Toward an Understanding of the Mechanisms behind the Formation of Liquid-liquid Systems formed by Two Ionic Liquids
authors Neves, CMSS; Silva, AMS; Fernandes, AM; Coutinho, JAP; Freire, MG
nationality International
journal JOURNAL OF PHYSICAL CHEMISTRY LETTERS
keywords SOLVENT-EXTRACTION; EXTENDED SCALE; SEPARATION; MIXTURES; STABILITIES; NICKEL; MEDIA
abstract Biphasic systems composed of aprotic ionic liquids (ILs) allow the development of new separation processes constituted only by nonvolatile solvents. Six pairs of cholinium- and phosphonium-based Its were found to be able to form biphasic systems, and the respective liquid-liquid phase diagrams were determined. Although IL anions do not seem to control the phase separation phenomenon, they play an important role in defining the size of the biphasic region. A linear dependence of the ILs mutual solubilities with the IL anions volume was found, supporting the relevance of the entropy of mixing. With the exception of the system formed by ILs with a common anion, the remaining liquid-liquid systems display a significant ion exchange extent between the phases, which inversely depends on the ILs cohesive energy. It is finally shown that four-phase systems with a remarkable performance in the separation of mixtures of dyes can be prepared.
publisher AMER CHEMICAL SOC
issn 1948-7185
year published 2017
volume 8
issue 13
beginning page 3015
ending page 3019
digital object identifier (doi) 10.1021/acs.jpclett.7b01234
web of science category Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Atomic, Molecular & Chemical
subject category Chemistry; Science & Technology - Other Topics; Materials Science; Physics
unique article identifier WOS:000405252600039
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journal impact factor 6.71
5 year journal impact factor 7.811
category normalized journal impact factor percentile 82.032
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