Non-random two-liquid modelling of switchable-hydrophilicity solvent systems: N,N-Dimethylcyclohexanamine, water, and toluene

Liquid–liquid phase equilibrium data for the ternary system of (water + N,N-dimethylcyclohexanamine + toluene) and the quaternary system of (water + N,N-dimethylcyclohexanamine + toluene + N,N-dimethylcyclohexanammonium bicarbonate) were collected at 303.15 K and atmospheric pressure. The experimental data for the ternary system were correlated by the Othmer-Tobias equation and Hand equation. The experimental data were compared with the results fit to the non-random two-liquid model. The distribution coefficients and separation factor values were evaluated for the immiscibility regions and their implications for switchable-hydrophilicity solvent based separations are discussed.