| abstract |
The process comprises a first stage (A) of contacting the degraded solvent with a first aqueous solution containing an organic sequestrant constituted by alpha -hydroxycarboxylic acid or alpha -ketocarboxylic acid, e.g. mesoxalic acid, for extracting the radioactive metallic impurities, then a second stage (C) of contacting the solvent with a second solution comprising a basic reagent, e.g. tetramethyl ammonium hvdroxide, in order to extract acid organic molecules resulting from the degradation of the solvent. Thus, two separate effluents are collected (in 7 and 19), whereof only one (7) is radioactive. <IMAGE> |