Extraction Behavior of Some Actinides and Fission Products from Nitric Acid Medium by a New Unsymmetrical Diglycolamide

Ravi, Jammu; Suneesh, A.S.; Prathibha, T.; Venkatesan, K. A.; Antony, M. P.; Srinivasan, T. G.; Rao, P. R. Vasudeva

doi:10.1080/07366299.2011.539421

Cited by 54 publications

(20 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previously we also reported the LOC of nitric acid and Nd(III) in some UDGAs [14,15]. The LOC values increased with increase in the chain length of alkyl group attached to amidic nitrogen atom, which was in good agreement with the results reported in the litera- , -di-2-ethylhexyl-, -di-octyl diglycolamide [13,14].…”

Section: Third Phase Formationsupporting

confidence: 88%

“…However, the distribution ratio of Eu(III) is higher than that of Am(III) for all UDGAs at all the acidities studied. A similar observation was also reported by others in symmetrical DGA systems [13]. The separation factor (= Eu(III) / Am(III) ) of Eu(III) over Am(III) in various DGA systems are shown in Table 1.…”

Section: Extraction Of Metal Ionssupporting

confidence: 75%

“…Our previous studies [13,15] with UDGAs indicated that the introduction of unsymmetry in diglycolamides decreased the extraction of Sr(II). Therefore, the separation factor of Am(III) over Sr(II) achieved in those UDGAs were quite high as compared to that in symmetrical DGAs.…”

Section: Strontium Extractionmentioning

confidence: 99%

“…In this context, we developed several unsymmetrical diglycolamide (UDGA) ligands and evaluated for the extraction of trivalent metal ions from nitric acid medium [13][14][15][16][17][18][19][20]. Unlike the symmetrical DGAs, the structure of alkyl groups attached to the amidic nitrogen atom in UDGAs are different.…”

Section: Introdutionmentioning

confidence: 99%

See 3 more Smart Citations

New unsymmetrical digycolamide ligands for trivalent actinide separation

Ravi¹,

Venkatesan²,

Antony³

et al. 2014

Radiochimica Acta

Self Cite

View full text Add to dashboard Cite

New unsymmetrical diglycolamides (UDGAs),, -di-butyl-, -di-dodecyl-3-oxapentane-1,5-diamide (C 12 -C 4 ), , -di-dodecyl-, -di-hexyl-3-oxapentane-1,5-diamide (C 12 -C 6 ), , -di-decyl-, -di-dodecyl-3-oxapentane-1,5-diamide (C 12 -C 10 ) have been synthesized, and evaluated for the separation of americium(III) and europium(III) from nitric acid medium. The extraction behavior of Am(III), Eu(III), and Sr(II) in a solution of these UDGAs in -dodecane was studied as a function of concentration of nitric acid in the aqueous phase. The distribution ratio of Am(III) and Eu(III) increased with increase in the concentration of nitric acid. The third phase formation behavior of nitric acid and neodymium(III) in 0.1 M UDGA/ -dodecane was studied. The third phase formation was not observed in all these UDGAs in -dodecane (0.1 M), when the concentration of Nd(III) was ∼ 500 mM in 3-4 M nitric acid. The stoichiometry of Am(III)-UDGA was determined from the slope analysis of the extraction data, which indicated the formation of 1 : 3 complex in all cases.Our studies revealed that the UDGA ligands with dodecyl group attached to one amidic nitrogen atom is inevitable for preventing third phase formation and the alkyl group at the other amidic nitrogen can be varied from butyl to decyl group for obtaining efficient extraction of trivalent actinides from high-level nuclear waste.Partitioning of long-lived minor actinides from high-level liquid waste (HLLW) resulting from reprocessing of spent nuclear fuel, and their subsequent transmutation into stable products is being considered as the best strategy for the safe management of HLLW. Diglycolamide (DGA) class of ligands have received much attention in the recent past for the separation of trivalent actinides (Am(III) and Cm(III)) from nitric acid medium [1]. These reagents are alkyl-3-oxapenatene-1,5-diamide derivatives containing three oxygen donor atoms in the molecule for tridentate coordination [2]. It is realized that the co-ordination chemistry, extraction and other properties of these DGAs vary significantly with the nature of alkyl substituents attached to the amidic nitrogen atom. When the alkyl group was octyl or higher, the solubility of DGA was quite low in aqueous phase, and that in a nuclear diluent, -dodecane was high. Increasing the chain length of alkyl group, in general, decreased the distribution ratio as well as the third phase formation tendency during the extraction of trivalent metal ions from nitric acid medium [3,4]. The third phase formation is an undesirable event, namely the splitting of organic phase into two phases, during the course of solvent extraction. This phenomenon usually occurs when concentration of metal ion in the organic phase exceeds a particular value, referred as limiting organic concentration (LOC), and the corresponding aqueous phase concentration referred as critical aqueous concentration (CAC) [5].In view of above, several researchers proposed the symmetrical octyl-derivatives of DGA, namely, , , , -tetraoctyl diglycolamide (TODGA) an...

show abstract

Section: Third Phase Formationsupporting

confidence: 88%

Section: Extraction Of Metal Ionssupporting

confidence: 75%

Section: Strontium Extractionmentioning

confidence: 99%

Section: Introdutionmentioning

confidence: 99%

See 2 more Smart Citations

New unsymmetrical digycolamide ligands for trivalent actinide separation

Ravi¹,

Venkatesan²,

Antony³

et al. 2014

Radiochimica Acta

Self Cite

View full text Add to dashboard Cite

show abstract

“…This extractant has the advantage over TODGA and T2EHDGA with respect to having better separation factor and higher limits for third phase formation without the addition of phase modifiers. The process of synthesis, extraction of trivalent actinides and their stripping studies using the newly synthesized, D 3 DODGA, is discussed elsewhere [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of hydrodynamic suitability of N,N-didodecyl N′,N′-di-octyl diglycolamide: a potential candidate for minor actinide partitioning

Rajeswari

Antony

Rao

2015

J Radioanal Nucl Chem

Self Cite

View full text Add to dashboard Cite

An unsymmetrical diglycolamide namely N,N, didodecyl-N 0 ,N 0 -dioctyl diglycolamide developed in our laboratory is evaluated for its hydrodynamic suitability by determining the changes in its physical properties such as density and viscosity as a function of temperature and compared with those of tri n-butyl phosphate and N,N,N 0 ,N 0 -tetraoctyl diglycolamide. The effect of irradiation on density, viscosity and interfacial tension, up to a dose of 1000 kGy are also measured. In addition, the activation energy for the viscous flow (E vis ) were obtained for these pure solvents and their binary mixtures with n-dodecane in the temperature range 20-65°C using the Andrade's equation.

show abstract

Innovative Coupled Hydrometallurgical and Pyrochemical Processes for Rare Earth Recycling

Andreiadis

Blet

Serp

et al. 2018

The Minerals, Metals &Amp; Materials Series

View full text Add to dashboard Cite

Critical supply of rare earth elements (REE) Rare earth elements are critical raw materials Demand growing, especially for magnets (> 7% per year for Nd) Accelerated growth of HEV/EV market (+30% in 2017) Global REO production in 2018 estimated at 175 kT/yr Production chain concentrated in China (mining, separation, downstream manufacturing, R&D capacity): 80% world REO supply Currently no European mine in operation Significant price volatility during the last 10 years Importance Supply risk

show abstract

Extraction Behavior of Some Actinides and Fission Products from Nitric Acid Medium by a New Unsymmetrical Diglycolamide

Cited by 54 publications

References 25 publications

New unsymmetrical digycolamide ligands for trivalent actinide separation

New unsymmetrical digycolamide ligands for trivalent actinide separation

Evaluation of hydrodynamic suitability of N,N-didodecyl N′,N′-di-octyl diglycolamide: a potential candidate for minor actinide partitioning

Innovative Coupled Hydrometallurgical and Pyrochemical Processes for Rare Earth Recycling

Contact Info

Product

Resources

About