Liquid–liquid equilibria of multi-component systems including n-hexane, n-octane, benzene, toluene, xylene and sulfolane at 298.15 K and atmospheric pressure

Liquid–liquid equilibrium (LLE) data were measured at 298.15 K and atmospheric pressure for six ternary systems: n-hexane+benzene+sulfolane,n-hexane+toluene+sulfolane,n-hexane+xylene+sulfolane,n-octane+benzene+sulfolane,n-octane+toluene+sulfolane,n-octane+xylene+sulfolane; three quaternary systems:n-hexane+n-octane+benzene+sulfolane,n-hexane+benzene+toluene+sulfolane and n-octane+toluene+xylene+sulfolane; one quinary system:n-hexane+n-octane+benzene+toluene+sulfolane. The equilibrium data of ternary systems were used to regress interaction parameters in non-random two-liquid (NRTL) equation. These parameters were directly used to predict equilibrium data of quaternary and quinary systems. The predicted data are in good agreement with experimental data.