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Genre/Form: | Thèses et écrits académiques |
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Material Type: | Document, Thesis/dissertation, Internet resource |
Document Type: | Internet Resource, Computer File |
All Authors / Contributors: |
Romain Berlemont; Jean-Pierre Simonin; Moncef Stambouli; Isabelle Mabille; Éric Climent, enseignant-chercheur en meÌcanique des fluides).; Pascal Baron, ingeÌnieur).; Manuel Miguirditchian; Université Pierre et Marie Curie (Paris / 1971-2017).; École doctorale Chimie physique et chimie analytique de Paris Centre (Paris / 2000-....).; Physicochimie des électrolytes et nanosystèmes interfaciaux (Paris / 2014-...). |
OCLC Number: | 945570470 |
Notes: | Titre provenant de l'écran-titre. |
Description: | 1 online resource |
Responsibility: | Romain Berlemont ; sous la direction de Jean-Pierre Simonin. |
Abstract:
This thesis was conducted in the framework of the reprocessing of spent nuclear fuels. The kinetics extraction of uranium(VI) and plutonium(IV) by N,N-dialkylamides or monoamides in an aliphatic diluent were studied from an aqueous nitric solution using 3 different techniques: “single drop technique”, Nitsch cell and Rotating Membrane Cell (RMC). All these experiments were useful to attempt the identification of the transfer process between the phases which can be controlled by kinetic or diffusional regime. The kinetics of extraction of U(VI) by monoamides solvent seems to be similar to that of the Pu(IV). In general, molecular diffusion in organic phase slows down the extraction process and the limiting thickness of organic phase increases with solvent viscosity. The process in “single drop technique” seems to be controlled not only by diffusion but also by the chemical reaction. Then the extraction kinetics of U(VI) has been carried out by Nitsch cell and the RMC. Diffusionnal regime is the limiting step in Nitsch cell and the results confirm that molecular diffusion in organic phase should mainly control the kinetics transfer. Then experiments performed by the RMC indicate that the kinetics is in the same order as transfer coefficient obtained by “single drop” and the chemical reaction occurs at the interface. Finally, these results were compared with data obtained with a TBP solvent (tributyl phosphate) currently used in the PUREX process in order to estimate the interest of such a new solvent. The kinetics of extraction of U(VI) by this monoamide-based solvent is three times lower that of the TBP 30 % but remains fast and suitable for a future industrial process.
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