Synthesis of some N,N,N′,N′‐Tetraalkyl‐3‐Oxa‐Pentane‐1,5‐Diamide and their Applications in Solvent Extraction

Abstract

A number of novel structurally related diglycolamides compounds were synthesized by a modified efficient method. These compounds were applied to the extraction of selected actinides, lanthanides, and alkaline earth metals from nitric acid solutions using benzene as diluent. The extraction of nitric acid was also studied. The dependence of the extraction distribution ratio, D M, on the length of alkyl chain of the extractants as well as the type of diluents was investigated. The extraction of selected lanthanides, actinides, and divalent metal ions by TODGA and THDGA from nitric acid medium was studied in details. D M of the investigated metal ions has been studied as a function of aqueous HNO 3 concentrations, diglycolamides concentration, and temperature.

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

“…These results are consistent with those reported previously by us and others for different diamides 1,5,20,28 .…”

“…The peaks at 1378 and 1370 cm -1 in the IR spectra of the extracted species suggest the presence of free nitrate ions, which may exist in the extracted molecules 20,28 . These results are consistent with those reported previously by us and others for different diamides 1,5,20,28 .…”

“…No systematic investigation has been reported on the extraction of Pd(II) with DMDOTDMA from concentrated nitrate media. In a previous work 1,2,23,28,29 , we reported on the synthesis and utilizations of different diamides, diglycolamides and cyanamides for the extraction and separation of selected PGMs and base metal ions from various acid solutions.…”

Solvent extraction of U(VI) by N,N-dimethyl-N′,N′-dioctylsuccinylamide and N,N-dimethyl-N′,N′-didecylsuccinylamide in cyclohexane

“…The two straight long-chain alkyls adjacent to nitrogen atom in succinylamide extractants lead to a big steric hindrance effect, which is possibly responsible for the difference of the formed extracted species. One alkyl group of DMDOSA or DMDDSA adjacent to nitrogen atom is a small group-methyl, and the other is a bigger one-octyl or decyl; the stereochemical hindrance around the carbonyl oxygen atoms is kept to a minimum, and both oxygen atoms can interact with uranyl ion [26]. On the other hand, the hydrophobic character of the ligands is attained in the presence of a longer alkyl-octyl or decyl.…”

Ionic Liquid and Supercritical Fluid Hyphenated Techniques for Dissolution and Separation of Lanthanides, Actinides, and Fission Products

“…According to the literature, 31 3 . The distribution ratios of uranyl and neodymium were also found to increase with increasing TBP ( (Table 2).…”