Study of thermal and radiation stability of the extractant based on CMPO in fluorinated sulfones

MRS Advances ◽  
2016 ◽  
Vol 2 (12) ◽  
pp. 641-647 ◽  
Author(s):  
S.V. Stefanovsky ◽  
I.V. Skvortsov ◽  
E.V. Belova ◽  
A.V. Rodin
Keyword(s):  
Aqueous Solution ◽  
Nitric Acid ◽  
Dose Rate ◽  
Electron Accelerator ◽  
Radiation Stability ◽  
Two Phase ◽  
Absorbed Doses ◽  
Phase Systems ◽  
Kinetics Of ◽  
Autocatalytic Oxidation

ABSTRACTThe two-phase systems of pure diluent FS-13 – aqueous solution of 14 mol/L nitric acid and 0.02 mol/L solution of CMPO in diluent FS-13 – aqueous solution of 14 mol/L HNO3 were studied at autoclave temperatures 170 °C and 200 °C. The effect of pre-irradiation on the kinetics of thermolysis was determined. All samples were irradiated using an electron accelerator at a dose rate of 10 kGy/h up to absorbed doses of 0.1, 0.5 and 1 MGy. The parameters of heat and gas emissions were determined during thermolysis of the studied extraction system in a closed apparatus. It has been shown that the conditions required for the growth of autocatalytic oxidation are not created during heating of the two-phase systems in closed vessels even for the extraction systems contacted with 14 mol/l HNO3 for two weeks.

Dynamics of gas release during thermal oxidation of TBP solutions in Isopar-M in two-phase system

MRS Advances ◽  
2018 ◽  
Vol 3 (21) ◽  
pp. 1181-1190
Author(s):  
Elena V. Belova ◽  
Zayana V. Dzhivanova ◽  
Boris F. Myasoedov ◽  
Sergey V. Stefanovsky
Keyword(s):  
Thermal Oxidation ◽  
Electron Accelerator ◽  
Phase System ◽  
Phase Extraction ◽  
Gas Release ◽  
Gas Emission ◽  
Two Phase ◽  
Phase Systems ◽  
Kinetics Of ◽  
Autocatalytic Oxidation

ABSTRACTThe dynamics of the gas release at thermal oxidation of the two-phase systems of 30% solution of tri-n-butyl phosphate (TBP) in isoparaffinic diluent Isopar M – aqueous solution of 4.3, 8.2 and 12 mol/L of HNO3 has been investigated within the temperature range from 70°C to 110°C. The effect of pre-irradiation of the system TBP–Isopar-M–HNO3 on the kinetics of its thermolysis has been determined. All of the samples were irradiated with an electron accelerator at a dose rate of 10 kGy/h up to integrated doses of 0.5, 1 and 2 MGy. The parameters of heat and gas emission during thermolysis of the tested extraction system in an open apparatus have been determined experimentally. It has been demonstrated, that there are no conditions for extension of autocatalytic oxidation under heat treatment of two-phase extraction systems in open vessels.

Kinetics of thermochemical reaction of TBP solutions in HCBD with nitric acid in two-phase systems

2008 ◽  
Vol 50 (2) ◽  
pp. 171-175 ◽  
Author(s):  
G. F. Egorov ◽  
E. V. Belova ◽  
G. P. Tkhorzhnitskii ◽  
I. G. Tananaev ◽  
E. R. Nazin ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Two Phase ◽  
Phase Systems ◽  
Kinetics Of ◽  
Thermochemical Reaction

On the kinetics of phase separation in aqueous two-phase systems

1998 ◽  
Vol 711 (1-2) ◽  
pp. 319-329 ◽  
Author(s):  
M.H Salamanca ◽  
J.C Merchuk ◽  
B.A Andrews ◽  
J.A Asenjo
Keyword(s):  
Phase Separation ◽  
Two Phase ◽  
Aqueous Two Phase Systems ◽  
Phase Systems ◽  
Kinetics Of

Coarsening kinetics of intermetallic precipitates in Ni75AlxV25−x alloys

2007 ◽  
Vol 22 (1) ◽  
pp. 61-67 ◽  
Author(s):  
Y.S. Li ◽  
Z. Chen ◽  
Y.L. Lu ◽  
Y.X. Wang
Keyword(s):  
Dynamic Scaling ◽  
Two Phase ◽  
Elastic Interactions ◽  
Initial Stage ◽  
Intermetallic Precipitates ◽  
Plate Shape ◽  
Phase Systems ◽  
Coarsening Kinetics ◽  
Kinetics Of ◽  
Late Stages

The precipitation kinetics of growth and coarsening of γ′(Ni3Al) and θ (Ni3V) in Ni75AlxV25−x alloys were investigated by microscopic phase-field simulation incorporated with elastic interactions. For the elastic interactions, γ′ aligned along the 〈001〉 direction and θ aligned along the [100] direction, which resulted in plate shape. For the lower (x < 4, at.%) and higher (x > 6) content regions, the growth of first precipitates was dominant at the initial stage and then coarsening was dominant, but the growth and coarsening proceeded simultaneously for the second precipitates. The growth and coarsening of γ′ and θ were dominant, respectively, at the initial and late stages for middle content regions. In addition, dynamic scaling was analyzed in the two-phase systems. It was shown that the dynamic scaling regimes were attained simultaneously at late-stage coarsening for γ′ and θ, despite the different precipitation order.

Distribution of HDBP in two-phase systems consisting of aqueous nitric acid, organic diluent (with or without TBP), and HDBP or its zirconium salt

2007 ◽  
Vol 49 (4) ◽  
pp. 391-396 ◽  
Author(s):  
B. Ya. Zilberman ◽  
N. D. Goletskii ◽  
O. V. Shmidt ◽  
E. A. Puzikov ◽  
I. V. Blazheva ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Two Phase ◽  
Phase Systems ◽  
Aqueous Nitric Acid

Kinetics of thermochemical reaction of TBP solutions in HCBD with nitric acid in single-phase systems

2008 ◽  
Vol 50 (2) ◽  
pp. 168-170 ◽  
Author(s):  
G. F. Egorov ◽  
E. V. Belova ◽  
G. P. Tkhorzhnitskii ◽  
I. G. Tananaev
Keyword(s):  
Nitric Acid ◽  
Single Phase ◽  
Phase Systems ◽  
Kinetics Of ◽  
Thermochemical Reaction
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