Experimental Measurements and Correlation of Liquid Extraction of o-Xylene from Octane Using Mixed Solvents Including Dimethyl Sulfoxide and Methanol at 298.15 K

The purpose of the present work is to study the effect of adding different mass quantities of a light alcohol (methanol) to dimethyl sulfoxide, in order to extract o-xylene from octane. Experimental liquid-liquid equilibrium data for the quaternary systems {octane + o-xylene + dimethyl sulfoxide + (0.2, 0.4, 0.6, and 0.8) mass fraction of methanol} were determined at T = 298.15 K under atmospheric pressure. For the four quaternary systems, the selectivity and distribution coefficient of o-xylene were applied to assess the efficacy of (dimethyl sulfoxide + mass fraction of methanol) as mixed solvents. The triangular phase diagrams for all studied systems were sketched. The Non Random Two-Liquid activity coefficient model was employed to correlate experimental results and fitting parameters were reported.