Liquid−Liquid Equilibria for Benzene Cyclohexane N,N-Dimethylformamide Ammonium Thiocyanate.

Experimental liquid−liquid equilibrium (LLE) data were measured for benzene cyclohexane N,N-dimethylformamide (DMF) ammonium thiocyanate (NH4SCN) at atmospheric pressure and 298.15 K. The experimental data were correlated using the Othmer−Tobias correlation. The selectivity coefficients of DMF NH4SCN 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 NH4SCN in the DMF NH4SCN mixture. Considering the high selectivity for benzene, DMF NH4SCN may be used as a potential extracting solvent for the separation of benzene and cyclohexane. [ABSTRACT FROM AUTHOR]