Extraction behavior of uranium(VI), plutonium(IV), zirconium(IV), ruthenium(III) and europium(III) with γ-pre-irradiated solutions of N,N′-methylbutyl substituted amides in n-dodecane

Ruikar, P. B.; Nagar, Meena; Subramanian, M. S.; Gupta, Karan Kumar; Varadarajan, N.; Singh, Rajvir

doi:10.1007/bf02163724

Cited by 22 publications

(3 citation statements)

References 13 publications

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“…For unsymmetrical Nmethyl-N-butyl substituted amides in dodecane, again pre-equilibrated with 3.5 M nitric acid, the familiar decrease in D U was accompanied by increases in D Pu until radiolytically-induced third-phase formation occurred at about 700 kGy. [62] Similar results were obtained by the same researchers for symmetrical dihexylamides. [63] Mowafy and Aly [64] reported decreasing D U and increasing D Zr for DHOA and dihexyl(2-ethyl)hexylhexanamide irradiated as 0.5 M solutions in toluene, after preequilibration with 3 M nitric acid.…”

Section: Radiation Chemistry Of Actinide and Lanthanide Extractants 593supporting

confidence: 90%

Review Article: The Effects of Radiation Chemistry on Solvent Extraction 3: A Review of Actinide and Lanthanide Extraction

Mincher

Modolo

Mezyk

2009

Solvent Extraction and Ion Exchange

119

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Section: Radiation Chemistry Of Actinide and Lanthanide Extractants 593supporting

confidence: 90%

Review Article: The Effects of Radiation Chemistry on Solvent Extraction 3: A Review of Actinide and Lanthanide Extraction

Mincher

Modolo

Mezyk

2009

Solvent Extraction and Ion Exchange

119

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“…Most notably, N , N -dialkylamides are utilized in the Group ActiNide Extraction (GANEX) 1st cycle, and ARTIST processes, and are thought to degrade due to radiation at a rate either equal to or slower than TBP. − N , N -Dialkylamides exhibit a unique feature wherein if the acyl group is linear, both tetra and hexavalent actinides are extracted . However, if the acyl group is branched, as is the case for N , N -di-(2-ethylhexyl)isobutyramide (DEHiBA, Figure ), then hexavalent actinides are preferentially extracted over tetravalent cations, thereby affording the separation at the extraction step rather than through selective stripping. , …”

Section: Introductionmentioning

confidence: 99%

Extraction of Nitric Acid and Uranium with DEHiBA under High Loading Conditions

et al. 2023

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The mechanism by which high concentrations (1.5 M in n-dodecane) of N,N-di-2-ethylhexyl-isobutyramide (DEHiBA) extracts HNO3 and UO2(NO3)2 is under examination. Most prior studies have examined the extractant and the mechanism at a concentration of 1.0 M in n-dodecane; however, under the higher loading conditions that can be achieved by a higher concentration of extractant, this mechanism could change. Increased extraction of both nitric acid and uranium is observed with an increased concentration of DEHiBA. The mechanisms are examined by thermodynamic modeling of distribution ratios, 15N nuclear magnetic resonance (NMR) spectroscopy, and Fourier transform infrared (FTIR) spectroscopy coupled with principal component analysis (PCA). Speciation diagrams produced through thermodynamic modeling have been qualitatively reproduced through PCA of the FTIR spectra. The predominant extracted species of HNO3(DEHiBA), HNO3(DEHiBA)2, and UO2(NO3)2(DEHiBA)2 are in good agreement with prior literature reports for 1.0 M DEHiBA systems. Evidence for an additional species of either UO2(NO3)2(DEHiBA) or UO2(NO3)2(DEHiBA)2(HNO3) also contributing to the extraction of uranium species is given.

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“…It has been reported that N,N-disubstituted amides [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] and N-substituted cyclic amides [20][21][22] extract U(VI) effectively. The physicochemical properties of these compounds as the extractants can be tuned by the judicious choice of alkyl groups.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Uranium(VI) from Nitric Acid Solution Using Pyrrolidone Derivatives

Takahashi¹,

Hotokezaka²,

Noda³

et al. 2009

Journal of Nuclear Science and Technology

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The extraction behavior of uranyl species from HNO 3 aqueous solutions using CH 2 Cl 2 containing pyrrolidone derivatives as extractants has been studied to find an alternative to tributyl phosphate as an extractant. In this study, we used N-cyclohexyl-2-pyrrolidone (NCP), N-octyl-2-pyrrolidone (NOP), and N-dodecyl-2-pyrrolidone (NDP) as the extractants. As a result, it was found that NCP, NOP, and NDP (abbreviated as NRP) extract U(VI) as UO 2 (NO 3 ) 2 (NRP) 2 , that a part of NCP in CH 2 Cl 2 phase is moved to the aqueous phase, and that the extractability (corresponding distribution ratio) of U(VI) increases with increasing [HNO 3 ] int from 7% (0.08) (½HNO 3 int ¼ 0:1 M, ½NRP int ¼ 1:0 M) to more than 90% (11) (½HNO 3 int ¼ 3:0 M, ½NRP int ¼ 1:0 M). From these results, it is expected that NOP and NDP extract U(VI) effectively from HNO 3 solution of more than 3 M and that the extracted U(VI) species are stripped by using HNO 3 aqueous solution of low concentration.

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Extraction behavior of uranium(VI), plutonium(IV), zirconium(IV), ruthenium(III) and europium(III) with γ-pre-irradiated solutions of N,N′-methylbutyl substituted amides in n-dodecane

Cited by 22 publications

References 13 publications

Review Article: The Effects of Radiation Chemistry on Solvent Extraction 3: A Review of Actinide and Lanthanide Extraction

Review Article: The Effects of Radiation Chemistry on Solvent Extraction 3: A Review of Actinide and Lanthanide Extraction

Extraction of Nitric Acid and Uranium with DEHiBA under High Loading Conditions

Extraction of Uranium(VI) from Nitric Acid Solution Using Pyrrolidone Derivatives

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