Ternary liquid-liquid equilibria for systems of (sulfolane plus toluene or chloronaphthalene plus octane)

Tie-line data for ternary systems of ( sulfolane + toluene + octane) at temperatures of 303.2 K and 313.2 K and ( sulfolane + chloronaphthalene + octane) at temperatures of 298.2 K and 303.2 K are reported. The composition of liquid phases at equilibrium was determined by gas-liquid chromatography, and the results were correlated with the UNIQUAC and NRTL activity coefficient models to obtain the binary interaction parameters. Both the UNIQUAC and the NRTL models satisfactorily correlated the equilibrium compositions. The partition coefficients and the selectivity factor of sulfolane for extraction of toluene and chloronaphthalene from octane-containing systems are calculated. Then the efficiency of the extraction of toluene from the ( toluene + octane) mixture is compared with that for the extraction of chloronaphthalene from the ( chloronaphthalene + octane) mixture by using the calculated selectivity factors and the partition coefficients of the used solvent. The phase diagrams for the ternary systems are presented, and the correlated tie-line results have been compared with the experimental data.