Liquid−Liquid Equilibrium Studies on Toluene + Heptane + Solvent

Liquid−liquid equilibria of the ternary systems toluene−heptane−tetraethylene glycol, toluene−heptane−N−formylmorpholine, toluene−heptane−(tetraethylene glycol + N-formylmorpholine), and toluene−heptane−(tetraethylene glycol + N-methylpyrrolidone) have been determined at 40 °C. The capacity and selectivity data of the solvent systems were obtained and compared. The data were correlated using Bachman, Othmer−Tobias, and Hand models.