Abstract
The extraction of microamounts of U(VI), Th(IV), and rare earth elements(III) [REE(III)] from HNO3 solutions with solutions of 4,4-bis(diphenylphosphoryl)butan-2-one in dichloroethane was studied. The stoichiometry of the extractable complexes was determined, and the influence of the extractant structure, kind of organic diluent, and aqueous phase composition on the efficiency and selectivity of the extraction of U(VI), Th(IV), and REE(III) into the organic phase was studied. The presence of the CH3C(O)CH2 substituent in the methylene bridge of the tetraphenylmethylenediphosphine dioxide molecule enhances the extraction of heavy REE(III) from neutral nitrate solutions, but decreases the ability of 4,4-bis(diphenylphosphoryl)butan-2-one to extract Th(IV) and REE(III) from nitric acid solutions, with an increase in the U/Th and U/REE separation factors.
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