Extraction of uranium(VI) and plutonium(IV) with some aliphatic amides

Advanced Hydrometallurgical Separation of Actinides and Rare Metals in Nuclear Fuel Cycle

“…The development of an N,N-dialkylamide as a new, more highly efficient extractant than TBP began in the 1960's in the USA [3,4] and, up to the present, work is also reported from Italy [5,6], France [7][8][9] , Russia [10,11], and India [12,13]. Also in the Japan Atomic Energy Agency (JAEA), development of new N,N-dialkyamides as alternative extractants to TBP began in 1992 [14,15].…”

Redox behavior of gas phase Pu(IV)-monodentate ligand complexes: an investigation by electrospray ionization mass spectrometry

“…Numerous approaches have been used to characterize these complexes, for example, distribution ratio measurements [4,7,8,[12][13][14][15][16], spectroscopic characterization [4,[16][17][18], and thermodynamic data measurements [7,8,13,15,19]. While classical solution chemistry methods are informative and helpful in providing insight into the coordination behavior of Pu(IV) with these ligands, there are only a few publications on the use of electrospray ionization mass spectrometry (ESI-MS) to obtain information on Pu(IV) complexes in solution.…”

Extraction of Uranium(VI) from Nitric Acid Solution Using Pyrrolidone Derivatives

“…It has been reported that N,N-disubstituted amides [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] and N-substituted cyclic amides [20][21][22] extract U(VI) effectively. The physicochemical properties of these compounds as the extractants can be tuned by the judicious choice of alkyl groups.…”

“…Molecular modeling methods have also been used to understand the influence of amide structures on the extraction behavior of metal ions. 1,2) Amide compounds for U and Pu cycles are classified into three types based on the extraction properties, i.e., the first one is compounds such as N,N-dihexyl octanamide, which can extract U(VI) and Pu(IV) simultaneously, [1][2][3][4][5][6][7][8]21,22) the second is compounds such as N,N-di-2-ethylhexylbutanamide, which can extract U(VI) and Pu(IV) species in the high-concentration region of HNO 3 and strip only Pu(IV) species in the low-concentration region of HNO 3 , 4,9) and the third one is compounds that can extract only U(VI) [9][10][11] such as N,N-di-2-ethylhexyl-iso-butanamide (D2EHIBA). D2EHIBA has also been studied as the extractant for recovering 233 U from irradiated Th.…”

“…8,[12][13][14][15][16][17][18]20) Hence, the extraction systems based on the use of amide compounds are expected to lead to innovation in the separation of actinoid species. Furthermore, it has been reported that the equilibrium in the extraction of U(VI) from HNO 3 solutions using amides can be expressed as 4,5,7,9,12,18,[20][21][22] …”