Description of the Thermodynamic Properties of Aqueous Ionic Solutions within the Mean Spherical Approximation

The thermodynamic properties of ionic solutions are described within the mean spherical approximation (MSA). The original MSA and binding MSA (BiMSA) have been supplemented so as to include solvation effects. The model is shown to be capable of representing ionic solution thermodynamics in a wide ra...

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Bibliographic Details
Published in:Oil & gas science and technology 2008-05, Vol.63 (3), p.321-327
Main Authors: Simonin, J. P., Bernard, O., Blum, L.
Format: Article
Language:English
Subjects:
Applied sciences
Crude oil, natural gas and petroleum products
Energy
Exact sciences and technology
Fuels
Physics
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Summary:The thermodynamic properties of ionic solutions are described within the mean spherical approximation (MSA). The original MSA and binding MSA (BiMSA) have been supplemented so as to include solvation effects. The model is shown to be capable of representing ionic solution thermodynamics in a wide range of concentration, generally up to saturation, in the case of strong and associating electrolytes. It constitutes an interesting alternative to the Pitzer model. Les propriétés thermodynamiques de solutions aqueuses ioniques sont décrites dans l'approximation sphérique moyenne (MSA). Le modèle MSA original et celui avec association (BiMSA) ont été complétés de façon à inclure les effets de la solvatation. On montre que le modèle est capable de représenter la thermodynamique des solutions ioniques dans un large domaine de concentration, généralement jusqu'à la saturation, dans le cas des électrolytes forts et associés. Ce modèle constitue une alternative intéressante au modèle de Pitzer.
ISSN:1294-4475
1953-8189
DOI:10.2516/ogst:2008012