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RISS 인기검색어
- 검색키워드
- 저자 : Belova, E.V. (검색결과 9 건)
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Exothermic processes in nitric acid solutions imitating highly active raffinate
Belova E.V.,Kalistratova V.V.,Obedkov A.S. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.10
The thermal stability of nitric acid solutions after contact with non-irradiated and irradiated tributyl phosphate (TBP) and its solution in Isopar-M has been studied. It has been established that exothermic processes occur during heating due to the interaction of soluble radiolysis products and the decomposition of the extractant with nitric acid. Such processes can occur at temperatures below 100 C, but unlike a thermal explosion that occurs in seconds, they are longer in time and are accompanied by weak heat evolution. Their intensity depends on the composition of the extractant, the concentration of HNO3, and the volume ratio of the organic and aqueous phases. The presence of extractant degradation products in raffinates does not pose a risk of a rapid evolution of gaseous products during evaporation, however, the presence of reducing agents can significantly increase the intensity of the exothermic decomposition of raffinates
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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.
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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.
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A study of thermolysis of irradiated diamide-containing extraction systems with nitric acid
I.V. Srvortsov,E.V. Belova,I.P. Sokolov,A.V. Rodin,S.V. Stefanovsky,B.F. Mysoedov 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.8
The dynamics of gas release at thermal oxidation of extraction systems on the basis of diamides ofdicarbonic acids in fluorinated sulphones with 14 mol/L HNO3 was investigated. The effect of preirradiationof the mixtures with accelerated electrons on the kinetics of their thermolysis was determined. The mixtures were heated in an autoclave at temperatures of 170 and 200 C and irradiated usingan electron accelerator to absorbed doses of 0.1, 0.5, and 1.0 MGy. It has been shown that no conditionsfor autocatalytic oxidation at thermolysis of extraction mixtures irradiated up to a dose of 1 MGy weredeveloped.
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Phase equilibria and thermodynamic properties in the o-dichlorobenzene - mdichlorobenzene system
Konstantin Samukov,Aleksey Maksimov,Ekaterina Belova,Mikhail Bubenchikov,Irina Uspenskaya 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.12
Rankine cycle is widely used in industry to convert heat to work using a working fluid. A mixture of oandm-isomers of dichlorobenzene can act efficiently as a working fluid in the cycle. An equation of state (EoS) approachwas chosen to model vapor-liquid equilibria and phase properties in the system. The best results were achieved withTsai-Chen EoS. Experimental measurements of volumetric properties of mixtures and solid-liquid equilibria were performed. These data were correctly predicted within the ideal assumption. An enthalpy-pressure diagram for the odichlorobenzene- m-dichlorobenzene system was calculated using the resulting EoS.
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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.
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Overview of results from the National Spherical Torus Experiment (NSTX)
Gates, D.A.,Ahn, J.,Allain, J.,Andre, R.,Bastasz, R.,Bell, M.,Bell, R.,Belova, E.,Berkery, J.,Betti, R.,Bialek, J.,Biewer, T.,Bigelow, T.,Bitter, M.,Boedo, J.,Bonoli, P.,Boozer, A.,Brennan, D.,Breslau IOP Publishing 2009 Nuclear fusion Vol.49 No.10
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Overview of physics results from the conclusive operation of the National Spherical Torus Experiment
Sabbagh, S.A.,Ahn, J.-W.,Allain, J.,Andre, R.,Balbaky, A.,Bastasz, R.,Battaglia, D.,Bell, M.,Bell, R.,Beiersdorfer, P.,Belova, E.,Berkery, J.,Betti, R.,Bialek, J.,Bigelow, T.,Bitter, M.,Boedo, J.,Bono IOP Publishing 2013 Nuclear fusion. Fusion nucléaire. &n.Illiga Vol.53 No.10
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