Critical Assessment of the Formation of Ionic-Liquid-Based Aqueous Two-Phase Systems in Acidic Media
authors Claudio, AFM; Ferreira, AM; Shahriari, S; Freire, MG; Coutinho, JAP
nationality International
journal JOURNAL OF PHYSICAL CHEMISTRY B
keywords BIPHASIC SYSTEMS; 1-BUTYL-3-METHYLIMIDAZOLIUM BROMIDE; MUTUAL SOLUBILITIES; 298.15 K; EXTRACTION; SALTS; WATER; SEPARATION; EQUILIBRIA; PYRIDINIUM
abstract In this work, the ability of Na(2)SO(4) and ionic liquids to induce the formation of acidic aqueous two-phase systems (ATPS) is investigated. Ternary phase diagrams, tie lines, and tie-line lengths for several systems were determined and reported at 298 K and atmospheric pressure. It is here shown that among the ionic liquids studied only those containing long alkyl side chains at the ions and/or anions with low hydrogen bond basicity are capable of undergoing liquid-liquid demixing in the presence of Na(2)SO(4) aqueous solutions. The results obtained indicate that, besides the salting-out ability of the inorganic salt, the pH of the aqueous solution plays a crucial role toward the formation of ionic-liquid-based ATPS. In acidic media the range of ionic liquids that are able to undergo ATPS formation is substantially reduced when compared to alkaline aqueous salt solutions. The use of inorganic salts and ionic liquids to promote acidic ATPS is envisaged as particularly valuable in the extraction of compounds that exhibit low acid dissociation constants.
publisher AMER CHEMICAL SOC
issn 1520-6106
year published 2011
volume 115
issue 38
beginning page 11145
ending page 11153
digital object identifier (doi) 10.1021/jp204865a
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000295057900014
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journal impact factor 3.146
5 year journal impact factor 3.101
category normalized journal impact factor percentile 60.204
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