Abstract
‘Red oil’ materials, resembling those produced during destructive incidents at Hanford and Savannah River, have been prepared following prolonged heating of uranyl nitrate, nitric acid, tributylphosphate (TBP) and a hydrocarbon diluent either under reflux conditions or within a high-pressure bomb reactor. Phase inversions, a characteristic feature of ‘red oil’ formation, were observed only when a cyclic hydrocarbon diluent was employed and were not observed when a straight chain hydrocarbon was used. The energetic content of the ‘red oil’ materials was found to be in the range from 30 to 444 J g−1 (7.2–106.1 cal g−1) as determined by DSC in open pans in the temperature range 20–350°C, with a typical value being 200 J g−1 (47.8 cal g−1). A ‘baseline’ Purex solution of UO2(NO3)2(TBP)2 released 120 J g−1 (28.7 cal g−1) upon heating through the same temperature range.
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