Empirical Modeling of U(IV) Distribution in a Nitric Acid-Water-30% TBP/<i>n</i>-Dodecane Biphasic System in the Presence of U(VI), Pu(III), and Hydrazine Nitrate

Shekhar Kumar; Sudhir B. Koganti

doi:dx.doi.org/10.13182/NT98-A2885

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Empirical Modeling of U(IV) Distribution in a Nitric Acid-Water-30% TBP/n-Dodecane Biphasic System in the Presence of U(VI), Pu(III), and Hydrazine Nitrate

Shekhar Kumar, Sudhir B. Koganti

Nuclear Technology / Volume 123 / Number 1 / July 1998 / Pages 116-119

Technical Note / Radioactive Waste Management and Disposal / dx.doi.org/10.13182/NT98-A2885

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In current salt-free flow sheets, U(IV) is used as a reductant in reductive partitioning of U-Pu. Because U(IV)-tri-n-butylphosphate (TBP) solvate has a low solubility in the organic phase, quantitative knowledge of U(IV) distribution behavior is important. Published data on U(IV) distribution between an aqueous nitric acid and 30% TBP/n-dodecane biphasic system at 298.15 K is analyzed, and an empirical model is reported. Performance of this model is compared with one earlier published model.