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Experimental liquid-liquid equilibrium (LLE) data were measured for benzene + cyclohexane + N,Ndimethylformamide (DMF) + potassium thiocyanate (KSCN) at atmospheric pressure and 303.15 K. The experimental data was correlated using the Othmer-Tobias correlation. The selectivity coefficients of DMF + KSCN for benzene are 2 to 11 in this work. The results revealed that the selectivity coefficients increased with the decrease in concentration of benzene in the raffinate and increased with the increase of the mass fraction of KSCN in the DMF + KSCN mixture. Considering the high selectivity for benzene, DMF + KSCN may be used as a potential extracting solvent for the separation of benzene and cyclohexane.

Experimental liquidÀliquid equilibrium (LLE) data were measured for benzene þ cyclohexane þ N,N-dimethylformamide (DMF) þ ammonium thiocyanate (NH 4 SCN) at atmospheric pressure and 298.15 K. The experimental data were correlated using the OthmerÀTobias correlation. The selectivity coefficients of DMF þ NH 4 SCN for benzene are 2 to 15 in this work. The results revealed that the selectivity coefficients increased with the decreasing of the concentration of benzene in the raffinate and increased with the increasing of the mass fraction of NH 4 SCN in the DMF þ NH 4 SCN mixture. Considering the high selectivity for benzene, DMF þ NH 4 SCN may be used as a potential extracting solvent for the separation of benzene and cyclohexane.

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The liquid−liquid equilibrium (LLE) data for the system of benzene + cyclohexane + N,N-dimethylacetamide (DMAc) + ammonium thiocyanate were measured experimentally at 298.15 K and atmospheric pressure. All the data were correlated by the nonrandom two liquid model and they matched well. The highest selectivity coefficients of the complex solvent (DMAc + NH 4 SCN) can reach 12.39 at 298.15 K, which is close to that of some ionic liquids. To investigate its similarity to ionic liquids, the complex solvent was tested for electrical conductivity, and the results show that the solvent is conductive, which means there are a lot of ions in the system. The existence of ions may help to extract benzene from cyclohexane, a theory which needs to be researched further in the future.