Published May 1990 | Version v1
Report Open

Stability of trivalent plutonium nitrate in tributyl phosphate

Creators

Description

Plutonium (III) oxidation by nitric acid, or its reduced products, in tributyl phosphate during the plutonium reducing reextraction step of spent fuel reprocessing by the Purex process. A bibliographic review of plutonium chemistry in aqueous and organic solutions (Pu III and Pu IV absorption spectra in nitric and perchloric media) and of Pu III oxidation by nitrous compounds in aqueous and organic media is presented. The experimental part is a kinetic study in T BP of the following reactions: (i) Plutonium III oxidation by nitrous acid (in perchloric medium to avoid interference of nitrate ions); (ii) plutonium III oxidation by nitric acid with paranitro-aniline as anti-nitrous agent; (iii) plutonium III oxidation by nitric acid without anti-nitrous agent: this is the global reaction of plutonium reoxidation in the reprocessing. Auto-catalysis by nitrous acid is evidenced in this study

Availability note (English)

MF available from INIS under the Report Number.

Abstract (French)

On etudie en milieu phosphate de tributyle (TBP) les reactions d'oxydation du plutonium (III) par l'acide nitrique et ses especes reduites lors de l'etape de reextraction reductrice du plutonium du retraitement des combustibles nucleaires irradies (procede PUREX). La partie bibliographique est une etude de la chimie du plutonium en solutions aqueuse et organique (especes et spectres d'absorption du Pu(III) et du Pu(IV) en milieu nitrique et perchlorique) et de l'oxydation du plutonium (III) par les composes nitres en milieux aqueux et organiques (TBP). La partie experimentale, est une etude cinetique en milieu TBP des reactions suivantes: . Oxydation du plutonium (III) par l'acide nitreux (en milieu perchlorique afin d'eviter l'influence des ions nitrates); . Oxydation du plutonium (III) par l'acide nitrique en presence d'un agent anti-nitreux, la p.nitroaniline; . Oxydation du plutonium (III) par l'acide nitrique sans agent anti-nitreux; cette reaction est consideree comme la reaction globale de reoxydation du plutonium (III) ayant lieu dans le procede du retraitement. Lors de cette etude, nous avons mis en evidence une autocatalyse avec periode d'induction; le catalyseur est l'acide nitreux

Files

22049836.pdf

Files (2.4 MB)

Name Size Download all
md5:9a47d8f140ecbe9799be0e4a763712b3
2.4 MB Preview Download

Additional details

Additional titles

Original title (French)
Stabilite du nitrate de plutonium trivalent dans le phosphate de tributyle

Publishing Information

Imprint Pagination
182 p.
Report number
FRCEA-TH--339

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
22049836
Subject category
S11: NUCLEAR FUEL CYCLE AND FUEL MATERIALS;
Resource subtype / Literary indicator
Thesis
Descriptors DEI
ABSORPTION SPECTRA; AQUEOUS SOLUTIONS; CHEMICAL REACTION KINETICS; MEDIUM TEMPERATURE; NITRIC ACID; NITROUS ACID; OXIDATION; PLUTONIUM NITRATES; PUREX PROCESS; QUANTITY RATIO; TBP; TEMPERATURE DEPENDENCE
Descriptors DEC
ACTINIDE COMPOUNDS; BUTYL PHOSPHATES; CHEMICAL REACTIONS; DISPERSIONS; ESTERS; HOMOGENEOUS MIXTURES; HYDROGEN COMPOUNDS; INORGANIC ACIDS; INORGANIC COMPOUNDS; KINETICS; MIXTURES; NITRATES; NITROGEN COMPOUNDS; ORGANIC COMPOUNDS; ORGANIC PHOSPHORUS COMPOUNDS; OXYGEN COMPOUNDS; PHOSPHORIC ACID ESTERS; PLUTONIUM COMPOUNDS; REACTION KINETICS; REPROCESSING; SEPARATION PROCESSES; SOLUTIONS; SPECTRA; TRANSURANIUM COMPOUNDS