Prediction of the thermodynamic properties and the phase behavior of binary mixtures in the extended critical region

• Published in: Fluid phase equilibria Vol. 128; no. 1; pp. 1 - 28
• Main Author: Kiselev, S.B
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 1997; Elsevier Science
• Subjects: Binary mixtures; Chemical thermodynamics; Chemistry; Critical phenomena; Crossover equation of state; Dilute aqueous solutions; Ethane; Exact sciences and technology; General and physical chemistry; General. Theory; Methane; n-Butane; Phase behavior; Sodium chloride; Thermodynamic properties; Methane; n-Butane; Dilute aqueous solutions; Crossover equation of state; Binary mixtures; Critical phenomena; Phase behavior; Thermodynamic properties; Sodium chloride; Ethane; Critical property; Hydrocarbon; Dew point; Binary system; Heat capacity; Critical region; Physical properties; Free energy; Sound velocity; Butane; Critical pressure; Equations of state; Bubble point; Thermodynamic model; Alkane; Dilute solution; Mass density; Aqueous solution; Critical temperature; Sodium Chlorides
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/S0378-3812(96)03173-1

A new parametric crossover equation of state for pure fluids and binary mixtures, which incorporates the scaling laws asymptotically close to the critical point and is transformed into the regular classical expansion far away from the critical point, is proposed. A comparison is made with the experimental data for pure methane, ethane and n-butane, and for binary mixtures of methane and ethane, and of ethane and n-butane. The equation of state yields a satisfactory representation of the thermodynamic property data in a large range of temperatures and densities. An application for dilute aqueous sodium chloride solutions is also discussed.