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Int. J. Mol. Sci. 2007, 8(8), 736-748; doi:10.3390/i8080736

Salting-out in Aqueous Solutions of Ionic Liquids and K3PO4: Aqueous Biphasic Systems and Salt Precipitation

1, 1,* , 1, 1 and 1,*
1 Instituto de Tecnologia Química e Biológica, UNL, Av. da República, Apartado 127, 2780-901 Oeiras, Portugal 2 REQUIMTE, Departamento de Quimica, FCT, Universidade Nova de Lisboa, Quinta da Torre, 2829-516 Caparica, Portugal 3 Centro de Química Estrutural, IST-UTL, 1049-001 Lisboa, Portugal
* Authors to whom correspondence should be addressed.
Received: 18 June 2007 / Revised: 25 July 2007 / Accepted: 27 July 2007 / Published: 31 July 2007
(This article belongs to the Special Issue Ionic Liquids)
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The salting-out effect produced by the addition of potassium phosphate, K3PO4to aqueous solutions of water-miscible ionic liquids, viz. 1-ethyl-3-methylimidazoliumethyl sulfate, 1-butyl-3-methylimidazolium methyl sulfate, or 1-alkyl-3-methylimidazolium chloride (alkyl = butyl, octyl or decyl) is investigated. The effects areanalyzed using both the corresponding temperature–composition pseudo-binary andcomposition ternary phase diagrams. Different regions of liquid-liquid and solid-liquidphase demixing are mapped. The phase behavior is interpreted taking into account thecomplex and competing nature of the interactions between the ionic liquid, the inorganicsalt and water. In the case of solutions containing 1-octyl- or 1-decyl-3-methylimidazoliumchloride, the smaller magnitude of the salting-out effects is explained in terms of thepossibility of self-aggregation of the ionic liquid.
Keywords: ionic liquid; inorganic salt; salting-out effect; aqueous biphasic systems. ionic liquid; inorganic salt; salting-out effect; aqueous biphasic systems.
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Najdanovic-Visak, V.; Lopes, J.N.C.; Visak, Z.P.; Trindade, J.; Rebelo, L.P.N. Salting-out in Aqueous Solutions of Ionic Liquids and K3PO4: Aqueous Biphasic Systems and Salt Precipitation. Int. J. Mol. Sci. 2007, 8, 736-748.

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