A new modified Wilson equation for the calculation of vapor-liquid equilibrium of aqueous polymer solutions
authors Xu, X; Madeira, PP; Teixeira, JA; Macedo, EA
nationality International
journal FLUID PHASE EQUILIBRIA
author keywords model; activity; local composition; Wilson; polymer solutions; vapor-liquid equilibrium; excess Gibbs energy; aqueous two-phase systems
keywords POLY(ETHYLENE GLYCOLS); 2-PHASE SYSTEMS; THERMODYNAMIC PROPERTIES; ETHYLENE-OXIDE; WATER; PREDICTION; MIXTURES; MODEL
abstract A local composition model based on the lattice theory and two-fluid theory, considering the excess heat capacity, which is a modified Wilson equation, is developed for the excess Gibbs energy of aqueous polymer solutions. The model represents a synergistic combination of the excess entropy for mixing molecules of different sizes and the temperature dependent residual contribution, which combines the attractive interactions between solvent molecules and the segments with the contribution of the excess heat capacity. The results of the extrapolation with respect to molecular weight of phase equilibrium in aqueous polymer solutions with this model are very satisfactory, with only two adjustable parameters. (C) 2003 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0378-3812
year published 2003
volume 213
issue 1-2
beginning page 53
ending page 63
digital object identifier (doi) 10.1016/S0378-3812(03)00185-7
web of science category Thermodynamics; Chemistry, Physical; Engineering, Chemical
subject category Thermodynamics; Chemistry; Engineering
unique article identifier WOS:000186358100004
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journal impact factor 2.838
5 year journal impact factor 2.454
category normalized journal impact factor percentile 61.717
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