Influence of diluent on radiolysis of amides in organic solution

Sugo, Yumi; Izumi, Yoshinobu; Yoshida, Yasuhiko; Nishijima, Shigehiro; Sasaki, Yoshiyuki; Kimura, Takaumi; Sekine, Tsutomu; Kawamura, Hiroshi

doi:10.1016/j.radphyschem.2006.05.008

Cited by 85 publications

(62 citation statements)

References 16 publications

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“…Several studies have been performed to better understand the radiolysis phenomenon concerning the processes devoted to the separation of uranium and/or plutonium [1,[8][9][10] and to the co-extraction of MAs and lanthanides [11][12][13]. On the other hand, a lack of knowledge remains concerning the MAs stripping step, where the hydrophilic complexing agent is dissolved in diluted nitric acid and it is in contact with the loaded TODGA solution, which is a mixture of kerosene/1-octanol.…”

Section: Physico Chemical Properties Of Irradiated I-sanex Diluentsmentioning

confidence: 99%

“…In fact, this anion reacts with water by-products leading to the formation of nitrous anion [16,17], which plays a critical role in the redox chemistry of actinides, and thus on the effi ciency of the separation process [12,22]. Since nitrous anion immediately decomposes in acidic solutions, nitrate ion concentration was monitored [16].…”

Section: Spectroscopic Studymentioning

confidence: 99%

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Physico chemical properties of irradiated i-SANEX diluents

et al. 2015

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Abstract. The development of effective processes to recover minor actinides from spent nuclear fuel cannot leave out of consideration the evaluation of the impact of ionizing radiations on safety, fl uid dynamics and extraction effi ciency. It is common knowledge from the literature that radiation damage mainly affects the diluents and, indirectly, the extractants [1], but a lack of knowledge remains regarding the radiolytic behavior of innovative selective actinide extraction (i-SANEX) diluents [2,3]. As natural prosecution of the work already performed on diluted nitric acid solutions [4], 0.44 M nitric acid solutions were irradiated in contact with a mixture of kerosene + 5 vol.% 1-octanol by a Co-60 source at 2.5 kGy/h dose rate and up to 100 kGy absorbed dose, conditions of interest for the future industrial facility. Density, viscosity, acidity, nitrate anion concentration and phase transfers were systematically measured before and after -irradiation. This was performed because radiation-induced modifi cations of these parameters may induce alterations of both the fl uid dynamics and the separation performances of the extracting system. The results suggest that the fl uid-dynamics of the system should be unaltered. In fact, only slight alterations of the organic phase viscosity and of the aqueous phase acidity were measured after irradiation, suggesting the occurrence of limited phase transfers and of diluent by-products formation.

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Section: Physico Chemical Properties Of Irradiated I-sanex Diluentsmentioning

confidence: 99%

Section: Spectroscopic Studymentioning

confidence: 99%

Physico chemical properties of irradiated i-SANEX diluents

et al. 2015

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“…Sugo et al postulated that it is a reactant that could undergo electron transfer reactions with the amidic fuel cycle ligand tetraoctyldiglycolamide (TODGA, Fig. 1), [14,15] and Zarzana et al reported the rate constant for the TODGA reaction with this species to be diffusion limited. [16] However, no corresponding work has been done for CMPO.…”

Section: Introductionmentioning

confidence: 99%

The role of organic solvent radical cations in separations ligand degradation

Mezyk

Mincher

Dhiman

et al. 2015

J Radioanal Nucl Chem

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The dodecane radical cation reaction rate constant with CMPO was measured using ps electron pulse radiolysis/ absorption spectroscopy as k = (1.30 ± 0.11) 9 10 10 M -1 s -1 in dodecane/0.10 M CH 2 Cl 2 solution. No reactivity increase occurred when these solutions were pre-contacted with nitric acid, similar to the behavior observed for TODGA. To corroborate these kinetic data with steady-state radiolysis measurements, where acid pre-contacted CMPO showed significantly less degradation, it is proposed that the dodecane radical cation always reacts directly with TODGA, but for CMPO the charge-transfer occurs with the CMPOÁHNO 3 complex formed in the acid contacted solvent.

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“…The radiolytic stability of many of the solvents used for MA partitioning, including D 3 DODGA has been studied in detail [22][23][24][25][26][27][28][29]. In all these studies, the extent of degradation of the solvent has been assessed based on the measure of distribution ratio or the chemical up-take of the tri-valent lanthanides and actinides ions by the solvent before and after irradiation.…”

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

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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.

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Influence of diluent on radiolysis of amides in organic solution

Cited by 85 publications

References 16 publications

Physico chemical properties of irradiated i-SANEX diluents

Physico chemical properties of irradiated i-SANEX diluents

The role of organic solvent radical cations in separations ligand degradation

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

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