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Communication dans un congrès

Pitzer parametrization constrained by density: application to natural and industrial systems

Abstract : Highly saline aqueous solutions are widely present in geological and industrial environments, particularly where water evaporation is strong. Among the various approaches that have been proposed in order to accurately describe the very complex chemistry of such systems, the Pitzer formalism can be successfully applied to determine aqueous solutions characteristics for high ionic strengths. Determining a consistent set of Pitzer parameters is a difficult task, and available databases currently apply to rather limited chemical systems: developments have to be performed to extend their fields of application [1]. Estimation of Pitzer parameters requires to measure specific characteristics of aqueous solutions such as: activity of water (aw), pH (for acid/base systems), osmotic coefficient (for completely dissociated electrolytes), aqueous speciation as an interpretation of Raman spectroscopy, mineral solubility, etc. However, depending on the system salinity, measurement of some of the above parameters can be problematic. Therefore, the use of an additional characteristic for constraining the Pitzer parameter estimation procedure may be of interest. We propose here to use as a constraint the density of the aqueous solution, the measurement of which is rapid and easy. Each aqueous species of a solution contributes to the density according to its concentration and its partial molar volume. Density calculations can be performed in the framework of the Pitzer formalism [2]. Results obtained for specific volume calculations of complex electrolytic systems, up to a temperature of 100°C and for high salinities, demonstrate the relevance of newly established Pitzer parametrization.
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Contributeur : Arnault Lassin Connectez-vous pour contacter le contributeur
Soumis le : vendredi 18 mars 2011 - 11:17:38
Dernière modification le : mardi 2 août 2022 - 16:17:27


  • HAL Id : hal-00578054, version 1



Arnault Lassin, Christophe Kervévan, Laurent André, Mohamed Azaroual. Pitzer parametrization constrained by density: application to natural and industrial systems. Goldschmidt Conference 2009 - Challenges to Our Volatile Planet, Jun 2009, Davos, Switzerland. ⟨hal-00578054⟩



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