The solvent extraction of rare earth elements from nitrate media with novel polyamides containing malonamide groups

Tyumentsev, Mikhail S.; Foreman, Mark; Ekberg, Christian; Matyskin, Artem V.; Retegan, Teodora; Steenari, Britt‐Marie

doi:10.1016/j.hydromet.2016.05.007

Cited by 29 publications

(20 citation statements)

References 23 publications

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“…The bismalonamide 2,2′‐[1,2‐phenylenebis(methylene)]bis( N , N , N′ , N′ ‐tetrabutylmalonamide) ( 1a ) was found to be particularly efficient at extracting trivalent lanthanide ions from nitric acid solutions . It was suggested that this ligand could coordinate to a metal ion with four carbonyl oxygen atoms, as its ortho ‐xylylene platform holds two malonamide groups close together . This coordination mode promotes favorable entropy changes of the reaction and therefore might explain the increased distribution ratios of the lanthanide(III) ions with bismalonamide 1a in the process of liquid–liquid extraction.…”

Section: Resultsmentioning

confidence: 99%

“…These results indicate that the dimers of the bismalonamide 1a and lanthanide(III) ions were not being formed under the selected experimental conditions. Also, when the diluent of an organic phase was nitrobenzene, no evidence for the dimer formation was observed by liquid–liquid extraction …”

Section: Resultsmentioning

confidence: 99%

“…The work described in this paper aims to help to fill in this knowledge gap. Recently, we reported a new bismalonamide ligand – 2,2′‐[1,2‐phenylenebis(methylene)]bis( N , N , N′ , N′ ‐tetrabutylmalonamide) – bearing two C ‐alkylated malonamide units onto an ortho ‐xylylene platform, which demonstrated higher distribution ratios of Ln III than the reference bidentate malonamide . We extend this research with a focus on the coordination studies of the bismalonamide ligands with trivalent lanthanides.…”

Section: Introductionmentioning

confidence: 83%

“…116–118 °C at 1 mbar) before use. The bismalonamide 2,2′‐[1,2‐phenylenebis(methylene)]bis( N , N , N′ , N′ ‐tetrabutylmalonamide) ( 1a ) was prepared as reported earlier . Aromatic kerosene Solvesso 150 ND (C 10 , aromatics, < 1 % naphthalene), used as a diluent in liquid–liquid‐extraction experiments, was purchased from IsoChem.…”

Section: Methodsmentioning

confidence: 99%

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Coordination of Trivalent Lanthanides with Bismalonamide Ligands: Implications for Liquid–Liquid Extraction

et al. 2017

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The complexation of the bismalonamide ligand 2,2′-[1,2-phenylenebis(methylene)]bis(N,N,N′,N′-tetraethylmalonamide) (L), bearing two C-alkylated N,N,N′,N′-tetraethylmalonamide groups, onto an ortho-xylylene [C 6 H 4 (CH 2 ) 2 ] platform with trivalent lanthanides was investigated, both in solid and solution states. The crystal structures [Nd 2 (NO 3 ) 6 L 2 ]·(CH 3 CN) 3 (2), [Nd 2 (NO 3 ) 4 L 2 ]·[Nd(NO 3 ) 5 ]·(CH 3 CN) 1.5 (3), Ce(NO 3 ) 3 L 2 (4), and [NdL 2 ]·(ClO 4 ) 3 ·C 2 H 5 OH (5) were analyzed by single-crystal X-ray [a]

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%

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Coordination of Trivalent Lanthanides with Bismalonamide Ligands: Implications for Liquid–Liquid Extraction

et al. 2017

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“…153 The use of RTILs as solvents for the extraction with malonamides changed their extraction behaviour in a way similar to that of DGAs (vide infra). constitute an important class of ligands for actinide partitioning first introduced in the early 1990s as a substitute for malonamides.…”

Section: Malonamidesmentioning

confidence: 99%

Alkylation and pre-organisation of diglycolamide ligands on flexible platforms for nuclear waste treatment

Leoncini

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Mechanism for Solvent Extraction of Lanthanides from Chloride Media by Basic Extractants

et al. 2018

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The solvent extraction of lanthanides from chloride media to an organic phase containing an anion exchanger in the chloride form is known to show low extraction percentages and small separation factors. The coordination chemistry of the lanthanides in combination with this kind of extractants is poorly understood. Previous work has mainly used solvent extraction based techniques (slope analysis, fittings of the extraction curves) to derive the extraction mechanism of lanthanides from chloride media. In this paper, EXAFS spectra, luminescence lifetimes, excitation and emission spectra and organic phase loadings of lanthanides in dry, water-saturated and diluted Aliquat 336 chloride or Cyphos IL 101 have been measured. The data show the formation of the hydrated lanthanide ion [Ln(H2O)8-9] 3+ in undiluted and diluted Aliquat 336 and the complex [LnCl6] 3in dry Aliquat 336. The presence of the same species [Ln(H2O)8-9] 3+ in the aqueous and in the organic phase explains the small separation factors and the poor selectivities for the separation of mixtures of lanthanides. Changes in separation factors with increasing chloride concentrations can be explained by changes in stability of the lanthanide chloro complexes in the aqueous phase, in combination with the extraction of the hydrated lanthanide ion to the organic phase. Finally, it is shown that the organic phase can be loaded with 107 g•L -1 of Nd(III) under the optimal conditions.

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The solvent extraction of rare earth elements from nitrate media with novel polyamides containing malonamide groups

Cited by 29 publications

References 23 publications

Coordination of Trivalent Lanthanides with Bismalonamide Ligands: Implications for Liquid–Liquid Extraction

Coordination of Trivalent Lanthanides with Bismalonamide Ligands: Implications for Liquid–Liquid Extraction

Alkylation and pre-organisation of diglycolamide ligands on flexible platforms for nuclear waste treatment

Mechanism for Solvent Extraction of Lanthanides from Chloride Media by Basic Extractants

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