Effect of Irradiation on the Dynamics of Gas Evolution in Thermal Oxidation of Diamide Extractants in F-3 Diluent

The dynamics of gas evolution in thermal oxidation of solutions of 2,2'-bipyridine-6,6'-dicarboxylic acid di(N-ethyl-4-hexylanilide) (DYP-7), 2,6-pyridinedicarboxylic acid di(N-ethyl-4-fluoroanilide) [Et(pFPh) DPA], and 2,2'-bipyridine-6,6'-dicarboxylic acid di(N-ethyl-4-ethylanilide) (DYP-9) in m-nitrobenzotrifluoride (F-3) diluent with 14 M HNO3 in open and closed vessels was studied. The effect of preliminary irradiation of the organic phase on the kinetics of thermolysis of the two-phase system was determined. Heating of the irradiated samples in a closed vessel (autoclave) leads to the pressure buildup, with the pressure reached increasing from 18 to 23 atm as the absorbed dose is increased from 0 to 1 MGy. The exothermic processes occurring in the systems caused a 4 to 10 degrees C increase in the sample temperature. The thermal stability of all the irradiated diamide-F-3 diluent extraction systems studied is acceptable for practical use.