(Liquid + liquid) equilibrium for ternary mixtures of {heptane + aromatic compounds + [EMpy][ESO 4]} at T = 298.15 K

► This paper reports the LLE data of ternary systems {heptane (1) + aromatic compounds (2) + [EMpy][ESO 4] (3)}. ► The distribution coefficient and the selectivity were obtained from the experimental data. ► The consistency of LLE data was successfully correlated with Othmer–Tobias and Hand equation. (Liquid + liquid) equilibrium (LLE) data for the ternary systems (heptane + toluene + 1-ethyl-3-methylpyridinium ethylsulfate) and (heptane + benzene + 1-ethyl-3-methylpyridinium ethylsulfate) were measured at T = 298.15 K and atmospheric pressure. The selectivity and aromatic distribution coefficients, calculated from the equilibrium data, were used to determine if this ionic liquid can be used as a potential extracting solvent for the separation of aromatic compounds from heptane. The consistency of tie-line data was ascertained by applying the Othmer–Tobias and Hand equations.