Measurement and prediction of liquid-liquid equilibria in ternary systems containing water, an organic component, and cyclohexanol

Abstract

The liquid-liquid equilibria of the four ternary mixtures water + heptane + cyclohexanol, water + toluene + cyclohexanol, water + cyclohexane + cyclohexanol, and water + cyclohexylamine + cyclohexanol were measured at 298.15 K and 323.15 K at atmospheric pressure. The binodal curves were determined by photometric turbidity titration.Our experimental data are compared with the prediction results from both UNIQUAC and NRTL activity coefficient models and the equation of state proposed by Elliott, Suresh, and Donohue (ESD EOS). For this purpose, interaction parameters were determined using binary phase equilibrium data. Due to the sparse amount of binary equilibrium data in literature, the vapour-liquid equilibrium in the binary toluene + cyclohexanol system was determined at 333.15 K and 363.15 K at reduced pressure. When predicting the experimental LLE behaviour of the considered systems, ESD EOS seems to be superior to the UNIQUAC and NRTL approach.