Binary Mixtures of Ionic Liquids in Aqueous Solution: Towards an Understanding of Their Salting-In/Salting-Out Phenomena

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...

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Bibliographic Details
Published in:Journal of solution chemistry 2019-07, Vol.48 (7), p.983-991
Main Authors: Neves, Catarina M. S. S., Dinis, Teresa B. V., Carvalho, Pedro J., Schröder, Bernd, Santos, Luís M. N. B. F., Freire, Mara G., Coutinho, João A. P.
Format: Article
Language:English
Subjects:
Anions
Aqueous solutions
Binary mixtures
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Geochemistry
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Ionic liquids
Ions
Lithium
Macromolecules
Oceanography
Physical Chemistry
Salting
Solubility
Solvents
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Summary: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 298.15 K 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. Graphical Abstract
ISSN:0095-9782
1572-8927
DOI:10.1007/s10953-018-0836-7