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Improvement of the Van Der Waals equation of state

✍ Scribed by G. Soave

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
916 KB
Volume
39
Category
Article
ISSN
0009-2509

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✦ Synopsis

The Van Der Waals equation of state has been modified in order to improve its accuracy. The introduction of a temperature dependence of the attraction term allows reproducing accurately purecompound vapour pressures. The modification of the mixing rules, with the infinite-pressure excess-freeenergy term expressed by a NRTL-like model, allows reproducing accurately phase equilibria,of polar and apolar systems. Finally, the introduction of a volume correction improves markedly the calculated liquid densities, without changing the phase-equilibrium conditions. The improved equation is accurate enough to be applied for design purposes.

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✍ G. Schmidt; H. Wenzel πŸ“‚ Article πŸ“… 1980 πŸ› Elsevier Science 🌐 English βš– 804 KB

A cubic equation of the van der Waals type 1s presented wtth the cntlcal compress~lxhty factor taken as substance dependent Input requrrements are Pltzer's acentnc factor and the crItIca temperature and pressure Parameter b IS treated as Independent of temperature, and the temperature dependence of