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1. (WO2018138441) DISSYMMETRIC N,N-DIALKYLAMIDES USED PARTICULARLY FOR SEPARATING URANIUM(VI) FROM PLUTONIUM(IV), SYNTHESIS THEREOF AND USES OF SAME

Pub. No.:    WO/2018/138441    International Application No.:    PCT/FR2018/050172
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Fri Jan 26 00:59:59 CET 2018
IPC: C07C 233/05
C22B 60/02
C22B 60/04
Applicants: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
Orano Cycle
ELECTRICITE DE FRANCE
Inventors: MILANOLE, Gaëlle
RUSSELLO, Emilie
MARIE, Cécile
MIGUIRDITCHIAN, Manuel
SOREL, Christian
Title: DISSYMMETRIC N,N-DIALKYLAMIDES USED PARTICULARLY FOR SEPARATING URANIUM(VI) FROM PLUTONIUM(IV), SYNTHESIS THEREOF AND USES OF SAME
Abstract:
The invention relates to novel dissymmetric RN,N-dialkylamides of formula (I) in which: R1 represents a linear C1 to C4 alkyl, R2 represents a linear C1 to C10 alkyl, and R3 represents a linear or branched C6 to C15 alkyl, provided that R3 is different from a n-octyl, n-decyl, n-dodecyl, 2-ethylhexyl and 2-ethyloctyl group when R1 represents a n-butyl group and R2 represents an ethyl group. The invention also relates to a method for synthesising said N,N-dialkylamides, and to the 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, in particular, to a solution resulting from the dissolution of spent nuclear fuel in nitric acid. The invention further relates to a method for the treatment of an aqueous solution resulting from the dissolution of spent nuclear fuel in nitric acid, which allows the uranium and the plutonium contained in said solution to be extracted, separated and decontaminated in a single cycle, without having to perform a plutonium reduction operation, and in which one of said N,N-dialkylamides or a mixture of same is used as an extractant. The invention is applicable in the treatment of spent nuclear fuel.