A generalized expression for the ratio of the critical temperature to the critical pressure with the van der Waals surface area

 
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1997 (EN)
A generalized expression for the ratio of the critical temperature to the critical pressure with the van der Waals surface area (EN)

Yakoumis, IV (EN)
Tassios, DP (EN)
Coutsikos, P (EN)
Kontogeorgis, GM (EN)

N/A (EN)

Using an extensive database of experimental critical properties for heavy compounds, which have been compiled mostly from recent literature sources, it is shown that the ratio T-c:P-c (critical temperature over critical pressure) can be expressed in terms of the van der Waals surface area (Q(w)), which is readily available for any compound from the group contributions of Bondi (given also in UNIFAC tables). The proposed correlation is based on the hole theory of Kurata and Isida for n-paraffin liquids, which is mathematically equivalent to Flory's theory of polymer solutions. The method is suitable for medium to high molecular weight compounds with unknown critical constants. For example, if only one of the two critical constants is available, then the proposed generalized equation offers a useful rapid procedure for the estimation of the other critical property for use in corresponding states, and other relevant applications where knowledge of the critical properties is required. Furthermore, the T-c:P-c method can be used in many cases for identifying the most suitable among the existing group contribution methods for estimating the critical properties of heavy and complex compounds for which experimental values are, very often, not available. Published by Elsevier Science Ltd. (EN)

journalArticle

Paraffins (EN)
Critical pressure (EN)
Critical properties (EN)
Van der Waals surface area (EN)
Van der Waals forces (EN)
Hole theory (EN)
Model (EN)
Phase equilibria (EN)
Mathematical models (EN)
Critical temperature (EN)
High molecular weight compounds (EN)
Molecular weight (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Fluid Phase Equilibria (EN)

1997


ELSEVIER SCIENCE BV (EN)



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