APPLICATION OF THE VAN-DER-WAALS-EQUATION OF STATE TO POLYMERS .2. 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	2014-03-01T01:42:45Z
dc.date.available	2014-03-01T01:42:45Z
dc.date.issued	1994	en
dc.identifier.issn	0378-3812	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/23928
dc.subject	THEORY	en
dc.subject	APPLICATION	en
dc.subject	EQUATIONS OF STATE	en
dc.subject	CUBIC	en
dc.subject	ACTIVITY COEFFICIENT	en
dc.subject	VAPOR-LIQUID EQUILIBRIA	en
dc.subject	MIXING RULES	en
dc.subject	ATHERMAL POLYMER SOLUTIONS	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	VAPOR-LIQUID-EQUILIBRIA	en
dc.subject.other	SOLVENT ACTIVITIES	en
dc.subject.other	MOLTEN POLYMERS	en
dc.subject.other	MIXTURES	en
dc.subject.other	SOLUBILITIES	en
dc.subject.other	THERMODYNAMICS	en
dc.subject.other	EOS	en
dc.title	APPLICATION OF THE VAN-DER-WAALS-EQUATION OF STATE TO POLYMERS .2. PREDICTION	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1994	en
heal.abstract	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.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	FLUID PHASE EQUILIBRIA	en
dc.identifier.isi	ISI:A1994NP76100006	en
dc.identifier.volume	96	en
dc.identifier.spage	93	en
dc.identifier.epage	117	en