Contribution to the study of the oxidation reaction of Np(V) by nitric acid catalyzed par nitrous acid
Description
The oxidation reaction kinetics of Np(V) to Np(VI) by nitric acid catalyzed by nitrous acid was studied. In a first part, a detailed bibliographical survey was made of the oxidation-reduction reactions of U, Np, Pu, Am with nitrous and nitric acids (51 references). It is shown that only when both the organic and aqueous phases are mixed up, the extraction of a reaction product (NpVI) induces an equilibrium displacement. TBP was used as solvent. It is shown that the extraction of nitrous acid from the solvent enables the nitrous acid concentration to be kept constant and in the same order of magnitude than that of Np. This enables to show that Np(V) and nitrous acid have no simple orders. The temperature and nitric acid concentration dependence was studied. It is shown that tetravalent nitrogen must play a major part in the Np(V) oxidation
Availability note (English)
MF available from INIS under the Report Number.Abstract (French)
On a etudie la cinetique de la reaction d'oxydation de Np(V) en Np(VI). Dans une premiere partie, une etude bibliographique des reactions d'oxydo-reduction des elements U, Np, Pu, Am avec les acides nitriques et nitreux a ete effectuee (51 references). On montre que seulement dans le cas ou les phases aqueuses et organiques sont en contact permanent, l'extraction d'un produit de la reaction (NpVI) provoque un deplacement de l'equilibre de la reaction. On a utilise le TBP comme solvant. On montre que l'extraction de l'acide nitreux dans le solvant permet de maintenir constantes des concentrations d'acide nitreux du meme ordre de grandeur que celles de Np. Cela permet de verifier que la reaction n'a pas d'ordre simple par rapport a Np(V) et a l'acide nitreux. On a etudie l'influence de la temperature et de la concentration en acide nitreux. On montre le role preponderant joue par l'azote tetravalent dans l'oxydation de Np(V)Files
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Additional details
Additional titles
- Original title (French)
- Contribution a l'etude de la reaction d'oxydation du neptunium pentavalent par l'acide nitrique catalysee par l'acide nitreux
Publishing Information
- Imprint Pagination
- 92 p.
- Report number
- CEA-R--4665
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 7232825
- Subject category
- S38: RADIATION CHEMISTRY, RADIOCHEMISTRY AND NUCLEAR CHEMISTRY;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- CATALYSIS; CATIONS; CHEMICAL REACTION KINETICS; DISTRIBUTION FUNCTIONS; NEPTUNIUM COMPOUNDS; NITRIC ACID; NITROUS ACID; OXIDATION; SOLVENT EXTRACTION; TBP
- Descriptors DEC
- ACTINIDE COMPOUNDS; BUTYL PHOSPHATES; CHARGED PARTICLES; CHEMICAL REACTIONS; ESTERS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; IONS; KINETICS; ORGANIC COMPOUNDS; ORGANIC PHOSPHORUS COMPOUNDS; PHOSPHORIC ACID ESTERS; REACTION KINETICS; SEPARATION PROCESSES; TRANSURANIUM COMPOUNDS