Vapour-liquid and liquid-liquid phase equilibria of binary mixtures containing helium: comparison of experiment with predictions using equations of state

• Published in: Fluid phase equilibria Vol. 122; no. 1; pp. 1 - 15
• Main Authors: Wei, Ya Song, Sadus, Richard J
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 31.07.1996; Elsevier Science
• Subjects: Binary mixtures; Chemical thermodynamics; Chemistry; Equations of state; Exact sciences and technology; General and physical chemistry; General. Theory; Helium; Liquid-liquid equilibria; Theory; Vapour-liquid equilibria; Equations of state; Binary mixtures; Helium; Theory; Vapour-liquid equilibria; Liquid-liquid equilibria; Methane; Hydrocarbon; Hydrogen; Binary system; Ethylene; Xenon; Theoretical study; Nitrogen; Neon; Thermodynamic model; Liquid vapor equilibrium; Non polar fluid; Argon; Phase equilibrium; Liquid liquid equilibrium; Propane; Interaction parameter
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/0378-3812(96)03045-2

The unlike interaction parameters for binary mixtures of helium + non-polar gases are obtained by comparing experimental critical data with calculations using the Guggenheim and Heilig-Franck equations of state. These interaction parameters and equations of state are used to predict a priori both the vapour-liquid and liquid-liquid equilibria for helium + non-polar gas mixtures. The predicted phase diagrams are compared with experimental data for a wide range of pressure, temperature and composition. Good agreement between theory and experiment is obtained for the isobaric temperature-composition phase behaviour and isothermal pressure-composition phenomena can be predicted qualitatively.