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

• Published in: The Journal of chemical thermodynamics Vol. 139; p. 105866
• Main Authors: Orchillés, A. Vicent, Vercher, Ernesto, Miguel, Pablo J., González-Alfaro, Vicenta, Llopis, Francisco J.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2019
• Subjects: 1-Ethyl-3-methylimidazolium dicyanamide; Extractive distillation; Ionic liquids; Isobaric VLE; tert-Butyl alcohol; Water; Isobaric VLE; Water; Ionic liquids; Extractive distillation; 1-Ethyl-3-methylimidazolium dicyanamide; tert-Butyl alcohol
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2019.07.008

[Display omitted] •VLE of binary and ternary systems of tert-butyl alcohol, water and [emim][DCA] at 100 kPa.•The e-NRTL model fits the VLE data of tert-butyl alcohol + water + [emim][DCA] system.•[emim][DCA] breaks the tert-butyl alcohol + water azeotrope at an IL mole fraction >0.095. Isobaric vapor-liquid equilibria for the binary systems tert-butyl alcohol + water, and tert-butyl alcohol + 1-ethyl-3-methylimidazolium dicyanamide ([emim][DCA]), as well as the vapor-liquid equilibria for the tert-butyl alcohol + water + [emim][DCA] ternary system, have been obtained at 100 kPa using a recirculating still. The electrolyte nonrandom two-liquid (e-NRTL) model was successfully used for fitting the experimental data. The effect of [emim][DCA] on the tert-butyl alcohol + 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 100 kPa when the ionic liquid mole fraction is >0.095.