The aim of this work was to measure and model highprecision isothermal binary vapor−liquid equilibrium (VLE) phase data for the pentan-2-one + propan-1-ol/butan-1-ol system to aid in the separation process design. P−T−x−y equilibrium measurements were obtained for the pentan-2-one + propan-1-ol system at 342.34, 352.05, and 361.65 K and for the pentan-2-one + butan-1-ol system at 342. 95, 352.65, and 362.55 K at subatmospheric pressures. The data were successfully modeled using the γ−Φ approach by employing the Wilson and nonrandom two-liquid activity coefficient models and the Peng and Robinson equation of state for the vapor correction. Thermodynamic consistency testing with the point and area tests was also performed for the experimental VLE data. The data sets passed both the point test with 0.01 tolerance and the area test with 10% tolerance.

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 twoliquid 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.

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