Abstract
The possibility of changing the aggregate state of several solid mono- and bidentate neutral organophosphorus compounds in contact with various mineral acids was demonstrated. The formation of the liquid phase immiscible with water was observed. The, phase exhibits a high extraction capability with respect to actinides in various oxidation states. The diphenyl(dibutylcarbamoylmethyl)phosphine oxide-NHO3 extraction system was studied in detail. The composition of the liquid phase was shown to the Ph2P(O)CH2C(O)NBu2·HNO3·nH2O (n=2 or 3). The kinetics of formation of this phase and extraction of Amiii from solutions of nitric acid and its salts was studied. The organic phase exhibits redox properties, due to which some actinides change the oxidation state during extraction. The “aryl strengthening effect” was suggested to exist for extraction of AmIII in the absence of a solvent.
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