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Toward high salinity solutions

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BRGM is also interested and involved in the developpment of databases for high ionic strength solutions, relying on the Pitzer model. Applications concern natural hypersaline environments (saline lakes, deep reservoir aquifers, geothermal and hydrothermal fluids, etc.) and industrial process fluids. You can have an insight to our activities there.

Thermoddem is developped paying attention to the consistency with the Pitzer thermodynamic database developped at BRGM. This concerns the thermodynamic properties of highly and sparingly soluble salts as illustrated in the figure below.

Solubility of Mirabilite and Thenardite as a function of temperature : Comparison between experimental (symbols) data and calculations based on solubility refinement (black lines) and on equilibrium constant obtained after a selection of thermodynamic properties (red lines). For further details, see Blanc et al. (2012).

These activities regarding the Pitzer database take place within a larger framework including the development of thermodynamic tools devoted to various application fields: saline systems, capillary conditions, fresh waters, from ambient to elevated P and T.


Bibliographic references

Lach A., Boulahya F., André L., Lassin A., Azaroual M., Serin J. P. & Cézac P. 2016. Thermal and volumetric properties of complex aqueous electrolyte solutions using the Pitzer formalism–The PhreeSCALE code. Computers & Geosciences, 92, 58-69.

Lassin A., Christov C., André L. & Azaroual M. 2015. A thermodynamic model of aqueous electrolyte solution behavior and solid-liquid equilibrium in the Li-H-Na-K-Cl-OH-H2O system to very high concentrations (40 molal) and from 0 to 250° C. American Journal of Science, 315(3), 204-256.

Lach A., André L., Lassin A., Azaroual M., Serin J. P. & Cézac P. 2015. A New Pitzer Parameterization for the Binary NaOH–H2O and Ternary NaOH–NaCl–H2O and NaOH–LiOH–H2O Systems up to NaOH Solid Salt Saturation, from 273.15 to 523.15 K and at Saturated Vapor Pressure. Journal of Solution Chemistry, 44(7), 1424-1451.

André L., Christov C., Lassin A. & Azaroual M. 2013. Thermodynamic Behavior of FeCl3-H2O and HCl-FeCl3-H2O Systems–A Pitzer Model at 25° C. Procedia Earth and Planetary Science, 7, 14-18.

Azaroual M., Kervevan C., Lassin A., André L., Amalhay M., Khamar L. & El Guendouzi M. 2012. Thermo-kinetic and physico-chemical modeling of processes generating scaling problems in phosphoric acid and fertilizers production industries. Procedia Engineering, 46, 68-75.

Leroy P., Lassin A., Azaroual M. & André L. 2010. Predicting the surface tension of aqueous 1: 1 electrolyte solutions at high salinity. Geochimica et Cosmochimica Acta, 74(19), 5427-5442.

André L., Lassin A. & Azaroual M. 2009. A methodology to estimate Pitzer interaction parameters. Geochimica et Cosmochimica Acta Supplement, 73, 41.

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