The amides a substituent heterocyclic nitrogen, their process of preparation and their use for extracting selectively the actinides (iii) and the to separate in particular of the lanthanides (iii).

摘要

PCT No. PCT/FR92/01124 Sec. 371 Date Jul. 27, 1993 Sec. 102(e) Date Jul. 27, 1993 PCT Filed Dec. 2, 1992 PCT Pub. No. WO93/11113 PCT Pub. Date Jun. 5, 1993.The invention relates to a process for the selective extraction of (III) actinides by means of amides having a nitrogenous heterocyclic substituent of formula: IMAGE (I) or IMAGE (II) in which R1 is an alkyl or alkoxy group or a hydrogen atom, R2 and R3, which can be the same or different, represent a hydrogen atom, an alkyl or an alkoxy group and R4 is a hydrogen atom or a group of formula: IMAGE in which R5 and R6, which can be the same or different, represent a hydrogen atom or an alkyl or alkoxy group. This process makes it possible to separate (III) actinides from (III) lanthanides.