Liquid–liquid equilibria for ternary mixtures of 2,2-dimethyl-1,3-dioxolane-4-methanol with n-heptane, toluene, ethanol and water

Abstract Liquid–liquid equilibria (LLE) data are presented for three ternary systems: 2,2-dimethyl-1,3-dioxolane-4-methanol (DMDM) +  n -heptane + ethanol, and DMDM +  n -heptane (or toluene) + water. The most of the measurements were performed at 293.15 K and atmospheric pressure, some data obtained relate to 273.15 K. The phase diagrams for the ternary system containing n -heptane and water show the extended heterogeneous area between the water–hydrocarbon side of the concentration triangle and the n -heptane-DMDM side. Much smaller regions of immiscibility with the critical points are observed for the ternary mixtures DMDM + toluene + water and DMDM +  n -heptane + ethanol. The experimental LLE data were correlated applying the NRTL model. The UNIFAC interaction parameters for CH 2 O groups of DMDM were estimated on the base of LLE in the DMDM +  n -heptane + ethanol system. The UNIFAC model was applied to predict the LLE diagrams for ternary DMDM +  n -heptane (or toluene) + water solutions. Both NRTL and UNIFAC models with the estimated parameters have provided satisfactory results.