The behaviour of organic solvents containing C5-BTBP and CyMe4-BTBP at low irradiation doses

Retegan, Teodora; Ekberg, Christian; Englund, Sofie; Fermvik, Anna; Foreman, Mark; Skarnemark, Gunnar

doi:10.1524/ract.2007.95.11.637

Cited by 38 publications

(30 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One interpretation of this correlation is that the lipophilic ion pair It is also apparent that the distribution ratio increases with increasing [HNO 3 ] and this trend is also observed with CyMe 4 -BTBP 3 [40] and the other BTBPs. [28][29][30][31][32][33][34][35][36][37][38] The maximum D value observed was 0.46 from 4 M HNO 3 . and the highest separation factor observed was 22 at 2 M HNO 3 .…”

Section: Resultsmentioning

confidence: 99%

“…[28][29][30][31][32][33][34][35][36][37][38] These ligands showed lower binding affinities towards americium(III) which allowed stripping to occur using either dilute nitric acid or glycolic acid. However, the 6,6'-bis(5,6-dialkyl-1,2,4-triazin-3-yl)-2,2'-bipyridines (Cn-BTBPs, n = 1-5) were subjected to both acidic hydrolysis and radiolytic degradation by removal of their labile benzylic hydrogen atoms by free-radical species.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Separation of Americium(III) from Europium(III) by Two New 6,6'-Bistriazinyl-2,2'-Bipyridines in Different Diluents

Harwood

Lewis

Hudson

et al. 2011

Solvent Extraction and Ion Exchange

View full text Add to dashboard Cite

The synthesis and extraction of americium(III) and europium(III) from aqueous nitric acid solutions by the new BTBP ligands 6,6'-bis (5,5,7,7-tetramethyl-5,7-dihydrofuro[3,4-e]-1,2,4-triazin-3-yl)-2,2'-bipyridine (Cy 5 -O-Me 4 -BTBP) and 6,6'-bis (5,5,7,7-tetramethyl-5,7-dihydrothieno[3,4-e]-1,2,4-triazin-3-yl)-2,2'-bipyridine (Cy 5 -S-Me 4 -BTBP) is described. The affinity for Am(III) and the selectivity for Am(III) over Eu(III) of Cy 5 -S-Me 4 -BTBP were generally higher than for Cy 5 -O-Me 4 -BTBP. For both ligands, the extraction of Am(III) and Eu(III) from 3 M HNO 3 into 3 mM organic solutions varied with the diluent used. The highest distribution ratios and separation factors observed were in cyclohexanone and 2-methylcyclohexanone, respectively. For Cy 5 -S-Me 4 -BTBP, there is a strong correlation between the distribution ratio for Am(III) and the permittivity of the diluent used. With 1-octanol as the diluent, low distribution ratios (D(Am) < 1) were observed for Cy 5 -S-Me 4 -BTBP although this ligand extracts Am(III) selectively (SF Am/Eu = 16-46 from 1-4 M HNO 3 ). For Cy 5 -S-Me 4 -BTBP, Am(III) is extracted as the disolvate. The distribution ratios for Am(III), and the separation factors for Am(III) over Eu(III) are both significantly higher for CyMe 4 -BTBP than they are for Cy 5 -O-Me 4 -BTBP and Cy 5 -S-Me 4 -BTBP in cyclohexanone. Changing the diluent from cyclohexanone to 2-methylcyclohexanone leads to a decrease in D(Am) but an increase in SF Am/Eu for Cy 5 -S-Me 4 -BTBP.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Separation of Americium(III) from Europium(III) by Two New 6,6'-Bistriazinyl-2,2'-Bipyridines in Different Diluents

Harwood

Lewis

Hudson

et al. 2011

Solvent Extraction and Ion Exchange

View full text Add to dashboard Cite

show abstract

“…One BTBP molecule, C5-BTBP (6,6 -bis(5,6-dipentyl- [1,2,4]triazine-3-yl)- [2,2 ]bipyridine) [6] see Fig. 1, showed promising distribution ratios and separation factors but it proved to lack radiolytic stability [5][6][7]. Irradiation of an organic solvent containing C5-BTBP leads to a decrease in extraction, thus rendering it useless for industrial applications.…”

Section: Figmentioning

confidence: 99%

Radiolysis of C5-BTBP in cyclohexanone irradiated in the absence and presence of an aqueous phase

Fermvik¹,

Aneheim

Grüner

et al. 2012

Radiochimica Acta

Self Cite

View full text Add to dashboard Cite

Spent nuclear fuel contains many highly radioactive species; hence solvents used in reprocessing will be subjected to radiolysis. In this study, solvents containing one of the BTBP molecules intended for the separation of trivalent actinides and lanthanides, the so called C5-BTBP, have been subjected to radiolysis and hydrolysis. We present here that this compound shows a dramatic decrease in both distribution ratios and separation factor when irradiated with higher doses up to 50 kGy; particularly in the presence of an aqueous phase. Furthermore, fast hydrolytic degradation is observed, which significantly contributes to the overall degree of decomposition. This is supported by speciation studies performed by HPLC and LC-MS methods. Proposed structures of the highest-yield degradation products are presented and they seem to confirm previously drawn structures for these products. From these studies it can be concluded that the presence of nitric acid or nitrate during irradiation leads to higher content of species containing keto groups.

show abstract

“…The spike solution contained 152 Eu and 241 Am. The radiotracers used for the experiments in Jülich, Germany, were provided by Isotopendienst M.Blaseg GmbH, Waldburg, Germany, while the radiotracers used in Gothenburg, Sweden, were prepared from laboratory stock solutions [22].…”

Section: Theorymentioning

confidence: 99%

Influence of dose rate on the radiolytic stability of a BTBP solvent for actinide(III)/lanthanide(III) separation

Fermvik¹,

Ekberg

Englund³

et al. 2009

Radiochimica Acta

Self Cite

View full text Add to dashboard Cite

Irradiation / Dose rate / Solvent extraction / Partitioning / Actinides / Lanthanides / Distribution ratio / Separation factorSummary. The recently developed ligand MF2-BTBP dissolved in cyclohexanone is a promising solvent for the group separation of trivalent actinides(III) from the lanthanides(III). Its high stability against nitric acid has been demonstrated recently. Since the solvent is also exposed to a continuously high radiation level in the counter current process, the radiolytic stability of the solvent was examined in this study. Irradiation experiments were carried out up to an absorbed dose of 100 kGy and the effect of the dose rate was investigated. The extraction behaviour for An(III)/Ln(III) separation was studied after radiolysis for evaluation. It was found that during high dose rate irradiation the extraction efficiency for both Am(III) and Eu(III) decreased significantly with increasing absorbed dose, whereas during the low dose rate irradiation the extraction efficiencies remained more or less at the same level.

show abstract

The behaviour of organic solvents containing C5-BTBP and CyMe4-BTBP at low irradiation doses

Cited by 38 publications

References 10 publications

The Separation of Americium(III) from Europium(III) by Two New 6,6'-Bistriazinyl-2,2'-Bipyridines in Different Diluents

The Separation of Americium(III) from Europium(III) by Two New 6,6'-Bistriazinyl-2,2'-Bipyridines in Different Diluents

Radiolysis of C5-BTBP in cyclohexanone irradiated in the absence and presence of an aqueous phase

Influence of dose rate on the radiolytic stability of a BTBP solvent for actinide(III)/lanthanide(III) separation

Contact Info

Product

Resources

About