A Thermodynamic Model of Nitric Acid Extraction by Tri-n-Butyl Phosphate
- 1 July 1988
- journal article
- research article
- Published by Taylor & Francis in Nuclear Technology
- Vol. 82 (1) , 52-59
- https://doi.org/10.13182/nt88-a34116
Abstract
A thermodynamic model is presented for nitric acid extraction by tri-n-butyl phosphate (TBP). This model is based on the formation of the organic phase species: TBP · HNO3 and (TBP)2 · HNO3. The model works successfully at TBP concentrations of 5 to 100 vol% and was found to be effective at predicting the extraction of HNO3 from HNO3/NaNO3 and HNO3/LiNO3 solutions. Within the TBP concentration range of 5 to 30%, a single set of extraction constants was sufficient to fit extraction data. Stoichiometric activity coefficients of nitric acid in HNO3/NaNO3 and HNO3/LiNO3 mixtures were calculated using a model developed by Bromley.Keywords
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