Solubility of fluorinated compounds in a range of ionic liquids. Cloud-point temperature dependence on composition and pressure

Rui Ferreira, Marijana Blesic, Joana Trindade, Isabel M. J. Marrucho, José N. Canongia Lopes, Luís Paulo N. Rebelo

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

In this work, we explore the mutual solubility of a number of mixtures of commonly used ionic liquids (imidazolium, pyridinium, phosphonium and ammonium ionic liquids) with partially fluorinated n-alcohols (C7 to C 10) or perfluoroheptane. The corresponding T-x diagrams at atmospheric pressure were measured through cloud-point temperature determinations. For some selected systems under near-critical isopleth conditions, pressure effects were also studied. The results are discussed in terms of (i) shifts in the immiscibility envelopes as the cation alkyl-chain length is changed, (ii) the nature of the cation or the anion, (iii) the increasing length of the fluorinated/alkylic moiety of the partially fluorinated alcohol, or (iv) comparisons with similar systems involving normal alcohols.

Original languageEnglish
Pages (from-to)918-928
Number of pages11
JournalGreen Chemistry
Volume10
Issue number9
DOIs
Publication statusPublished - 1 Sep 2008

Keywords

  • Binary mixtures
  • Ionic liquids
  • Coexistence curves

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