-
Article
Effect of radiation and heating on acid products of acetic acid radiolysis in concentrated nitrate solution
Radiolysis and thermolysis of glyoxalic, glycolic, and succinic acids in aqueous nitrate and nitrate-nitric acid solutions were studied. The radiolysis of the acids occurs with the participation of nitric acid...
-
Article
Kinetics of thermochemical reaction of TBP solutions in HCBD with nitric acid in single-phase systems
The reaction of 30% solutions of TBP in hexachlorobutadiene (HCBD) with dissolved HNO3 at its initial concentration of 1.2 M was studied in the range from 90 to 150°C. The kinetic parameters of HNO3 consumption, ...
-
Article
Kinetics of thermochemical reaction of TBP solutions in HCBD with nitric acid in two-phase systems
The kinetics of thermochemical reaction of 30% TBP in hexachlorobutadiene (HCBD) saturated with HNO3 (1.35 M HNO3) in two-phase systems with 12 M HNO3 at temperatures from 90 to 115°C was studied. The kinetic par...
-
Article
Distribution of HDBP in two-phase systems consisting of aqueous nitric acid, organic diluent (with or without TBP), and HDBP or its zirconium salt
The distribution of HDBP between 0–5 M aqueous HNO3 and various solvents or solutions of acidic zirconium salt of HDBP (HDBP ZS, HDBP : Zr ratio 6–18) in the same solvents [decane, xylene, CCl4, m-nitrobenzotrifl...
-
Article
Simulation of the distribution of radionuclides in the reservoir bed for deep-well injection disposal of acid liquid radioactive waste
A mathematical model was developed for describing the changes in the state of the reservoir bed for dee-well injection disposal of acid liquid radioactive waste. The model considers the multicomponent filtrati...
-
Article
Radiolysis Products of Nitrate-Acetate Aqueous Solutions and Their Influence on pH of the Solutions
The influence of the components of nitrate-acetate aqueous solution and products of their radiolysis on pH of the solutions was experimentally studied in a wide dose range. The results can be used to estimate ...
-
Article
Radiation stability of regenerated strip** solutions for high-level waste processing
The radiation stability of UNEX strip** solutions containing water, methylamine carbonate, nitrilotriacetic acid, and metal salts was experimentally studied. The decomposition of the methylamine carbonate an...
-
Article
Mathematical Simulation of the Behavior of Spent Organic Extracting Agent in the Near-Well Region in the Case of Deep Burial
A mathematical model of the physicochemical processes occurring in a reservoir bed with simultaneous disposal of organic and aqueous radioactive wastes in deep-lying porous geological formations is presented. ...
-
Article
Radiation Chemical Behavior of Tributyl Phosphate, Dibutylphosphoric Acid, and Its Zirconium Salt in Organic Solutions and Two-Phase Systems
Radiation-induced and hydrolytic decomposition of HDBP and its zirconium salt in organic solutions and two-phase aqueous-organic systems in the presence of TBP and nitric acid is studied. The yields of radiati...
-
Article
Thermochemical Oxidation of Components of Extraction Solutions and Boundary Conditions of Thermal Explosion: 6. Thermal Stability of Two-Phase Systems TBP-HNO3 and TBP-Dodecane-HNO3 in Sealed Vessels
Thermochemical degradation of two-phase systems TBP-HNO3 and 30% TBP in dodecane-HNO3 (HNO3 concentration 1.5-10 M) on heating in a sealed vessel to 130-170°C is studied. Heating to 130-150°C promotes exothermic ...
-
Article
Radiation-Chemical Resistance of Anion Exchangers and Safety of Sorption Processes in Nitric Acid Media: V. Thermochemical Degradation Dynamics of VP-1AP Anion Exchanger
Thermal degradation of VP-1AP anion exchanger and its mixtures with HNO3 was studied in open vessels at 40 to 260°C. The anion exchanger ignites only after drying and heating to 220-260°C. Heating VP-1AP mixtures...
-
Article
Thermochemical Oxidation of Extraction System Components and the Boundary Parameters of a Thermal Explosion: 5. Gas Evolution in Thermolysis of Two-Phase Systems in Open Vessels
Gas evolution dynamics in thermal oxidation of TBP and its dodecane solutions as part of two-phase systems containing HNO3 were studied in open vessels at different temperatures (75-110°C) and acid concentrations...
-
Article
Radiation–Thermal Decomposition of Nitric and Acetic Acids in a Aqueous Nitrate Solution
The kinetics of radiation, thermal, and radiation–thermal decomposition of a mixture of nitric and acetic acids in water solutions of sodium nitrate is investigated under homogeneous conditions and with a soli...
-
Article
Regeneration of Spent TBP-Diluent Solvent by Steam Distillation
Regeneration of irradiated and actual spent solvent (30% TBP in a hydrocarbon diluent) by overheated steam distillation was studied in batch experiments. The hydrodynamic and extraction-backwash parameters of ...
-
Article
Radiation-Chemical Resistance of Anion Exchangers and Safety of Sorption Processes in Nitric Acid Solutions: IV. Thermal Gravimetric Study of VP-1AP Anion Exchanger in Nitrate Form
Thermal gravimetric analysis of the samples of VP-1AP anion exchanger in sulfate and nitrate forms was carried out. In the derivatograms of the anion exchanger in the nitrate form there are one endothermic and...
-
Article
Radiation-Chemical Behavior of TBP in Hydrocarbon and Chlorohydrocarbon Diluents under Conditions of Reprocessing of Spent Fuel from Nuclear Power Plants
Experiments were performed for comparative assessment of the effect of ionizing radiation on the service characteristics of 30% TBP solutions in various diluents: hexachlorobutadiene (HCBD), mixtures of n-paraffi...
-
Article
Radiation-Chemical Resistance of Anion Exchangers and Safety of Sorption Processes in Nitric Acid Solutions: III. Radiation-Chemical Resistance of VP-1AP Anion Exchanger
Variation of physicochemical characteristics of VP-1AP anion-exchange resin in HNO3 solutions on heating and under the action of external γ-radiation up to the absorbed dose of 5 MGy was studied. It was shown tha...
-
Article
Thermochemical Oxidation of Components of Extraction Solutions and Threshold Conditions of Thermal Explosion: 4. Kinetics of Reaction of TBP Solutions in Dodecane with Nitric Acid
The reaction of 30% solutions of TBP in dodecane with HNO3 at the initial concentration of the acid of 1.4 M was studied in the temperature range 75-150°C. The kinetic parameters of acid consumption, gas evolutio...
-
Article
Simulation of Radiation-Chemical Decomposition of Organic Impurities in Liquid Radioactive Wastes at Depth Disposal
A mathematical model is developed to describe the behavior of organic impurities in liquid radioactive wastes at depth geological disposal. The model includes description of the migration of radionuclides and ...
-
Article
Radiation Stability of Dibenzo-21-Crown-7 Used for Solvent Extraction of Cesium-137
Crown ether Dibenzo-21-crown-7 (DB-7) has demonstrated a high capability for removing cesium-137 both from acidic and alkaline solution. However, there is a very important problem concerning changes in physica...
