Liquid–Liquid\nEquilibria of Benzene + <i>n</i>‑Heptane + <i>N</i>,<i>N</i>‑Dimethylformamide and Benzene\n+ <i>n</i>‑Heptane\n+ <i>N</i>,<i>N</i>‑Dimethylformamide +\nAmmonium Thiocyanate

Abstract

The liquid–liquid equilibrium\ndata for the systems including\nbenzene + <i>n</i>-heptane + <i>N</i>,<i>N</i>-dimethylformamide (DMF) and benzene + <i>n</i>-heptane + DMF + ammonium thiocyanate were measured experimentally\nat 298.15 K or 303.15 K and atmospheric pressure. The selectivity\ncoefficients of the complex solvent (DMF + NH₄SCN) are\ngenerally higher than those of DMF, derived from the tie-line data.\nFor the high selectivity that is from 15.03 to 69.90 at 298.15 K or\nfrom 15.04 to 61.02 at 303.15 K, the complex solvent, DMF + NH₄SCN, could be used as an extracting agent to separate benzene\nfrom <i>n</i>-heptane.