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Theextraction of benzene from heptane by the solvents such as N,N-dimethylformamide (DMF), propylene carbonate, and complexsolvent (DMF + propylene carbonate) were researched. The liquid–liquidequilibrium (LLE) data were experimentally obtained for the ternarysystems heptane + benzene + DMF and heptane + benzene + propylenecarbonate at 313.2 K and atmospheric pressure and for the quaternarysystems heptane + benzene + DMF + propylene carbonate at (303.2, 313.2,and 323.2) K and atmospheric pressure. The nonrandom two-liquid (NRTL)and universal quasichemical activity coefficient (UNIQUAC) modelswere used to correlate the LLE data satisfactorily, and the selectivityand distribution coefficients of benzene were calculated. Due to itshigh selectivity and suitable distribution coefficient, DMF + propylenecarbonate can be used as a potential extracting solvent to separatebenzene from heptane. [ABSTRACT FROM AUTHOR]