Backone family of equations of state: 1. Nonpolar and polar pure fluids

✍ Scribed by Andreas Müller; Jochen Winkelmann; Johann Fischer

• Publisher: American Institute of Chemical Engineers
• Year: 1996
• Tongue: English
• Weight: 1000 KB
• Volume: 42
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690420423

✦ Synopsis

Abstract

The Helmholtz energy F is written as the sum F = F~H~ + F~A~ + F~Pol~, where F~H~ is the hard‐body contribution, F~A~ the attractive dispersion force contribution, and F~Pol~ either the quadrupolar or dipolar contribution. Here, a new expression for F~A~ is constructed by a simultaneous correlation of experimental data of methane, oxygen, and ethane. The resulting equations for F with only three or four substance‐specific parameters are tested for several nonpolar, quadrupolar, and dipolar fluids. In the correlation of large data sets good results are obtained. The significance of the approach, however, is in the good to excellent prediction of all thermodynamic properties in the whole fluid region based on a parameter fit to only four experimental data—two vapor pressures and two saturated liquid densities.