A new modified Wilson equation for the calculation of vapor-liquid equilibrium of aqueous polymer solutions

• Type: Article in International Scientific Journal
• Date: 2003

Authors

Xu, X (Author) Other; Pedro P. Madeira (Author) FEUP; Teixeira, JA (Author) Other; Maria Eugénia Macedo (Author) FEUP

Journal

Title: Fluid Phase Equilibria

Vol. 213 No. 1-2

Pages: 53-63

ISSN: 0378-3812

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 30 Citations

ISI Web of Science

Scopus - 33 Citations

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Other information

Authenticus ID: P-000-ET3

DOI: 10.1016/s0378-3812(03)00185-7

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11