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

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Neves, CMSS (Author) Other; Dinis, TBV (Author) Other; Carvalho, PJ (Author) Other; Schroder, B (Author) Other; Luis M N B F Santos (Author) FCUP; Freire, MG (Author) Other; Coutinho, JAP (Author) Other

Journal

Title: Journal of Solution Chemistry

Vol. 48

Pages: 983-991

ISSN: 0095-9782

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 7 Citations

Scopus - 6 Citations

Other information

Authenticus ID: P-00P-XB5

DOI: 10.1007/s10953-018-0836-7

Abstract (EN): 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] .

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9