Vapor-liquid equilibria for nitric acid-water and plutonium nitrate-nitric acid-water solutions
The liquid-vapor equilibrium data for nitric acid and nitric acid-plutnonium nitrate-water solutions were examined to develop correlations covering the range of conditions encountered in nuclear fuel reprocessing. The scanty available data for plutonium nitrate solutions are of poor quality but allow an order of magnitude estimate to be made. A formal thermodynamic analysis was attempted initially but was not successful due to the poor quality of the data as well as the complex chemical equilibria involved in the nitric acid and in the plutonium nitrate solutions. Thus, while there was no difficulty in correlating activity coefficients for nitric acid solutions over relatively narrow temperature ranges, attempts to extend the correlations over the range 25/sup 0/C to the boiling point were not successful. The available data were then analyzed using empirical correlations from which normal boiling points and relative volatilities can be obtained over the concentration ranges 0 to 700 g/l Pu, 0 to 13 M nitric acid. Activity coefficients are required, however, if estimates of individual component vapor pressures are needed. The required ternary activity coefficients can be approximated from the correlations.
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- Resource Type:
- Technical Report
- Research Org:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- Country of Publication:
- United States
- 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; NITRIC ACID; EQUILIBRIUM; VOLATILITY; PLUTONIUM NITRATES; AQUEOUS SOLUTIONS; EVAPORATION; LIQUIDS; MEDIUM TEMPERATURE; VAPORS; WATER; ACTINIDE COMPOUNDS; DISPERSIONS; FLUIDS; GASES; HYDROGEN COMPOUNDS; INORGANIC ACIDS; MIXTURES; NITRATES; NITROGEN COMPOUNDS; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PLUTONIUM COMPOUNDS; SOLUTIONS; TRANSURANIUM COMPOUNDS 400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials; 050800 -- Nuclear Fuels-- Spent Fuels Reprocessing; 055001 -- Nuclear Fuels-- Safeguards, Inspection, & Accountability-- Technical Aspects
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