Predicting NRTL parameters for binary hydrocarbon mixtures for calculating liquid—vapor equilibriums of multicomponent systems

✍ Scribed by M.J. Huron; J. Vidal; L. Asselineau

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 962 KB
• Volume: 31
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(76)80029-2

✦ Synopsis

Ah&w&The parameters of the NRTL method are fitted, for binary hydrocarbon systems, on the activity coefficients calculated by the Flory-Hildebrand method with binary coefficients ii, of deviation from the geometric mean assumption for cohesive energy densities (NRTL-FH parameters). For aromatic saturated hydrocarbon mixtures, the I,, coefficients are correlated to the products S,S, of solubiity parameters. The predicted NRTL-FH parameters are used in calculations of bubble pressures and vapor phase compositions of binary hydrocarbon mixtures and of ternary mixtures with at least hvo hydrocarbon components. The NRTH-FH method is compared to the Chao-Seader and the zero I,,-Flory-Hildebrand methods for many hydrocarbon systems, and gives the best results among these three predictive methods. The introduction of the non zero &, coefficients is an improvement in regards to the case with zero I*, coefficients, particularly for the cycloparatkaromatic hydrocarbon mixtnres. The NRTL-FH method is also compared to the NRTL-EXP method (parameters fitted on experimental data), and results obtained with the two methods are satisfactory for binary and ternary mixtures.