Evaluation of the ionic liquids 1-alkyl-3-methylimidazolium hexafluorophosphate as a solvent for the extraction of benzene from cyclohexane: (Liquid plus liquid) equilibria

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Zhou T, Wang Z, Chen L, Ye Y, Qi Z, Freund H, Sundmacher K
Zeitschrift: Journal of Chemical Thermodynamics
Verlag: Elsevier
Jahr der Veröffentlichung: 2012
Band: 48
Seitenbereich: 145-149
ISSN: 0021-9614


Abstract


In the catalytic hydrogenation of benzene to cyclohexane, the separation of unreacted benzene from the product stream is inevitable and essential for an economically viable process. In order to evaluate the separation efficiency of ionic liquids (ILs) as a solvent in this extraction processes, the ternary (liquid + liquid) equilibrium of 1-alkyl-3-methylimidazolium hexafluorophosphate, [C(n)mim][PF6] (n = 4, 5, 6), with benzene and cyclohexane was studied at T = 298.15 K and atmospheric pressure. The reliability of the experimentally determined tie-line data was confirmed by applying the Othmer-Tobias equation. The solute distribution coefficient and solvent selectivity for the systems studied were calculated and compared with literature data for other ILs and sulfolane. It turns out that the benzene distribution coefficient increases and solvent selectivity decreases as the length of the cation alkyl chain grows, and the ionic liquids [C(n)mim][PF6] proved to be promising solvents for benzene-cyclohexane extractive separation. Finally, an NRTL model was applied to correlate and fit the experimental LLE data for the ternary systems studied. (C) 2011 Elsevier Ltd. All rights reserved.



FAU-Autoren / FAU-Herausgeber

Freund, Hannsjörg Prof. Dr.
Professur für Katalytische Reaktoren und Prozesstechnik


Autor(en) der externen Einrichtung(en)
East China University of Science and Technology (ECUST)
Max-Planck-Institut für Dynamik komplexer technischer Systeme / Max Planck Institute for Dynamics of Complex Technical Systems


Zitierweisen

APA:
Zhou, T., Wang, Z., Chen, L., Ye, Y., Qi, Z., Freund, H., & Sundmacher, K. (2012). Evaluation of the ionic liquids 1-alkyl-3-methylimidazolium hexafluorophosphate as a solvent for the extraction of benzene from cyclohexane: (Liquid plus liquid) equilibria. Journal of Chemical Thermodynamics, 48, 145-149. https://dx.doi.org/10.1016/j.jct.2011.12.006

MLA:
Zhou, Teng, et al. "Evaluation of the ionic liquids 1-alkyl-3-methylimidazolium hexafluorophosphate as a solvent for the extraction of benzene from cyclohexane: (Liquid plus liquid) equilibria." Journal of Chemical Thermodynamics 48 (2012): 145-149.

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