Salting-out effects in aqueous ionic liquid solutions: Cloud-point temperature shifts

Joana R. Trindade, Zoran P. Visak, Marijana Blesic, Isabel M. Marrucho, João A.P. Coutinho, José N. Canongia Lopes*, Luis P.N. Rebelo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The effects of the addition of three inorganic salts, namely, NaCl, Na 3SO4, and Na3PO4, on the liquid-liquid (L-L) phase diagram of aqueous solutions containing the model ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate, [bmim][BF 4], were investigated. All three inorganic salts trigger salting-out effects, leading to significant upward shifts of the L-L demixing temperatures of the systems. The magnitude of the shifts depends on both the water-structuring nature of the salt and its concentration; that is, the effects are correlated with the ionic strength of the solution and the Gibbs free energy of hydration of the inorganic salt. The pH effect and the occurrence of salt precipitation in concentrated solutions are also discussed.

Original languageEnglish
Pages (from-to)4737-4741
Number of pages5
JournalJournal of Physical Chemistry B
Issue number18
Publication statusPublished - 10 May 2007


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