Application of the van der Waals equation of state to polymers. II. Prediction

Harismiadis, VI; Kontogeorgis, GM; Fredenslund, A; Tassios, DP

dc.contributor.author	Harismiadis, VI	en
dc.contributor.author	Kontogeorgis, GM	en
dc.contributor.author	Fredenslund, A	en
dc.contributor.author	Tassios, DP	en
dc.date.accessioned	2014-03-01T01:42:31Z
dc.date.available	2014-03-01T01:42:31Z
dc.date.issued	1994	en
dc.identifier.issn	03783812	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/23863
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0028426777&partnerID=40&md5=cb50fad9b27b29c68d08a72d619b5d56	en
dc.subject	Activity coefficient	en
dc.subject	Application	en
dc.subject	Athermal polymer solutions	en
dc.subject	Cubic	en
dc.subject	Equations of state	en
dc.subject	Mixing rules	en
dc.subject	Theory	en
dc.subject	Vapor-liquid equilibria	en
dc.subject.other	Equations of state	en
dc.subject.other	Mathematical models	en
dc.subject.other	Molecular weight	en
dc.subject.other	Solvents	en
dc.subject.other	Thermodynamics	en
dc.subject.other	Activity coefficient	en
dc.subject.other	Mixing rules	en
dc.subject.other	Vapor liquid equilibria	en
dc.subject.other	Polymers	en
dc.title	Application of the van der Waals equation of state to polymers. II. Prediction	en
heal.type	journalArticle	en
heal.publicationDate	1994	en
heal.abstract	Harismiadis, V.I., Kontogeorgis, G.M., Fredenslund, A. and Tassios, D.P, 1994. Application of the van der Waals equation of state to polymers. II. Prediction, Fluid Phase Equilibria, 96: 93-117. For polymers, the energy and co-volume parameters of cubic equations of state can be reliably estimated using only two low-pressure volumetric data points. This procedure is applied to the van der Waals equation of state, and bubble-point pressure calculations are performed for a number of polymer solutions. The van der Waals one-fluid mixing rules are used. The Berthelot combining rule is used for estimating the cross energy parameter, while the usual arithmetic mean combining rule is used for evaluating the cross co-volume parameter. Deviations from Berthelot's combining rule are taken into account via a simple method requiring only the molecular weight of the solvent. It is shown that when the proposed method is applied, the van der Waals equation of state can predict the equilibrium pressures of polymer solutions. The accuracy of the predictions is very good, comparable to those of other more complex equations of state, but it is in general inferior to those of the free-volume activity coefficient models. The simplicity, accuracy and general applicability of the proposed method makes it an attractive alternative to previously proposed complex models for prediction of equilibrium pressures of nearly athermal and non-polar polymer solutions. © 1994.	en
heal.journalName	Fluid Phase Equilibria	en
dc.identifier.volume	96	en
dc.identifier.issue	C	en
dc.identifier.spage	93	en
dc.identifier.epage	117	en