Separation of ethylbenzene/styrene systems using ionic liquids in ternary LLE

Monika Karpińska , Urszula Domańska-Żelazna , Michał Wlazło

Abstract

In this work, we studied the applicability of six imidazolium-based ionic liquids (ILs) with different anions dicyanamide, [DCA]− and tricyanomethanide, [TCM]− in the separation of ethylbenzene/styrene compounds. Experimental values for liquid–liquid equilibrium (LLE) were obtained for various binary and ternary mixtures of {IL (1) + styrene (2) + ethylbenzene (3)} at T = 298.15 K and ambient pressure. Six ILs have been studied: 1-ethyl-3-methylimidazolium dicyanamide, [EMIM][DCA], 1-ethyl-3-methylimidazolium tricyanomethanide, [EMIM][TCM], 1-allyl-3-methylimidazolium dicyanamide, [AMIM][DCA], 1-butyl-3-methylimidazolium dicyanamide, [BMIM][DCA], 1-butyl-3-methylimidazolium tricyanomethanide, [BMIM][TCM] and 1-benzyl-3-methylimidazolium dicyanamide, [BzMIM][DCA]. The ionic liquids were chosen after a literature analysis and measurements of activity coefficient at infinite dilution in many ILs. The ILs chosen have shown very good 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 aromatic hydrocarbon-rich layer after the experiment. This is convenient for planned new technology, because it eliminates the step needed for the separation of the solvent. A comparative study of the separation effectiveness of the [AMIM][DCA] in comparison with other reported ILs was chosen as the best solvent for the intended separation process. 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 Monika Karpińska ZChF
Monika Karpińska,,
- Department Of Physical Chemistry
, Urszula Domańska-Żelazna ZChF
Urszula Domańska-Żelazna,,
- Department Of Physical Chemistry
, Michał Wlazło ZChF
Michał Wlazło,,
- Department Of Physical Chemistry
Journal seriesJournal of Chemical Thermodynamics, ISSN 0021-9614
Issue year2016
Vol103
Pages423-431
Publication size in sheets0.5
Keywords in EnglishIonic liquids; Ternary (liquid–liquid) phase diagrams; Selectivity; Solute distribution ratio; NRTL correlation; Separation ethylbenzene/styrene
DOIDOI:10.1016/j.jct.2016.09.003
URL http://www.sciencedirect.com/science/article/pii/S002196141630252X
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)35
ScoreMinisterial score = 30.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 2.726 (2) - 2016=2.784 (5)
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