Cogema Compagnie Generale Des Matieres Nucleaires

Cogema Compagnie Generale Des Matieres Nuclearies

Cogema-Compaignie Generale Des Matieres Nucleaires

Cogema-Compagnie Generale Des Matieres Nuclearires

Vincent Guyon

Marc Lemaire

Jacques Foos

Alain Guy

Rodolphe Chomel

Pierre Doutreluigne

Henri Le Roy

Thierry Moutarde

Rodolph Chomel

Micheline Draye

Gerard Le Buzit

Andre Deloge

Andre Delo Ge

The invention concerns the recovery of Pu (IV) by using crown compounds. According to the invention, the aqueous solution containing the plutonium (IV) is placed in contact with at least one crown compound, for example DCH 18C6, dissolved in an organic diluting agent, such as benzonitrile. In the case where the solution only contains traces of Pu, it is possible to use a crown compound secured to a solid phase, such as silica. The aqueous solution is a concentrated solution of fission products, an effluent originating from an irradiated nuclear fuel reprocessing installation or a concentrated solution of plutonium with americium.

Method for recovering with the aid of a crown compound plutonium (IV)

The invention relates to the use of thioether ligands in accordance with the formula: ##STR1## in which R.sup.1 and R.sup.2, which can be the same or different, represent alkyl radicals, R.sup.3 is an alkyl radical and A represents a divalent radical chosen from among the radicals of formula:

Use of thioether ligands for separating palladium from aqueous solutions

A method for separating plutonium from uranium and from fission products with the aid of crown ether compounds comprising contacting an aqueous solution A0 containing Pu, U and fission products with an organic solvent O0 containing at least one crown ether compound to obtain an organic solution O1 containing Pu and U; extracting U from the organic solution O1 with an aqueous solution A4 such as water or nitric acid to obtain an aqueous solution A5 containing U and an organic solution O3 containing mainly of Pu and recovering Pu from the organic solution using an aqueous solution A6 such as sulfuric acid.

Method for separating by using crown compounds plutonium from uranium

A method for separating the isomers of a crown ether compound and making it possible to recover in particular the pure cis-syn-cis isomer from DCH 18C6 includes:

Method of separating isomers of a crown ether compound to recover

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Paris, France

Vincent Guyon