NRTL and UNIQUAC models were used to correlate the experimental LLE data.

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    Solubility curves and Othmer−Tobias parameters, at 298.15 K, for the ternary systems. This material is available free of charge via the Internet at http://pubs.acs.org.

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