Liquid–liquid equilibrium for the system water + 1,4-dioxane + cyclohexanol over the temperature range of 313.2–343.2 K

Cyclohexanol is an important chemical intermediate in nylon production. A new route, using a cosolvent for cyclohexanol production by direct hydration of cyclohexene in a reactive distillation column, was put forward. Liquid–liquid equilibrium (LLE) data for the ternary system water + 1,4-dioxane + cyclohexanol were investigated experimentally at 1 atm over the temperature range of (313.2–343.2) K. The Othmer–Tobias correlation was used to determine the reliability of the experimental tie-lines. The measured LLE data were compared with the values correlated by the nonrandom two-liquids (NRTL) and improved UNIQUAC models. It was found that both the NRTL and improved UNIQUAC models could provide good correlation results for this system. The NRTL and UNIQUAC equations were fitted to the experimental data with a root-mean-square deviation (RMSD%) of less than 0.19 and 0.41, respectively.