EXTRACTION BY N,N,N',N'-TETRAALKYL -2 ALKYL PROPANE -1,3 DIAMIDES. H. U(VI) and Pu(IV)

Study of solid extractants based on malonamides, diglycolamides, and bipyridines for the partitioning of minor actinides from high active wastes

“…At lower nitric acid concentration the D g values pass minimum at ~ 0.5M HNO 3 and surprisingly increase again with decreasing nitric acid concentration. This behaviour is in contradiction with the published data for liquid-liquid extraction [4][5][6]. No explanation is currently available for this behaviour.…”

Influence of the extracted solute on the aggregation of malonamide extractant in organic phases: Consequences for phase stability

“…At the molecular scale, this difference may be explained by the weak bonds between HNO 3 and one carbonyl function of DMDBTDMA, and the strong bonds between the extractant and the metal nitrates [23,[36][37][38][39][40]. Another explanation of the difference in third phase formation may well be the difference of cation polarizability.…”

“…The other solutes, such as neodymium nitrate, have little effect on cmc. The formation of neutral complexes between lanthanide nitrate or uranyl nitrate and malonamide in neutral media leads to a slight modification of the surface active properties of the DMDBTDMA, and thus of the cmc [36][37][38][39][40].…”

Extraction Studies of Uranium(VI), Plutonium(IV) and Americium(III) from Nitric Acid Using the Bi-functional Carbamoyl Methyl Sulfoxide Ligands

“…This observation is similar to one that was observed for bi-functional extractants, such as carbamoyl methyl phosphonates, carbamoyl methyl phosphine oxides or malonamides with these metal ions. [3][4][5][6][7]21 However, the observed D values are always lower than those of carbamoyl methyl phosphonates or carbamoyl methyl phosphine oxides. This may be due the greater basicity or donating ability of phosphine oxides or phosphates to those of sulfoxides.…”

“…1,2 Various new extractants have been developed in the last two decades for the above mentioned purposes, and their extraction [3][4][5][6][7][8] and coordination 9-13 chemistry have been well studied. Neutral bi-functional extractants, such as, carbamoyl methyl phosphonates (CMP), carbamoyl methyl phosphine oxides (CMPO) [1][2][3][4] and malonaides (MA) [5][6][7] show very good extraction properties towards the minor actinides from high-level waste solutions.…”