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Skvortsov, I.V.,Belova, E.V.,Yudintsev, S.V. Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.9
The gas evolution from mixtures consisting of 0.2 M solution of N,N,N',N'-tetra-n-octyldiglycolamide (TODGA) in n-alcohol (n-decanol or n-nonanol) with Isopar-M diluent was investigated during thermal oxidation. The effect of ionizing radiation on their thermal stability has been studied. It has been determined that the volume of gaseous thermolysis products increases by 260% in the case of n-nonanol and 80% in the case of n-decanol compared to non-irradiated solutions. It has been shown that the gas evolution rate and gas volume increase when the irradiated mixture saturated with nitric acid is heated. However, there are no prerequisites for the development of autocatalytic oxidation.
E.V. Belova,I.V. Skvortsov,M.I. Kadyko,S.V. Yudintsev 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.4
Hydrodynamic properties have been investigated for promising extraction systems: 0.05 mol L-1 solutionsof di(N-ethyl-4-ethylanilide) of 2,20-bipyridine-6,60-dicarboxylic acid, di(N-ethyl-4-fluoroanilide) of2,6-pyridinedicarboxylic acid and di(N-ethyl-4-hexylanilide) of 2,20-bipyridine-6,60-dicarboxylic acid inmeta-nitrobenzotrifluoride (F-3) or trifluoromethylphenyl sulfone (FS-13) diluents. To evaluate theperspectives for their use as extraction mixtures at the final stage of the nuclear fuel cycle, the change indensity, viscosity, surface tension, and phase separation rate under irradiation with accelerated electronswas studied. The concentrations of extractants in the irradiated mixtures have been determined and theradiation-chemical yields have been calculated. Irradiation significantly decreases the phase separationrate at the stages of extraction and back extraction for all the studied systems. The viscosity of the DYP-7solution in FS-13 increase above the values suitable for its use in extraction processes.
Obedkov A.S.,Kalistratova V.V.,Skvortsov I.V.,Belova E.V. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.9
The thermal stability of carbohydrazide, hydrazine nitrate, acetohydroxamic acid in nitric acid solutions has been studied at atmospheric pressure and above atmospheric pressure. The volumes of gaseous products of thermolysis and the maximum rate of gas evolution have been determined at atmospheric pressure. It has been shown that, despite the high rate of gas evolution and large volumes of evolved gases, the conditions for the development of autocatalytic oxidation are not created. Exothermic processes are observed in a closed vessel in the temperature range of 50e250 C. With an increase in the concentration of nitric acid, the temperatures of the onset of exothermic effects for all mixtures decrease, and the values of the total thermal effects of reactions increase, to the greatest extent for solutions with carbohydrazide.