Mutual solubilities of pyridinium-based tetrafluoroborates (namely, 1-butylpyridinium tetrafluoroborate, 1-butyl-2-methylpyridinium tetrafluoroborate, 1-butyl-4-methylpyridinium tetrafluoroborate, and 1-hexylpyridinium tetrafluoroborate) and toluene were obtained at (298.15, 318.15, and 338.15) K. The data were acquired by means of an experimental procedure utilizing gas chromatography and a gravimetric method. The results show that the liquid-liquid equilibrium in the studied systems is strongly asymmetrical. While the mole fraction solubility of the pyridinium-based ionic liquids in toluene ranges from 1.0 · 10 -5 to 5.2 · 10 -5 , the solubility of toluene in these ionic liquids varies from 0.318 to 0.579 in mole fraction. The experimental data were correlated with a semiempirical equation. Parameters of the nonrandom two-liquid (NRTL) equation were evaluated as well.
Liquid-liquid equilibrium (LLE) data in ternary systems ethylene glycol þ toluene þ ethyl acetate, ethylene glycol þ anisole þ ethyl acetate, and ethylene glycol þ acetophenone þ ethyl acetate were measured at 298.15 K. The experimental data were utilized to adjust the parameters of the nonrandom two-liquid (NRTL) equation. The Othmer-Tobias plot of the LLE data shows that the system ethylene glycol þ acetophenone þ ethyl acetate exhibits a less common behavior.
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