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Theses

Contribution à l'étude de la mouillabilité dans une colonne pulsée dédiée à la fabrication d'un précipité,

Abstract : The process dedicated to the oxalic precipitation of plutonium is very sensitive to the high sticking behavior of the produced precipitates. Therefore, the laboratory of génie chimique et instrumentation based in Marcoule in France puts forward the idea of carrying out the process in a pulsed column. In this way, the precipitates is confined inside in the droplets of the emulsion, far from the surfaces of the apparatus. Nevertheless if those surfaces are made of stainless steal the fouling of the column is inevitably observed. The thesis also introduces the concept and tools dedicated to a fine understanding of the fouling issue. Though the work carried out scans the whole issue, the thesis mainly focuses on drop bouncing. the results provide experimental data in a low-studied configuration and target the key parameters driving th bounce. The application of the these results point out that using an unoptimized stainless steal pulsed column for the precipitation of radionucleides does not prevent from the fouling. The process could still be carried out using another technology patented during the PhD. This last poitn needs more investigations. Especially, the CEA has work on the scale-up steps to design an apparatus wich could be able to porcess industrial flow rates. Bsides ths might be an interessing issue in process engineering.
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Submitted on : Monday, June 25, 2012 - 9:27:55 AM
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Romain Picard. Contribution à l'étude de la mouillabilité dans une colonne pulsée dédiée à la fabrication d'un précipité,. Autre. Ecole Centrale Paris, 2011. Français. ⟨NNT : 2011ECAP0060⟩. ⟨tel-00711473⟩

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