Javad Saien - Department of Applied Chemistry, Bu-Ali Sina University, Hamedan ۶۵۱۷۴, Iran
Maryam Mozafarvandi
Mahdi Norouzi

In this study, the effect of temperature on liquid-liquid equilibrium (LLE) for the ternary system of water + acetic acid + toluene was investigated at 298.2 and 313.2 K under ambient pressure. Thischemical system is frequently used in liquid-liquid extraction investigations. The results show that distribution coefficient of acetic acid between organic/aqueous phases rises at the higher temperature but separation factor decreases. The acetic acid distribution coefficient is within therange of 0.06-0.1696 and the separation factor within 13.36-59.83. The tie line data for this system are sufficiently correlated by the equations of Othmer-Tobias and Hand. The experimental data were used to obtain binary interaction parameters predicted by Non-Random Two Liquid (NRTL)and Universal Quasi-Chemical (UNIQUAC) models using Aspen Plus simulator. Results show that equilibrium composition can be represented by these models. Root mean square deviation wasused to assess correlating by these models (0.0127and 0.02047, respectively). The NRTL equation was the more accurate model in correlating the equilibrium compositions of the studied system

LLE; Distribution coefficient; Separation factor; NRTL; UNIQUAC