Synthesis and evaluation of new modified diglycolamides with different stereochemistry for extraction of tri- and tetravalent metal ions

Diglycolamide (DGA) extractant is a kind of rare-earth extractant with promising applications that has the advantages of high extraction capacity, ease of synthesis, good thermal stability and good radiation stability. It is a green extractant that contains only four elements, C, H, O and N, and produces no residue after incineration. The properties of DGAs containing branched N,N′-alkyl substituents have been much studied in recent years, and it has been shown that branched side chains lead to better separation. The introduction of structurally rigid elements in DGA provides new possibilities for separation of rare earth elements (REEs). Owing to the tiny differences in the chemical properties of adjacent REES, the simple use of DGA extractant cannot meet all separation requirements, and a masking agent is added to the aqueous phase to improve the separation by coextraction to meet the requirements of different processes. This review presents the structural analysis of the complexes and crystals of diglycolamide extractants with rare-earth ions through different characterization means, and the effects of different structural extractants, solvents, nitric acid and phase modifiers on extraction behavior are reviewed. This review pays special attention to the effect of the side chain structure of diglycolamide on extraction behavior, which provides a theoretical basis and guiding direction for the field of separation of the REEs by diglycolamide extractants.

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Bis(N-Alkyl-N-diphenylphosphinylmethyl)diglycolamides: Synthesis and NMR Spectroscopy Study

Artyushin,

Sharova,

Tcarkova

et al. 2024

Žurnal obŝej himii

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Bis(N-Alkyl-N-diphenylphosphinylmethyl)diglycolamides [Ph2P(O)CH2N(R)C(O)CH2]2O, where R = Et, i-Pr, n-Bu, i-Bu, n-Oct, were synthesized by reaction of diglycolyl chloride with N-alkyl-N-(diphenylphosphinylmethyl)amines Ph2P(O)CH2NHR obtained by the Kabachnik–Fields reaction of aminomethylation of diphenylphosphinous acid, and their hydrochlorides. The structure of the obtained compounds was studied by 1H, 13C and 31P NMR spectroscopy.

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Synthesis and evaluation of new modified diglycolamides with different stereochemistry for extraction of tri- and tetravalent metal ions

Abstract: Americium separation from high level nuclear waste can provide certain benefits such as reducing the long-term heat generation or the possibility of re-use as fuel in innovative reactors. The separation...

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References 42 publications

Effect of branching in the alkyl chain of diglycolamide on the sequestration of tetravalent actinides: solvent extraction and theoretical studies

Effect of branching in the alkyl chain of diglycolamide on the sequestration of tetravalent actinides: solvent extraction and theoretical studies

Application of diglycolamide extractant in rare-earth extraction

Bis(N-Alkyl-N-diphenylphosphinylmethyl)diglycolamides: Synthesis and NMR Spectroscopy Study

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