Ternary (Liquid + Liquid) Equilibrium Experiment and Thermodynamic Modeling for Solvents (p-Xylene, Mesityl Oxide) + 2-Butanone + Water at 298.2, 303.2, and 313.2 K under 101.3 kPa

For separating 2-butanone and water from the azeotropic system, the liquid–liquid equilibria (LLE) data for the ternary mixture of solvents (p-xylene, mesityl oxide) + 2-butanone + water at 298.2, 303.2, and 313.2 K were obtained under 101.3 kPa. The distribution coefficient (D) and selectivity coefficient (S) were used to evaluate the effect of extracting 2-butanone from water, it is found that p-xylene is better than mesityl oxide. The Bachman and Othmer–Tobias equations were used to verify the reliability of the LLE data with the linear coefficient being greater than 0.98%. The NRTL and UNIQUAC models successfully correlated the experimental data with the root mean square deviation values less than 0.87 and 0.50%, respectively. It shows that the UNIQUAC is more suitable for this system than the NRTL model.