EQUATIONS ON STATE AND ACTIVITY-COEFFICIENT MODELS FOR VAPOR-LIQUID-EQUILIBRIA OF POLYMER-SOLUTIONS

KONTOGEORGIS, GM; FREDENSLUND, A; ECONOMOU, IG; TASSIOS, DT

dc.contributor.author	KONTOGEORGIS, GM	en
dc.contributor.author	FREDENSLUND, A	en
dc.contributor.author	ECONOMOU, IG	en
dc.contributor.author	TASSIOS, DT	en
dc.date.accessioned	2014-03-01T01:09:52Z
dc.date.available	2014-03-01T01:09:52Z
dc.date.issued	1994	en
dc.identifier.issn	0001-1541	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11222
dc.subject	Equation of State	en
dc.subject	Polymer Solution	en
dc.subject	Vapor Liquid Equilibria	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	HARD-CHAIN THEORY	en
dc.subject.other	THERMODYNAMIC PROPERTIES	en
dc.subject.other	SOLVENT ACTIVITIES	en
dc.subject.other	STATISTICAL THERMODYNAMICS	en
dc.subject.other	PHASE-EQUILIBRIA	en
dc.subject.other	MOLTEN POLYMERS	en
dc.subject.other	MIXTURES	en
dc.subject.other	PREDICTION	en
dc.subject.other	MOLECULES	en
dc.subject.other	FLUIDS	en
dc.title	EQUATIONS ON STATE AND ACTIVITY-COEFFICIENT MODELS FOR VAPOR-LIQUID-EQUILIBRIA OF POLYMER-SOLUTIONS	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/aic.690401012	en
heal.identifier.secondary	http://dx.doi.org/10.1002/aic.690401012	en
heal.language	English	en
heal.publicationDate	1994	en
heal.abstract	Four noncubic equations of state (EOS) and five activity coefficient models are applied to binary polymer and solvent solutions. Solvent activities at intermediate concentrations and equilibrium pressures are predicted with the perturbed-soft-chain theory (PSCT), group-perturbed-soft-chain theory, (GPSCT), group-contribution-lattice fluid (GCLF) EOS, GC-Flory EOS, UNIFA C-FV, entropic-FV and GK-FV models, ''new'' UNIFA C, and modified Flory-Huggins model. Free-volume activity coefficient models (UNIFAC-FV, entropic-FV) are simpler and, when applied to polymer solutions, more accurate than the EOS. Activity coefficient models are restricted to low-pressure calculations and require accurate values of pure-component volumes. Mixture parameters for activity coefficient models and GC-Flory EOS have been previously evaluated from experimental vapor-liquid equilibrium data for mixtures with only low-molecular-weight compounds. The GC-Flory EOS, though more complicated than activity coefficient models, provides equally good or in some cases better predictions. The application of GC-Flory EOS developed as an activity coefficient model is restricted to low-pressure calculations. On the other hand, PSCT and GCLF developed as ''true'' EOS provide reliable equilibrium predictions using mixture parameters evaluated solely from pure-component properties together with standard mixing and combining rules. PSCT EOS performs generally better than GCLF EOS for polymer solutions considered in this study.	en
heal.publisher	AMER INST CHEMICAL ENGINEERS	en
heal.journalName	AICHE JOURNAL	en
dc.identifier.doi	10.1002/aic.690401012	en
dc.identifier.isi	ISI:A1994PL53700011	en
dc.identifier.volume	40	en
dc.identifier.issue	10	en
dc.identifier.spage	1711	en
dc.identifier.epage	1727	en