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Co-solvent effects in LLE of 1-hydroxyethyl-3-methylimidazolium based ionic liquids plus 2-propanol plus dichloromethane or 1,2-dichloroethane

Research output: Contribution to journalJournal article

Published

  • Vesna Najdanovic-Visak
  • Ana Rodriguez
  • Zoran P. Visak
  • Joao N. Rosa
  • Carlos A. M. Afonso
  • Manuel Nunes da Ponte
  • Luis Paulo N. Rebelo
Journal publication date15/06/2007
JournalFluid phase equilibria
Journal number1-2
Volume254
Number of pages7
Pages35-41
Original languageEnglish

Abstract

Several regimes of the (T, x(1), x(2)) surface of the liquid-liquid phase diagram at or close to a nominal pressure of 0.1 MPa of the ternary systems 1-hydroxyethyl-3-methylimidazolium based ionic liquids (1), [C(2)OHmim][X] ([X] = [PF6](-) or [BF4](-) or [CF3SO3](-) or [(CF3SO2)(2)N](-)), +dichloromethane or 1,2-dichloroethane (2), +2-propanol (3) were investigated. For the first time, phase splitting in a (IL + dichloromethane) system was found and the related temperature-composition phase diagrams for all aforementioned ILs were determined. In the case of 2-propanol, partial miscibility was observed only for ILs containing the [PF6](-) and [BF4](-) anions. When the latter are involved in ternary systems, the ternary phase diagrams at ambient conditions show wide areas of total miscibility, thus revealing an unexpected and large co-solvent effect. For the ternary mixture ([C-2 OHmim] [PF6] + dichloromethane + 2-propanol), a moderate pressure effect on the cloud point with a negative pressure-temperature slope was detected. (c) 2007 Elsevier B.V. All rights reserved.