Separation of hex-1-ene/hexane and cyclohexene/cyclohexane compounds with [EMIM]-based ionic liquids

Urszula Domańska-Żelazna , Monika Karpińska , Michał Wlazło

Abstract

In this work we studied the applicability of three imidazolium-based ionic liquids (ILs) with different anions in the separation of hex-1-ene/hexane and cyclohexene/cyclohexane compounds. Experimental data for liquid–liquid equilibrium (LLE) were obtained for various binary and ternary mixtures of {IL (1) + hex-1-ene (2) + hexane (3)} or {IL (1) + cyclohexene (2) + cyclohexane (3)} at T = 298.15 K and ambient pressure. Three ILs have been studied: 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)-imide, [EMIM][NTf2], 1-ethyl-3-methylimidazolium dicyanamide, [EMIM][DCA] and 1-ethyl-3-methylimidazolium tricyanomethanide, [EMIM][TCM]. ILs were chosen after a literature analysis and measurements of activity coefficient at infinite dilution in many ILs. Chosen ILs showed excellent results in terms of selectivity and solute distribution ratio. The chromatography analysis revealed that the ILs used as an entrainers were not present in the hydrocarbon-rich layer. This is convenient for planned technology, because eliminates the step needed for the separation of the solvent. A comparative study of the separation effectiveness of the [EMIM][TCM] in comparison with two other reported ILs was chosen as the better solvent for the intended two separation processes. The non-random two liquid NRTL model was used successfully to correlate the experimental tie-lines and to calculate the phase composition error in mole fraction in the ternary systems.
Author Urszula Domańska-Żelazna ZChF
Urszula Domańska-Żelazna,,
- Department Of Physical Chemistry
, Monika Karpińska ZChF
Monika Karpińska,,
- Department Of Physical Chemistry
, Michał Wlazło ZChF
Michał Wlazło,,
- Department Of Physical Chemistry
Journal seriesFluid Phase Equilibria, ISSN 0378-3812
Issue year2016
Vol427
Pages421-428
Publication size in sheets0.5
Keywords in English[EMIM]-based ionic liquids; Ternary (liquid-liquid) phase diagrams; Selectivity; Solute distribution ratio; NRTL correlation; Extraction
DOIDOI:10.1016/j.fluid.2016.08.008
URL http://www.sciencedirect.com/science/article/pii/S037838121630382X
project[IP2014 051373] Rozdzielanie węglowodorów nienasyconych od węglowodorów nasyconych za pomocą cieczy jonowych. . Project leader: Wlazło Michał, application date 20-03-2014, start date 12-01-2015, planned end date 30-09-2016, Implemented
WCh Projekty finansowane przez MNiSW
Languageen angielski
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Score (nominal)30
ScoreMinisterial score = 30.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 2.473 (2) - 2016=2.499 (5)
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