Determination and Correlation of Liquid-Liquid Equilibria Data for Water plus Cyclohexanol plus (Mesityl Oxide, Toluene, and p-Xylene) Ternary Systems at Different Temperatures

Accurate liquid-liquid equilibria (LLE) data are of momentous significance for the design, simulation, as well as optimization of the extractive process. To assemble the essential data for the operation of extracting cyclohexanol from the aqueous solution, LLE data for {water + cyclohexanol + toluene}, {water + cyclohexanol + mesityl oxide}, and {water + cyclohexanol + p-xylene} ternary systems were experimentally measured at 303.15 and 323.15 K under 101.3 kPa. The separating power of the extractants was assessed via the distribution coefficient and selectivity. The Othmer-Tobias and Bachman equations were applied to confirm the experimental data coherence. The data obtained from experiments were correlated via the nonrandom two liquid (NRTL) and universal quasi-chemical (UNIQUAC) models, and the regression result was better since the RMSD values were all less than 0.2%. However, the UNIQUAC model was preferable since the RMSD was smaller. In addition, the relevant binary interaction parameters were also generated during the relevant correlations.