Binary Mixtures of Ionic Liquids in Aqueous Solution: Towards an Understanding of Their Salting-In/Salting-Out Phenomena
authors Neves, CMSS; Dinis, TBV; Carvalho, PJ; Schroder, B; Santos, LMNBF; Freire, MG; Coutinho, JAP
nationality International
journal JOURNAL OF SOLUTION CHEMISTRY
author keywords Ionic liquids; Solubility; Water; Salting-in effect; Salting-out effect; Hofmeister series
keywords MUTUAL SOLUBILITIES; HOFMEISTER SERIES; BIPHASIC SYSTEMS; WATER; EXTRACTION; SEPARATION; SOLVENTS; COBALT; IMPACT
abstract The order of the salting-in or salting-out inducing ability of ions on the aqueous solubility of macromolecules in aqueous solutions is known as the Hofmeister series. Taking into account that ionic liquids (ILs) are constituted by ions, they can exert similar effects on the solubility of other ILs in aqueous media. To expand the knowledge of the salting-in/-out ability of ILs, experimental studies on the solubility of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonylimide) in water and in the presence of other IL/salts, were conducted at 298.15K and atmospheric pressure. Both the impact of the anion and cation of the IL were evaluated with the following ILs/salts: 1-butyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium hydrogensulfate, cholinium bis(trifluoromethylsulfonyl)imide, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide and lithium bis(trifluoromethylsulfonyl)imide, over a wide composition range. As happens with common salts, both salting-in and salting-out effects exerted by ILs were observed, with a higher impact exerted by the IL anion on the salting-out phenomenon. These data allow better understanding of the ILs impact when designing liquid-liquid separation processes. [GRAPHICS] .
publisher SPRINGER/PLENUM PUBLISHERS
issn 0095-9782
isbn 1572-8927
year published 2019
volume 48
issue 7
beginning page 983
ending page 991
digital object identifier (doi) 10.1007/s10953-018-0836-7
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000478750000005

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