Liquid-liquid equilibria of the ternary system water plus acetic acid+1-heptanol

A liquid-liquid equilibria for the ternary system, water + acetic acid + 1- heptanol, was studied over a temperature range of (288.15-318.15) K. The re sults were used to estimate the LLE interaction parameters for LLE between each of the three compounds for the NRTL and the UNIQUAC equations. The UNI FAC group contribution method has been utilized for predicting the interact ion parameters between each of the H2O, CH2, CH3, OH, and COOH groups as a function of temperature. The UNIQUAC and NRTL equations fit the experimenta l data with a root-mean-square deviation (rmsd) of 0.6% for each. The resul ts of our measurements are compared with the prediction of the UNIFAC metho d with a rmsd of 2.4%.