TY - JOUR
T1 - Salting-out effects in aqueous ionic liquid solutions
T2 - Cloud-point temperature shifts
AU - Trindade, Joana R.
AU - Visak, Zoran P.
AU - Blesic, Marijana
AU - Marrucho, Isabel M.
AU - Coutinho, João A.P.
AU - Canongia Lopes, José N.
AU - Rebelo, Luis P.N.
PY - 2007/5/10
Y1 - 2007/5/10
N2 - The effects of the addition of three inorganic salts, namely, NaCl, Na 3SO4, and Na3PO4, on the liquid-liquid (L-L) phase diagram of aqueous solutions containing the model ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate, [bmim][BF 4], were investigated. All three inorganic salts trigger salting-out effects, leading to significant upward shifts of the L-L demixing temperatures of the systems. The magnitude of the shifts depends on both the water-structuring nature of the salt and its concentration; that is, the effects are correlated with the ionic strength of the solution and the Gibbs free energy of hydration of the inorganic salt. The pH effect and the occurrence of salt precipitation in concentrated solutions are also discussed.
AB - The effects of the addition of three inorganic salts, namely, NaCl, Na 3SO4, and Na3PO4, on the liquid-liquid (L-L) phase diagram of aqueous solutions containing the model ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate, [bmim][BF 4], were investigated. All three inorganic salts trigger salting-out effects, leading to significant upward shifts of the L-L demixing temperatures of the systems. The magnitude of the shifts depends on both the water-structuring nature of the salt and its concentration; that is, the effects are correlated with the ionic strength of the solution and the Gibbs free energy of hydration of the inorganic salt. The pH effect and the occurrence of salt precipitation in concentrated solutions are also discussed.
UR - http://www.scopus.com/inward/record.url?scp=34249710740&partnerID=8YFLogxK
UR - https://pubs.acs.org/doi/10.1021/jp067022d
U2 - 10.1021/jp067022d
DO - 10.1021/jp067022d
M3 - Article
AN - SCOPUS:34249710740
VL - 111
SP - 4737
EP - 4741
JO - Journal of Physical Chemistry: Part B
JF - Journal of Physical Chemistry: Part B
SN - 1520-6106
IS - 18
ER -