Effects of radiation, acid, and base on the extractant dihexyl-(diethylcarbamoyl)methyl) phosphonate
The effects of exposure to gamma radiation (/sup 60/Co) and of contact with acidic and basic aqueous solutions on dihexyl((diethylcarbamoyl)methyl)phosphonate (DHDECMP) were studied. Gamma radiation decomposes DHDECMP into a variety of products. The most troublesome of those are the acidic compounds that cause problems in stripping the actinides and lanthanides from the extractant at low acid concentrations. The rate of degradation of DHDECMP by radiation is about the same or only slightly higher than that of tri-n-butyl phosphate (TBP). It is relatively easy to remove the radiation-produced impurities by equilibration (scrubbing) with sodium carbonate or sodium hydroxide or by column chromatographic methods. The hydrolysis of DHDECMP in contact with aqueous solutions containing less than 3 M HNO/sub 3/ is not more severe than that of TBP under the same conditions but is significant above that acid concentration. Hydrolysis of DHDECMP in contact with aqueous sodium hydroxide solution does occur, but it should not pose an important problem with the short contact times such as those anticipated for the removal of the radiation-induced degradation products by caustic scrubbing. Results of various chromatographic tests to characterize the degradation products of DHDECMP are also given.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5827606
- Report Number(s):
- ORNL/TM-7494; ON: DE82004669; TRN: 82-004745
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
DHDECMP
HYDROLYSIS
RADIOLYSIS
CHEMICAL RADIATION EFFECTS
CHROMATOGRAPHY
GAMMA RADIATION
NITRIC ACID
SCRUBBING
SODIUM CARBONATES
SODIUM HYDROXIDES
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ESTERS
HYDROGEN COMPOUNDS
HYDROXIDES
INORGANIC ACIDS
IONIZING RADIATIONS
LYSIS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHONIC ACID ESTERS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
SEPARATION PROCESSES
SODIUM COMPOUNDS
SOLVOLYSIS
050800* - Nuclear Fuels- Spent Fuels Reprocessing
400600 - Radiation Chemistry