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Salting-out in Aqueous Solutions of Ionic Liquids and K3PO4: Aqueous Biphasic Systems and Salt Precipitation
Instituto de Tecnologia Química e Biológica, UNL, Av. da República, Apartado 127, 2780-901 Oeiras, Portugal
REQUIMTE, Departamento de Quimica, FCT, Universidade Nova de Lisboa, Quinta da Torre, 2829-516 Caparica, Portugal
Centro de Química Estrutural, IST-UTL, 1049-001 Lisboa, Portugal
* Authors to whom correspondence should be addressed.
Received: 18 June 2007; in revised form: 25 July 2007 / Accepted: 27 July 2007 / Published: 31 July 2007
Abstract: 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.
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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.
Najdanovic-Visak V, Lopes JNC, Visak ZP, Trindade J, Rebelo LPN. Salting-out in Aqueous Solutions of Ionic Liquids and K3PO4: Aqueous Biphasic Systems and Salt Precipitation. International Journal of Molecular Sciences. 2007; 8(8):736-748.
Najdanovic-Visak, Vesna; Lopes, José N.C.; Visak, Zoran P.; Trindade, J.; Rebelo, Luís P.N. 2007. "Salting-out in Aqueous Solutions of Ionic Liquids and K3PO4: Aqueous Biphasic Systems and Salt Precipitation." Int. J. Mol. Sci. 8, no. 8: 736-748.