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Experimentation versus simulation du transport réactif en milieu poreux, capture de profils de concentration et évolution texturale des solides.

Abstract : A new type of plug flow reactor is developed to provide an experimental validation of reactive transport simulations. It reproduces a long (6 m) 1D porous medium composed of unreactive quartz and reactive solids exposed to the percolation of an aqueous phase, where sampling ports allow the concentration profiles in the fluid phase to be captured. The reaction of CO2 saturated solutions (5-8 bar) at 40-50 °C with carbonate (calcite, dolomite) gives rise to reproducible dissolution fronts migrating downflow. Some discrepancies between reactive transport simulations and experiments concern the sharpness of the reaction front and the outlet concentrations. A proper projection of experimental data for dolomite evidences the stationary shape of the moving dissolution front. This shape allows the variations in reactive surface area to be documented as a function of solid consumption, and the increasing reactive surface under far from equilibrium conditions is related to the observed skeletal textures. Diopside dissolution in HNO3 solutions (pH = 2) at 60 °C, allow verifying the predicted linearity of concentration profiles under stationary, far from equilibrium conditions. In the non-stoichiometric, transient stages of dissolution, mass balance calculations point to the formation of a Si-dominated surface layer. Direct SEM observations of reacted grains suggest this layer to be anisotropically distributed on the diopside surface.
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https://tel.archives-ouvertes.fr/tel-00466764
Contributor : Andrée-Aimée Toucas <>
Submitted on : Wednesday, March 24, 2010 - 5:10:25 PM
Last modification on : Monday, October 19, 2020 - 11:08:12 AM
Long-term archiving on: : Monday, June 28, 2010 - 4:38:44 PM

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  • HAL Id : tel-00466764, version 1

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Guillaume Battaia. Experimentation versus simulation du transport réactif en milieu poreux, capture de profils de concentration et évolution texturale des solides.. Sciences de la Terre. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2009. Français. ⟨tel-00466764⟩

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