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

Kontogeorgis, GM; Yakoumis, IV; Coutsikos, P; Tassios, DP

dc.contributor.author	Kontogeorgis, GM	en
dc.contributor.author	Yakoumis, IV	en
dc.contributor.author	Coutsikos, P	en
dc.contributor.author	Tassios, DP	en
dc.date.accessioned	2014-03-01T01:12:33Z
dc.date.available	2014-03-01T01:12:33Z
dc.date.issued	1997	en
dc.identifier.issn	0378-3812	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12125
dc.subject	Critical properties	en
dc.subject	High molecular weight compounds	en
dc.subject	Model	en
dc.subject	Van der Waals surface area	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	Mathematical models	en
dc.subject.other	Molecular weight	en
dc.subject.other	Paraffins	en
dc.subject.other	Van der Waals forces	en
dc.subject.other	Critical pressure	en
dc.subject.other	Critical temperature	en
dc.subject.other	Hole theory	en
dc.subject.other	Phase equilibria	en
dc.title	A generalized expression for the ratio of the critical temperature to the critical pressure with the van der Waals surface area	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0378-3812(97)00174-X	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0378-3812(97)00174-X	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	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
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Fluid Phase Equilibria	en
dc.identifier.doi	10.1016/S0378-3812(97)00174-X	en
dc.identifier.isi	ISI:000071594900010	en
dc.identifier.volume	140	en
dc.identifier.issue	1-2	en
dc.identifier.spage	145	en
dc.identifier.epage	156	en