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Molecules 2019, 24(5), 894; https://doi.org/10.3390/molecules24050894

Extraction of Acids and Bases from Aqueous Phase to a Pseudoprotic Ionic Liquid

1
Department of Chemical Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
2
Department of Chemistry, Brooklyn College of the City University of New York, 2900 Bedford Ave., Brooklyn, NY 10314, USA
3
Department of Chemistry, Graduate Center of the City University of New York, 365 Fifth Ave., New York, NY 10016, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Eric Guibal and Mark L. Dietz
Received: 23 January 2019 / Revised: 14 February 2019 / Accepted: 27 February 2019 / Published: 4 March 2019
(This article belongs to the Special Issue Ionic Liquids in Chemical Separations: Promise and Prospects)
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Abstract

We report experiments on the extraction of acids and bases from an aqueous phase to a pseudoprotic ionic liquid phase consisting of an equimolar mixture of trihexylamine and octanoic acid. We observed the extraction of a wide range of acids and bases, and investigated the mechanism of extraction in detail. Our results confirmed the observation of the Hofmeister effect in these systems reported in our previous work, where the extent of the extraction of copper salts was significantly influenced by the interactions between extracted inorganic anions and the organic phase. Our results further demonstrated that the organic layer served as a “floating buffer” capable of stabilizing the pH of an acidic or alkaline aqueous phase. The results tie current interest in protic and pseudoprotic ionic liquids to earlier work on the extraction of acids using amine and acid–base couples as extraction agents in an inert organic solvent. View Full-Text
Keywords: protic ionic liquids; acid extraction; Hofmeister effect protic ionic liquids; acid extraction; Hofmeister effect
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Patsos, N.; Lewis, K.; Picchioni, F.; Kobrak, M.N. Extraction of Acids and Bases from Aqueous Phase to a Pseudoprotic Ionic Liquid. Molecules 2019, 24, 894.

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