Representation of liquid-liquid equilibria for polymer-salt aqueous two-phase systems
authors Xu, X; Madeira, PP; Macedo, EA
nationality International
journal CHEMICAL ENGINEERING SCIENCE
author keywords phase equilibria; modeling; thermodynamics; polymer; excess Gibbs energy; aqueous two phase systems; modified Wilson equation
keywords EXCESS GIBBS ENERGY; LOCAL COMPOSITION MODEL; POLYETHYLENE-GLYCOL; AMMONIUM-SULFATE; ETHYLENE-OXIDE; THERMODYNAMIC PROPERTIES; POLY(ETHYLENE GLYCOL); ELECTROLYTE SYSTEMS; RANDOM COPOLYMER; PHASE-DIAGRAMS
abstract In this work the modified Wilson equation, proposed in a previous publication, for aqueous binary polymer solutions is extended to calculate liquid-liquid equilibrium of aqueous two-phase systems containing one salt with either polyethylene glycol or ethylene oxide-propylene oxide random copolymer. The Debye-Huckel equation based on the Fowler-Guggenheim theory is used to represent the long-range electrostatic interactions of ions. The parameters are estimated from only one or two tie-lines and are used to predict the phase diagrams with different molecular weights and polymer-salt systems at different temperatures. The predictions obtained with the modified Wilson equation are in good agreement with the experimental data. (C) 2004 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0009-2509
year published 2004
volume 59
issue 5
beginning page 1153
ending page 1159
digital object identifier (doi) 10.1016/j.ces.2004.01.004
web of science category Engineering, Chemical
subject category Engineering
unique article identifier WOS:000220342900017
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journal analysis (jcr 2019):
journal impact factor 3.871
5 year journal impact factor 3.78
category normalized journal impact factor percentile 75.874
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