Liquid-liquid separation of hexane/hex-1-ene and cyclohexane/cyclohexene by dicyanamide-based ionic liquids

Monika Karpińska , Michał Wlazło , Maciej Zawadzki , Urszula Domańska-Żelazna


The work presented focused on the experimental liquid-liquid phase equilibrium measurements in ternary systems {ionic liquid (1) + hex-1-ene (2) + hexane (3)} and (ionic liquid (1) + cyclohexene (2) + cyclohexane (3)} at temperature T = 298.15 K and ambient pressure. The dicyanamide-based ionic liquids (ILs) were discussed as solvents for two types of separation problems of hexane/hex-1-ene and cyclohexane/cyclohexene. The objective of this work was to explore the feasibility of six ILs, namely N-ethyl-N-methylmorpholinium dicyanamide, [EMMor][DCA], (3-hydroxypropyl)-1-methylmorpholinium dicyanamide, [N-C3OHMMor][DCA], 1-(3-hydroxypropyl)-3-methylimidazolium dicyanamide, [N-C3OHMIM][DCA], 1-(3-hydroxypropyl)pyridinium dicyanamide, [N-C3OHPy][DCA], (3-cyanopropyl)pyridinium dicyanamide, [N-C3CNPy][DCA] and (3-cyanopropyl)methylpyrrolidinium dicyanamide,[N-C3CNMPyr][DCA]. The separating ability of the investigated ILs was compared with the previously measured by us in ternary LLE ILs for these chosen separation problems. The effect of cation for the same anion was examined with respect to the selectivity and solute distribution ratio in these processes. The separation effectiveness of the [N-C3CNMPyr][DCA] in comparison with other ILs used in this work is the best for hexane/hex-1-ene separations but lower than those presented by us earlier for [EMIM][DCA], however with better solute distribution coefficient. The experimental tie-lines were correlated with the non-random two liquid NRTL model. The proposed [N-C3CNMPyr][DCA] may be used as an alternative solvent for the separation of alkenes from alkanes and [EMMor][DCA] for cyclohexane/cyclohexene separation.
Author Monika Karpińska ZChF
Monika Karpińska,,
- Department Of Physical Chemistry
, Michał Wlazło ZChF
Michał Wlazło,,
- Department Of Physical Chemistry
, Maciej Zawadzki ZChF
Maciej Zawadzki,,
- Department Of Physical Chemistry
, Urszula Domańska-Żelazna ZChF
Urszula Domańska-Żelazna,,
- Department Of Physical Chemistry
Journal seriesJournal of Chemical Thermodynamics, ISSN 0021-9614
Issue year2018
Publication size in sheets0.5
Keywords in EnglishLiterature reviewExperimental LLE measurementsIonic liquids with [DCA]− anionSelectivitySolute distribution ratioNRTL correlation
Languageen angielski
1-s2.0-S0021961417303336-main.pdf 3.11 MB
Score (nominal)35
ScoreMinisterial score = 30.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 2.726 (2) - 2016=2.784 (5)
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