Liquid-liquid equilibria (LLE) data of five ternary systems of sulfide + octane + solvents were measured at 313.15 K 323.15 K, and 333.15 K, respectively, under atmospheric pressure. Dimethyl sulfoxide, sulfolane, and tetraethylene glycol were used as solvents, respectively. The distribution of sulfide (thiophene, n-butyl mercaptan, n-dibutyl sulfide) between the extract phase and the raffinate phase was obtained. The experimental data were correlated through the well-known NRTL and UNIQUAC models for the activity coefficient, and the model parameters were estimated using the simplex minimization method and a composition-based objective function. The results were analyzed in terms of average absolute deviations between experimental and calculated mass percentage of thiophene, n-butyl mercaptan, and n-dibutyl sulfide. The results were considered satisfactory, with the NRTL model yielding a better representation of the equilibria data for the systems studied. The two models were suitable for calculating the LLE data of these systems.