Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/26118
Type: Artigo de periódico
Title: Calculation of liquid-liquid equilibrium of aqueous two-phase systems using a chemical-theory-based excess Gibbs energy model
Author: Pessôa Filho, P. A.
Mohamed, R. S.
Abstract: Mixtures containing compounds that undergo hydrogen bonding show large deviations from ideal behavior. These deviations can be accounted for through chemical theory, according to which the formation of a hydrogen bond can be treated as a chemical reaction. This chemical equilibrium needs to be taken into account when applying stability criteria and carrying out phase equilibrium calculations. In this work, we illustrate the application of the stability criteria to establish the conditions under which a liquid-phase split may occur and the subsequent calculation of liquid-liquid equilibrium using a chemical-theory-modified Flory-Huggins equation to describe the non ideality of aqueous two-phase systems composed of poly(ethylene glycol) and dextran. The model was found to be able to correlate ternary liquid-liquid diagrams reasonably well by simple adjustment of the polymer-polymer binary interaction parameter.
Subject: Aqueous two-phase systems
thermodynamic modeling
Gibbs energy
liquid-liquid equilibrium
Editor: Brazilian Society of Chemical Engineering
Rights: aberto
Identifier DOI: 10.1590/S0104-66322004000300011
Address: http://dx.doi.org/10.1590/S0104-66322004000300011
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322004000300011
Date Issue: 1-Sep-2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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