Effect of Methanol Concentration in the Mixed Solvent Dimethyl Sulfoxide plus Methanol in the Extraction of Toluene from Heptane: Experimental Measurements and Thermodynamic Modeling

In this paper, liquid-liquid phase equilibrium data were measured for quaternary systems containing dimethyl sulfoxide + mass fraction of methanol as mixed solvent, toluene as aromatic hydrocarbon and heptane as fuel model at 298.15 K under ambient pressure. The selectivity and the distribution coefficient calculated from the experimental data were used to examine the possibility of adding methanol to dimethyl sulfoxide for extraction of toluene from heptane. Liquid samples were characterized by gas chromatography. The reliability of the experimental LLE data were examined by Othmer-Tobias and Hand methods. The non-random two-liquid model was used to correlate experimental data and fitting parameters were reported.