Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

For the purpose of selecting the effective solvents to separate basic N-compound pyridine from coal tar, three acidic imidazolium-based ILs, 1-butyl-3-methylimidazolium hydrogen sulfate ([Bmim][HSO4]), 1-butyl-3-methylimidazolium dihydrogen phosphate ([Bmim][H2PO4]) and 1-butyl-3-methylimidazolium perchlorate ([Bmim][ClO4]), were chosen for the extraction process. The liquid-liquid equilibrium tie-line data for the ternary systems of ([Bmim][HSO4], [Bmim][H2PO4] and [Bmim][ClO4] + pyridine + methylbenzene) were measured at T = 298.15 K under 101.3 kPa. Meanwhile, the interaction energies between the ILs and pyridine, methylbenzene were calculated. The results indicated that the selected ILs had strong interactions with pyridine than methylbenzene, which were also verified by the distribution ratio and selectivity calculated from the experimental data. In addition, the experimental LLE data were correlated by the NRTL and UNIQUAC models, which the NRTL model showed good agreement than the UNIQUAC. The average RMSD for the NRTL and UNIQUAC models of the investigated systems are 0.0153 and 0.0161, respectively.