Isothermal Vapor–Liquid Equilibrium (P–T–x–y) Measurements and Modeling of Propan-2-ol + n‑Octane/n‑Decane in the Range of T = 313.2–353.2 K

Vapor–liquid equilibrium measurements (P–T–x–y) are presented for propan-2-ol + n-octane/n-decane mixtures at three temperatures (T = 313.2, 333.2, and 353.2 K) and sub-atmospheric pressures, which were determined by the dynamic method in a recirculating still. The systems exhibit large relative volatilities, with azeotropic behavior observed for the propan-2-ol + n-octane system at all three measured temperatures. The experimental data were modeled using the γ–Φ regression formulation with the non-random two-liquid or UNIQUAC activity coefficient models implemented to describe the non-ideality of the liquid phase and the Hayden and O’Connell correlation in the virial equation of state to describe the non-ideality of the vapor phase. The non-random two-liquid model outperformed the UNIQUAC model in fitting the experimental data. The experimental data were found to be thermodynamically consistent using the area, point, and infinite dilution tests.