摘要
Vapor-liquid equilibrium data of supercritical carbon dioxide +n-hexane system were measured at 313.15 K, 333.15 K, 353.15 K, and 373.15 K and their molar volumes and densities were measured both in the subcritical and supercritical regions ranging from 2.15 to 12.63 MPa using a variable-volume autoclave. The thermodynamic properties including mole fractions, densities, and molar volumes of the system were calculated with an equation of state by Heilig and Franck, in which a repulsion term and a square-well potential attraction term for intermolecular interaction was used. The pairwise combination rule was used to calculate the square-well molecular interaction potential and three adjustable parameters (ω,k_ε,k_σ) were obtained. The Heilig-Franck equation of state is found to have good correlation with binary vapor-liquid equilibrium data of the carbon dioxide +n-hexane system.
Vapor-liquid equilibrium data of supercritical carbon dioxide ＋ n-hexane system were measured at 31.3.15 K, 333.15 K, 353.15 K, and 373. 15 K and their molar volumes and densities were measured both in the subcrJtical and supercritical regions ranging from 2. 15 to 12.63 MPa using a variable-volume autoclave. The thermodynamic properties including mole fractions, densities, and molar volumes of the system were calculated with an equation of state by Heilig and Franck, in which a repulsion term and a square-well potential attraction term for intermolecular interaction was used. The pairwise combination rule was used to calculate the square-well molecular interaction potential and three adjustable parameters （ω, kω, kσ ） were obtained. The Heilig-Franck equation of state is found to have good correlation with binary vapor-liquid equilibrium data of the carbon dioxide ＋ n-hexane system.
