Representation of liquid-liquid equilibria for polymer-salt aqueous two-phase systems

resumo

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.

palavras-chave

EXCESS GIBBS ENERGY; LOCAL COMPOSITION MODEL; POLYETHYLENE-GLYCOL; AMMONIUM-SULFATE; ETHYLENE-OXIDE; THERMODYNAMIC PROPERTIES; POLY(ETHYLENE GLYCOL); ELECTROLYTE SYSTEMS; RANDOM COPOLYMER; PHASE-DIAGRAMS

categoria

Engineering

autores

Xu, X; Madeira, PP; Macedo, EA

nossos autores

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