Single-column-based absorption process for treating dissolver off-gas
The fluorocarbon absorption process for krypton and xenon removal from dissolver off-gas is based on exploitation of solubility differences which exist among noble gases and other gas-phase constituents in the fluorocarbon solvent dichlorofluoromethane (refrigerant-12). Process performance and reliability have been demonstrated on an engineering scale with over 10 years of pilot plant operation, including testing with /sup 85/Kr, /sup 133/Xe, and /sup 131/I. The culmination of this work is a single-column design which results in a simplified process with improved reliability and lower cost. Data are presented summarizing recent single-column development activities. These include data plots depicting decontamination factor vs feed gas flow rate, DF vs process absorption factor (kG/L), and location of the concentration peak via the solvent flow rate. In general, 99% removal is easily obtainable for Kr, Xe, and CO/sub 2/ while attaining concentration factors on the order of 10/sup 3/ to 10/sup 4/. Further concentration of the Kr product is investigated using solid sorbent and cold trapping technologies. Effective removal of entrained fluorocarbon solvent and CO/sub 2/ from the single-column product stream is demonstrated using 13X and 5A molecular sieves, respectively. Additional separation of Xe is studied using a silver mordenite bed and compared to existing methods using cryogenic charcoal beds or selective cold trap sublimation. Regardless of the method for Xe removal, Kr is ultimately concentrated via a simple cold trap to > 90% purity from a feed gas containing 10 ppM. 14 figures.
- Research Organization:
- Union Carbide Corp., Oak Ridge, TN (USA). Nuclear Div.
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5365561
- Report Number(s):
- K/PS-5005; CONF-820464-1; ON: DE82017052
- Resource Relation:
- Conference: Workshop on development of dissolver off-gas treatment, Karlsruhe, F.R. Germany, 22 Apr 1982
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
DISSOLVERS
OFF-GAS SYSTEMS
FUEL REPROCESSING PLANTS
KRYPTON
SEPARATION PROCESSES
RADIOACTIVE WASTE PROCESSING
GASEOUS WASTES
XENON
ADSORPTION
CARBON DIOXIDE
HALOGENATED ALIPHATIC HYDROCARBONS
IODINE 131
KRYPTON 85
MOLECULAR SIEVES
PILOT PLANTS
XENON 133
ADSORBENTS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DAYS LIVING RADIOISOTOPES
ELEMENTS
EVEN-ODD NUCLEI
FLUIDS
FUNCTIONAL MODELS
GASES
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IODINE ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KRYPTON ISOTOPES
MANAGEMENT
NONMETALS
NUCLEAR FACILITIES
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PROCESSING
RADIOISOTOPES
RARE GASES
SORPTION
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
XENON ISOTOPES
YEARS LIVING RADIOISOTOPES
050800* - Nuclear Fuels- Spent Fuels Reprocessing
052001 - Nuclear Fuels- Waste Processing