Studies on the Parallel Synthesis and Evaluation of New Heterocyclic Extractants for the Partitioning of Minor Actinides

Hudson, Michael J.; Foreman, Mark; Hill, C.; Huet, Nathalie; Madic, C.

doi:10.1081/sei-120024549

Cited by 32 publications

(34 citation statements)

References 31 publications

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“…The extractants were synthesized as follows: Diethylhemi-BTP, 6-(5,6-diethyl-1,2,4-triazin-3-yl)-2,2'-bipyridine as described elsewhere [5] and di(benzyloxyphenyl)hemi-BTP, 6-[5,6-di(benzyloxyphenyl)-1,2,4-triazin-3-yl]-2,2'-bipyridine, was formed using a similar procedure. .55 ppm) was made using 3,3'-dibenzyloxybenzil in a reaction analogous to that used to prepare diethylhemi-BTP with the modification that the product was purified by chromatography on silica (mobile phase CH 2 Cl 2 /EtOAc/EtOH, N.B.…”

Section: Methodsmentioning

confidence: 99%

Solvent extraction of Am(III) and Eu(III) from nitrate solution using synergistic mixtures of N-tridentate heterocycles and chlorinated cobalt dicarbollide

et al. 2006

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The separation by solvent extraction of 241 Am(III) from 152 Eu(III), in 1 M NaNO 3 weakly acidic (pH 4) aqueous solutions, into dilute (ca. 10 -2 M) solutions of triazinylbipyridine derivatives (diethylhemi-BTP or di(benzyloxyphenyl)hemi-BTP) and chlorinated cobalt dicarbollide (COSAN) in 1-octanol or nitrobenzene has been studied. The N-tridentate heterocyclic ligands, which are selective for Am(III) over Eu(III), secured efficient separation of the two metal ions, while COSAN, strongly hydrophobic and fully dissociated in polar diluents, enhanced the extraction of the metal ions by ion-pair formation. Molecular interactions between the two co-extractants, observed at higher concentrations, led to the precipitation of their 1: 1 molecular adduct. In spite of that, efficient separations of Am and Eu ions were attained, with high separation factors, SF Am/Eu of 40 and even 60, provided the concentration of hemi-BTP was significantly greater than that of COSAN. Excess COSAN concentrations caused an antagonistic effect, decreasing both the distribution ratio of the metal ions and their separation factor.

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Section: Methodsmentioning

confidence: 99%

Solvent extraction of Am(III) and Eu(III) from nitrate solution using synergistic mixtures of N-tridentate heterocycles and chlorinated cobalt dicarbollide

et al. 2006

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“…• terpyridines (Drew et al, 2000a); • monopyridyl-1,2,4-triazines (Hudson et al, 2003a) and dipyridyl-1,2,4-triazines (Boubals et al, 2002, Hudson et al, 2003a; • dipyridyl-1,3,5-triazines (Drew et al, 2000b) and tripyridyl-1,3,5-triazines (Chan et al, 1996, Hagström et al, 1999; • dioxa-/benzoxa-/binzimida-/zol-pyridines (Kolarik and Müllich, 1997, Andersson et al, 2003, Weigl et al, 2003, Drew et al, 2004b; • amino-dipyridyl-1,3,5-triazines (ADPTZ).…”

Section: Separation Of Trivalent 5f Elements From 4f Elements By Nitrmentioning

confidence: 99%

Development of highly selective compounds for solvent extraction processes: partitioning and transmutation of long-lived radionuclides from spent nuclear fuels

Hill¹

2011

Advanced Separation Techniques for Nuclear Fuel Reprocessing and Radioactive Waste Treatment

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“…The compositions of these three solvents were chosen as follows: CMPO was provided by Xymax Company (Boca Raton, Florida, US), α-cyanocapric acid, DMDBTDMA and DMDOHEMA were synthesized by Pharmasynthèse Laboratory (Paris, France), TBP and TPTZ were purchased from Aldrich and TPH from Novasep Company (Pompey, France), iPr-BTP was synthesized at CEA-Marcoule [5]. All these reagents were used without further purification.…”

Section: Preparation Of the Intercomparison Campaignmentioning

confidence: 99%

Assessment of ligand extraction properties: an intercomparison campaign amongst EUROPARTners

Hill¹,

Desreux²,

Ekberg³

et al. 2008

Radiochimica Acta

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An intercomparison campaign was organized at the beginning of the European FP6 EUROPART Integrated Project, among the partners involved in the assessment of the extracting properties of novel ligands, in order to check their accuracy and reliability when determining metal cation distribution ratios. Three different extracting systems, presenting various selectivity and affinity towards trivalent actinides were selected: (i) CMPO, (ii) TPTZ and (iii) BTP. Although some differences could be pointed out in the implementation of liquid-liquid extraction tests, the distribution ratios measured by the nine partners were fairly reproducible (< 20% deviation) for the first two extracting systems. However, large discrepancies occurred when testing the third extracting system, due to its strong hydrolytic instability, thus pointing out the difficulty of assessing extraction properties of instable ligands.

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Studies on the Parallel Synthesis and Evaluation of New Heterocyclic Extractants for the Partitioning of Minor Actinides

Cited by 32 publications

References 31 publications

Solvent extraction of Am(III) and Eu(III) from nitrate solution using synergistic mixtures of N-tridentate heterocycles and chlorinated cobalt dicarbollide

Solvent extraction of Am(III) and Eu(III) from nitrate solution using synergistic mixtures of N-tridentate heterocycles and chlorinated cobalt dicarbollide

Development of highly selective compounds for solvent extraction processes: partitioning and transmutation of long-lived radionuclides from spent nuclear fuels

Assessment of ligand extraction properties: an intercomparison campaign amongst EUROPARTners

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