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    Liquid–Liquid Equilibria of Benzene + <i>n</i>‑Heptane + <i>N</i>,<i>N</i>‑Dimethylformamide and Benzene + <i>n</i>‑Heptane + <i>N</i>,<i>N</i>‑Dimethylformamide + Ammonium Thiocyanate

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    The liquid–liquid equilibrium data for the systems including benzene + <i>n</i>-heptane + <i>N</i>,<i>N</i>-dimethylformamide (DMF) and benzene + <i>n</i>-heptane + DMF + ammonium thiocyanate were measured experimentally at 298.15 K or 303.15 K and atmospheric pressure. The selectivity coefficients of the complex solvent (DMF + NH<sub>4</sub>SCN) are generally higher than those of DMF, derived from the tie-line data. For the high selectivity that is from 15.03 to 69.90 at 298.15 K or from 15.04 to 61.02 at 303.15 K, the complex solvent, DMF + NH<sub>4</sub>SCN, could be used as an extracting agent to separate benzene from <i>n</i>-heptane