Substituted malonamides as extractants for partitioning of actinides from nuclear waste solutions

Transport of Americium(III) through a supported liquid membrane containing N,N,N′,N′-tetraoctyl-3-oxapentane diamide (TODGA) in n-dodecane as the carrier

“…TRUEX, TRPO, DIDPA and DIAMEX utilizing the reagents such as octyl (phenyl) N,N-diisobutyl carbamoyl methyl phosphine oxide (CMPO), trialkyl phosphine oxide (TRPO), diisodecyl phosphoric acid (DIDPA) and N,N ,N,N -dimethyl dibutyl tetradecyl malonamide (DMDBTDMA), respectively, have shown great promise and have been tested in the pilot plant scale [1][2][3][4]. Amongst these extractants, diamides have been found to be particularly promising in view of their improved back extraction properties towards Am(III)/Cm(III), their complete incinerability and the innocuous nature of their radiolytic degradation products (mainly carboxylic acids and amines) that can be easily washed out [5,6]. However, their forward extraction efficiency for Am(III) at <4 M HNO 3 is significantly lower than that of CMPO.…”

Effect of the Structure of o-Methyleneoxyphenyldiphosphine Dioxides on Their Extractive Power and Selectivity in Nitric Acid Solutions

“…Distribution coefficients of (1, 4) Th(IV), (2, 3) Pu(IV), (5!7) U(VI), and(8,9) Am(III) as functions of the concentrations of (1, 2, 5, 7, 8) reagent I and(3,4,6,9) reagent II in dichloroethane in extraction from(1! 6, 8, 9) 3 and(7)0.5 M HNO 3 .…”

Recovery of Palladium from Concentrated Nitrate Solutions with N,N 2-Dimethyl-N,N 2-Dioctyltetradecy lmalonamide as New Extractant

“…Many researchers have tried to improve and develop novel extractants, which have high extraction efficiency as well as selectivity for platinum group metals (PGMs). During the last twenty years a several of amide bidentate ligands have been often proposed for the solvent extraction process, mainly due to their faster kinetics, higher efficiency, selectivity, and complete incinerability [18][19][20][21][22] .…”

“…Although malonamides have been extensively investigated for the extraction of lanthanide and actinide ions in nuclear processing industry [21][22][23] , only a limited amount of work reported involving the use of these ligands for the extraction of Pd(II) from hydrochloric acid solutions [3][4][5][6][7][8] . No systematic studies have been reported on the extraction of Pd(II) from concentrated nitrate media.…”