Kinetics of Reactions of Np and Pu Ions with Hydrazine Derivatives: XVII. Reaction of Pu(VI) with Hydroxyethylhydrazine

Koltunov, V. S.; Pastushchak, V. G.; Mezhov, E.A.; Koltunov, G. V.

doi:10.1023/b:rach.0000024936.87231.c0

Cited by 10 publications

(12 citation statements)

References 2 publications

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“…DISCUSSION OF THE REACTION SCHEME As one can see, the obtained kinetic equations (2) and (4) were similar: they had the first order with respect to the metal, the negative order with respect to the acid and fractional positive order with respect to the reductant. The found values of the carbohydrazide reaction orders differed from the data of the other studies on Pu(VI) and Np(VI) reduction with various organic hydrazine derivatives [3][4][5][6]. In most cases, the order of the reaction with respect to reducing agent was less than 1.…”

Section: The Interaction Of the Np(vi) With Carbohydrazidecontrasting

confidence: 55%

INTERACTION OF Pu(VI) AND Np(VI) WITH CARBOHYDRAZIDE IN NITRIC ACID SOLUTIONS

Zavalina¹,

Dvoeglazov²,

Pavlyukevich³

et al. 2017

RAD Conference Proceedings

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Abstract. The kinetics of Pu(VI) and Np(VI) recovery by carbohydrazide in an aqueous nitric acid solution was researched spectrophotometrically. Regarding to Pu(VI) it was established that in the interval of [HNO3] = 0.75-3.0 M and [CO(N2H3)2] = 0.1-0.4 M, the reaction rate was proportional to the concentration of Pu(VI). The reaction order with respect to carbohydrazide was determined to be 2.3, and -3 to nitric acid. The found activation energy of the reaction was 111 kJ·mol −1 . Regarding Np(VI), it was found that in the interval of [HNO3] = 0.75-3.0 M and [CO(N2H3)2] = 0.03-0.12 M, the reaction rate was proportional to the Np(VI) concentration. Reaction order with respect to carbohydrazide was determined to be 1.15, and -1.35 with respect to nitric acid. The found activation energy of the reaction was 85 kJ·mol −1 . Based on this kinetic data, a possible fundamental reaction mechanism was theorized.

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Section: The Interaction Of the Np(vi) With Carbohydrazidecontrasting

confidence: 55%

INTERACTION OF Pu(VI) AND Np(VI) WITH CARBOHYDRAZIDE IN NITRIC ACID SOLUTIONS

Zavalina¹,

Dvoeglazov²,

Pavlyukevich³

et al. 2017

RAD Conference Proceedings

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“…On the other hand, propane, propene and n-butane are mainly generated by the reactions betweenÁCH 3 and ÁCH 2 CH 3 or two ÁCH 2 CH 3 radicals, while methane and ethane are produced by the reactions of DEHA with ÁCH 3 and ÁCH 2 CH 3 (Eqs. [11][12], since the concentration of ÁCH 3 and ÁCH 2 CH 3 is much lower than that of DEHA, the volume fraction of propane, propene and n-butane is much lower than that of methane and ethane.…”

Section: Light Hydrocarbon Generated By Irradiated Deha Solutionmentioning

confidence: 99%

“…N,N-diethyl-hydroxylamine [DEHA, (C 2 H 5 ) 2 NOH)] is a derivative of NH 2 OH, and it is also a kind of salt-free reductant, it is of appropriate reducing ability and excellent selectivity. Reports [10][11][12] show that DEHA not only reduces Np(VI) and Pu(IV) to Np(V) and Pu(III) that can not be extracted by TBP, but also stabilizes Np(V)and Pu(III) for a period of time in certain conditions [13]. The application of DEHA brings about none of nonvolatile, corrosive constituents and HN 3 into the process, so DEHA is a promising reductant.…”

Section: Introductionmentioning

confidence: 97%

γ-ray damage of N,N-diethyl-hydroxylamine in water and its radiolytic products at lower dose

Wang

et al. 2015

J Radioanal Nucl Chem

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N,N-Diethyl-hydroxylamine (DEHA) is a novel salt-free reductant used in the reprocessing of spent fuel, this paper reports on c-rays damage of 0.1-0.5 mol L -1 DEHA irradiated 5-25 kGy and its radiolytic products. DEHA is relative stable against radiation, its radiolysis rate increases with the dose, but decreases with increasing initial DEHA concentration. The main radiolytic products are hydrogen, ethene, methane, acetaldehyde and ammonium ion, their quantities increase with initial DEHA concentration. Hydrogen and liquid radiolytic products quantities increase with the dose, the dependence of hydrocarbon quantity on dose relates to original DEHA concentration and dose.

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“…In addition, for chemical reasons, the simultaneous presence of actinides, nitric acid, technetium and hydrazine in solution leads to numerous reactions which can proceed in parallel [14,15]. Reaction schemes (1)(2)(3)(4)(5)(6)(7) show several typical processes occurring in PUREX media.…”

Section: Introductionmentioning

confidence: 99%

“…Separation are practically not, the whole separation is mainly based on controlling the valence forms of Pu and Np. A large variety of compounds were tested and studied as reduction agents for plutonium and neptunium such as hydroxаmic acids [4,5], hydroxylamine [6,7] and hydrazine [8]. The latter is nowadays the most widely employed.…”

Section: Introductionmentioning

confidence: 99%