Modeling of the simultaneous extraction of nitric acid and uranyl nitrate with tri-n-butyl phosphate. Application to extraction operation

Journal Article · Fri Jan 01 04:00:00 EST 1999 · Separation Science and Technology

DOI:https://doi.org/10.1081/SS-100100640· OSTI ID:323989

Comor, J J; Tolic, A S; Kopecni, M M; Petkovic, D M ^[1]

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1. Vinca Inst. of Nuclear Sciences, Belgrade (Yugoslavia). Chemical Dynamics Lab.

A mathematical model developed for the equilibrium HNO{sub 3}-UO{sub 2}(NO{sub 3}){sub 2}-tri-n-butyl phosphate (TBP)-diluent is the basis of the computation of distribution isotherms. The isotherms are used to study the influence of TBP concentration on two chosen operation parameters, distribution coefficients and number of theoretical stages, for the selected flow sheets. It is established that an increase in TBP concentration leads to a decrease in the number of theoretical stages for the extraction flow sheets but to their increase for the striping flow sheets. Given diagrams can be used to determine the efficiency of extraction processes. Agreement with available literature calculations on the number of theoretical stages supports the use of the model in the computation of distribution isotherms, of the system quoted above, in a wide range of nitric acid, uranyl nitrate, and TBP concentrations.

• OSTI ID: 323989
• Journal Information: Separation Science and Technology, Journal Name: Separation Science and Technology Journal Issue: 1 Vol. 34; ISSN 0149-6395; ISSN SSTEDS
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ADSORPTION ISOTHERMS
EFFICIENCY
EQUILIBRIUM
EXTRACTION
MATHEMATICAL MODELS
NITRIC ACID
TBP
URANYL NITRATES