Solubility of Alkali Metal Halides in the Ionic Liquid [C4C1im][OTf]

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Title: Solubility of Alkali Metal Halides in the Ionic Liquid [C4C1im][OTf]
Authors: Hunt, PA
Welton, T
Hallett, J
Schmauck, J
Bordes, E
Kuzmina, O
Item Type: Journal Article
Abstract: The solubilities of the metal halides LiF, LiCl, LiBr, LiI, NaF, NaCl, NaBr, NaI, KF, KCl, KBr, KI, RbCl, CsCl, CsI, were measured at temperatures ranging from 298.15 to 378.15 K in the ionic liquid 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([C4C1im][OTf]). Li(+), Na(+) and K(+) salts with anions matching the ionic liquid have also been investigated to determine how well these cations dissolve in [C4C1im][OTf]. This study compares the influence of metal cation and halide anion on the solubility of salts within this ionic liquid. The highest solubility found was for iodide salts, and the lowest solubility for the three fluoride salts. There is no outstanding difference in the solubility of salts with matching anions in comparison to halide salts. The experimental data were correlated employing several phase equilibria models, including ideal mixtures, vant Hoff, the λh (Buchowski) equation, the modified Apelblat equation, and the non-random two-liquid model (NRTL). It was found that the vant Hoff model gave the best correlation results. On the basis of the experimental data the thermodynamic dissolution parameters (ΔH, ΔS, and ΔG) were determined for the studied systems together with computed gas phase metathesis parameters. Dissolution depends on the energy difference between enthalpies of fusion and dissolution of the solute salt. This demonstrates that overcoming the lattice energy of the solid matrix is the key to the solubility of inorganic salts in ionic liquids.
Issue Date: 24-May-2016
Date of Acceptance: 23-May-2016
URI: http://hdl.handle.net/10044/1/33096
DOI: https://dx.doi.org/10.1039/C6CP02286C
ISSN: 1463-9084
Publisher: Royal Society of Chemistry
Start Page: 16161
End Page: 16168
Journal / Book Title: Physical Chemistry Chemical Physics
Volume: 18
Copyright Statement: © The Royal Society of Chemistry 2016
Keywords: Chemical Physics
02 Physical Sciences
03 Chemical Sciences
Publication Status: Published
Appears in Collections:Faculty of Engineering
Chemistry
Catalysis and Advanced Materials
Chemical Engineering
Faculty of Natural Sciences



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