Mixing rules and excess properties in cubic equations of state

✍ Scribed by Jean Vidal

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 431 KB
• Volume: 33
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(78)80059-1

✦ Synopsis

The lunitahons Implied by usmg conventIonal quadratIc mlxmg rules for Redhch-Kwong's modified equations of state are studied A close relation IS shown between these rules and the regular solutions behavlour Alternate mlxmg rules for the energy parameters a/b are proposed allowmg for dataevaluatlon and correlation of Polar systems INTROWCTlON Cubic equations of state, such as ( p+ a(T) v(v (u--b)=RT > (1) are now extensively used in liquid vapor equilibria calculations Pure components parameters a,, and b,, can beobtained from vapor pressure values and critical conditions as IS done, for example, by Soave [ l] For a mixture a and b are usually calculated from pure components parameters, binary parameters a,, and b,,, and mtxtng rules such as. in most works