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

Vapor–liquid equilibrium measurements (<i>P</i>–<i>T</i>–<i>x</i>–<i>y</i>) are presented for propan-2-ol + <i>n</i>-octane/<i>n</i>-decane mixtures at three temperatures (<i>T</i> = 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 + <i>n</i>-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.