Commissariat a L'energie Atomique Et Aux Energies Alternatives

Electricite De France

Orano Cycle

Orano Recyclage

Gaëlle Milanole

Manuel Miguirditchian

Cécile Marie

Pascal Baron

Christian Sorel

Emilie Russello

Sandra Lopes Moreira

A dissymmetric RN,N-dialkylamides of formula (I) in which: Rrepresents a linear Cto Calkyl, Rrepresents a linear Cto Calkyl, and Rrepresents a linear or branched Cto Calkyl, where Ris different from a n-octyl, n-decyl, n-dodecyl, 2-ethylhexyl and 2-ethyloctyl group when Rrepresents a n-butyl group and Rrepresents an ethyl group. A method for synthesising the N,N-dialkylamides, and uses of same for extracting uranium and/or plutonium from an aqueous acid solution or for fully or partially separating the uranium from the plutonium contained in an aqueous acid solution and a solution resulting from the dissolution of spent nuclear fuel in nitric acid. A method for treating an aqueous solution resulting from the dissolution of spent nuclear fuel in nitric acid, which allows the uranium and the plutonium contained in the solution to be extracted, separated and decontaminated in a single cycle.

Dissymmetric N,N-dialkylamides used particularly for separating uranium(VI) from plutonium(IV), synthesis thereof and uses of same

Novel dissymmetric N,N-dialkylamides which meet the following formula (I): where R represents a linear or branched alkyl group at Cto C. A method for synthesizing these N,N-dialkylamides, and to the uses of same as extractants, alone or in admixture, in order to extract uranium and/or plutonium from an aqueous acid solution, or to totally or separate uranium from plutonium from an aqueous acid solution and, in particular, an aqueous solution resulting from dissolving spent nuclear fuel in nitric acid. Further, a method for processing an aqueous solution resulting from the dissolution of a spent nuclear fuel in nitric acid, allowing the uranium and plutonium contained in the solution to be extracted, separated and decontaminated in a single cycle, without requiring any plutonium reduction operation, and in which one of the aforementioned N,N-dialkylamides or a mixture of same is used as extractant. Applications for the method include the processing of spent nuclear fuels, in particular comprising uranium (e.g. UOX) or uranium and plutonium (e.g. MOX).

Dissymmetric N,N-dialkylamides, the synthesis thereof and uses of same

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Orange, France

Gaëlle Milanole