Spent solvent waste arising in TOKAI REPROCESSING PLANT (TRP), has been separated dodecane and TBP by the phosphoric acid extraction process, then the dodecane has been purified for re-using, and TBP waste has been solidified with plastic epoxy or pvc. In this paper, operation experience of dodecane purification is reported mainly in solvent waste treatment. It was cleared that there were various organic iodine species in recovery dodecane separated by the phosphoric acid extraction process, and it was confirmed that the purification process of silica gel-AgX-MS13X series was effective.

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