Effect of Irradiation on Hydrodynamic Properties of Extraction Mixtures Based on Carboxylic Acid Diamides in FS-13 Diluent

The hydrodynamic properties of three promising extraction mixtures, 0.05 M solutions of 2,2′-bi-pyridine-6,6′-dicarboxylic acid di(N-ethyl-4-hexylanilide) (DYP-7), 2,6-pyridinedicarboxylic acid di(N-ethyl-4-fluoroanilide) [Et(pFPh)DPA)], and 2,2′-bipyridine-6,6′-dicarboxylic acid di(N-ethyl-4-ethylanilide) (DYP-9) in trifluoromethyl phenyl sulfone (FS-13), were studied. The density, viscosity, surface tension, and settling rates in the steps of nitric acid extraction, stripping, and regeneration with sodium carbonate solutions were determined for these systems before and after the action of ionizing radiation. The concentrations of the extrac-tants in the irradiated samples were determined, and the radiation-chemical yields of their decomposition were calculated. The density and surface tension increase upon irradiation to a dose of 100 kGy but decrease upon further irradiation.