Determination and Correlation of Liquid-Liquid Equilibria Data for Ternary System Isopropyl Acetate plus Isopropanol plus Water at Different Temperatures

The liquid-liquid equilibrium (LLE) data for the (isopropyl acetate + isopropanol + water) ternary system were determined experimentally using an equilibrium cell from 298.15 to 323.15 K at 101.3 kPa to obtain the fundamental data guiding the separation process of isopropyl acetate and isopropanol mixtures. The solvents' extraction capacity was assessed by the solute distribution coefficient and selectivity. Othmer-Tobias and Bachman correlations for tie lines were used to assess the smoothed trend of the measured data. Thermodynamic models NRTL and UNIQUAC were used to correlate experimental data and obtain relevant binary interaction parameters. Both models provided good descriptions of the studied systems with root mean-square deviations (RMSDs) of less than 0.2%. Moreover, a lower RMSD was found for the UNIQUAC model, demonstrating that it can correlate the experimental data successfully.