Aqueous biphasic systems involving alkylsulfate-based ionic liquids

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The specific effects of K(3)PO(4), K(2)CO(3), Na(2)CO(3), and (NH(4))(2)SO(4), as high charge-density inorganic salts and thus inducers of the formation of aqueous biphasic systems (ABS) containing several ethyl-methylimidazolium alkylsulfate ionic liquids, C(2)MIM C(n)SO(4)(n = 2, 4, 6, or 8), have been assessed at T= 298.15K. The results are analyzed in the light of the Hofmeister series. The influence of different alkyl chain lengths in the anion, together with the ability of the selected inorganic salts to induce the formation of ABS, is discussed. Phase diagrams have been determined through turbidimetry, including tie lines assignments from mass phase ratios according to the lever - arm rule. The Merchuck equation was satisfactorily used to correlate the solubility curve.
Original languageUnknown
Pages (from-to)1565-1572
JournalJournal of Chemical Thermodynamics
Issue number11
Publication statusPublished - 1 Jan 2011

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