The separation of cyclopentanone from aqueous solutions with recommended (propan-2-yl) benzene (cumene) solvent was investigated at different temperatures of 293.2, 298.2, and 308.2 K and with the effect of NaCl, Na2SO4, and MgSO4 salts. In a wide mass fraction range of cyclopentanone, the solute distribution coefficients and separation factors were within (1.554−5.992) and (75.85−1944.97), respectively. The high separation factors corresponded to low solute concentrations and low temperatures. The effect of salts was investigated, and enhancements in the separation factor were achieved up to 24.7, 39.9, and 49.3% with 0.01 mass fraction of, respectively, NaCl, Na2SO4, and MgSO4 in an aqueous phase. This order of salt effectiveness is consistent with the Gibbs free energy for the hydration of the constituent ions. The consistency of LLE data for the employed system, with and without salts, was ascertained with corresponding equations. For the modeling of obtained data, the well-known activity coefficient models of NRTL and UNIQUAC were used, and binary interaction parameters were determined. High accuracy of the models was revealed with root-mean-square deviations of less than 0.0053 and 0.0069, respectively.
