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

Abstract

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.

Vapor–Liquid Equilibrium (P–T–x–y) Measurements and Modeling of propan-1-ol/propan-2-ol + oct-1-ene in the Range of T = (313.2–353.2) K

“…It can be observed that the azeotrope composition shifts toward the propanol-rich region with increasing temperature for both systems. Similar behavior was observed in recent previous work for the system propan-2-ol (1) + n -octane (2) …”

“…The nonideality of the systems is again indicated by the significant ratios between γ 1 ∞ and γ 2 ∞ at each temperature. This behavior is typical of alcohol–nonpolar hydrocarbon systems. , …”

Solubility Measurement of Cholesterol in Several Solvents from 283.2 to 323.2 K

“…The UNIQUAC model has been widely used in vapor–liquid equilibrium, liquid–liquid equilibrium, and solid–liquid equilibrium . This work adopts the modified UNIQUAC to calculate the solubility data .…”