Imidazolium and pyridinium-based ionic liquids for the cyclohexane/cyclohexene separation by liquid-liquid extraction
authors Delgado-Mellado, N; Ovejero-Perez, A; Navarro, P; Larriba, M; Ayuso, M; Garcia, J; Rodriguez, F
nationality International
journal JOURNAL OF CHEMICAL THERMODYNAMICS
author keywords Cyclohexane/cyclohexene separation; Liquid-liquid extraction; Ionic liquids; NRTL model
keywords BINARY-MIXTURES HEXANE/HEX-1-ENE; ACTIVITY-COEFFICIENTS; INFINITE DILUTION; ORGANIC SOLUTES; PHYSICOCHEMICAL PROPERTIES; ALIPHATIC-HYDROCARBONS; SOLVENT-EXTRACTION; WATER; CYCLOHEXENE; BENZENE
abstract The separation of olefins/paraffins is a challenge for the petrochemical industry due to the close boiling points of these hydrocarbons. In this work we have studied the feasibility of different imidazolium and pyridinium-based ionic liquids (ILs) as alternative solvents in the cyclohexane/cyclohexene separation. Five ILs have been studied, namely 1-butyl-4-methylpyridinium tricyanomethanide ([4bmpy][TCM]), bis(1-ethyl-3-methylimidazolium) tetrathiocyanatocobaltate ([emim](2)[Co(SCN)(4)]), bis(1-butyl-3-methylimidazolium) tetrathiocyanatocobaltate ([bmim](2)[Co(SCN)(4)]), 1-ethyl-4-methylpyridinium bis(trifluoromethylsulfonyl)imide ([4empy][Tf2N]), and 1-butyl-4-methylpyridinium bis(trifluoromethylsulfonyl)imide ([4bmpy][Tf2N]). Experimental liquid-liquid equilibrium (LLE) data were obtained for the equimolar ternary mixtures {cyclohexane (1) + cyclohexene (2) + IL (3)} at T = (298.2, 313.2 and 328.2) K and atmospheric pressure in order to study the effect of the temperature on the extractive properties. Afterwards, LLE data for every ternary system was determined at the best temperature and for the whole cyclohexane/cyclohexene composition range. These ILs have shown promising results in terms of distribution ratio and selectivity, showing the [4bmpy][TCM] IL the best extractive properties at 298.2 K and atmospheric pressure. The Non-Random Two Liquids (NRTL) model was used to successfully correlate the experimental LLE data. (C) 2018 Elsevier Ltd.
publisher ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
issn 0021-9614
isbn 1096-3626
year published 2019
volume 131
beginning page 340
ending page 346
digital object identifier (doi) 10.1016/j.jct.2018.11.018
web of science category Thermodynamics; Chemistry, Physical
subject category Thermodynamics; Chemistry
unique article identifier WOS:000454515300036
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journal analysis (jcr 2019):
journal impact factor 2.888
5 year journal impact factor 2.5
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