The
ionic liquids 1-butyl-1-methylpyrrolidinium trifluoromethanesulfonate,
[BMpyr][TfO], 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide,
[BMpyr][NTf2], and 1-butyl-1-methylpyrrolidinium dicyanamide,
[BMpyr][DCA], have been studied as solvents for the extraction of
benzene from its mixtures with several aliphatic hydrocarbons. The
liquid–liquid equilibrium (LLE) of the ternary systems {octane
(1) + benzene (2) + [BMpyr][TfO] (3)}, {decane (1) + benzene (2) +
[BMpyr][TfO] (3)}, {dodecane (1) + benzene (2) + [BMpyr][TfO] (3)},
{dodecane (1) + benzene (2) + [BMpyr][NTf2] (3)}, and {dodecane
(1) + benzene (2) + [BMpyr][DCA] (3)} at T = 298.15
K and atmospheric pressure was carried out. The solute distribution
ratio and selectivity values derived from the tie-lines were used
to evaluate if the studied ionic liquids can be used as extraction
solvents, and the obtained values were compared with those found in
the literature for the traditional organic solvents. Finally, experimental
LLE data for the ternary mixtures were correlated by means of the
non-random two-liquid (NRTL) thermodynamic model.
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