Isobaric vapor-liquid equilibria for the extractive distillation of 2-propanol+water mixtures using 1-ethyl-3-methylimidazolium dicyanamide ionic liquid

• Published in: The Journal of chemical thermodynamics Vol. 110; pp. 16 - 24
• Main Authors: Orchillés, A. Vicent, Miguel, Pablo J., González-Alfaro, Vicenta, Llopis, Francisco J., Vercher, Ernesto, Martínez-Andreu, Antoni
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-07-2017
• Subjects: 1-Ethyl-3-methylimidazolium dicyanamide; 2-Propanol; Extractive distillation; Ionic liquids; Isobaric VLE; Water; Isobaric VLE; Water; Ionic liquids; Extractive distillation; 1-Ethyl-3-methylimidazolium dicyanamide; 2-Propanol
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2017.02.005

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•VLE of binary and ternary systems of 2-propanol, water and [emim][DCA] at 100kPa.•The e-NRTL model fits the VLE data of 2-propanol+water+[emim][DCA] system.•[emim][DCA] breaks the 2-propanol+water azeotrope at an IL mole fraction >0.085.
Isobaric vapor–liquid equilibria for the binary systems 2-propanol+water, 2-propanol+1-ethyl-3-methylimidazolium dicyanamide ([emim][DCA]), and water+[emim][DCA] as well as the vapor–liquid equilibria for the 2-propanol+water+[emim][DCA] ternary system have been obtained at 100kPa using a recirculating still. The electrolyte nonrandom two-liquid (e-NRTL) model was used for fitting successfully the experimental data. The effect of [emim][DCA] on the 2-propanol+water system has been compared with that produced by other ionic liquids reported in the literature. From the results, [emim][DCA] appears as a good entrainer for the extractive distillation of this solvent mixture, causing the azeotrope to disappear at 100kPa when the ionic liquid mole fraction is greater than 0.085.