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- Title
Extraction of uranyl nitrate with a binary extractant based on di(2,4,4-trimethylpentyl)phosphinic acid.
- Authors
Egorova, N. S.; Belova, V. V.; Voshkin, A. A.; Khol’kin, A. I.; Pyartman, A. K.; Keskinov, V. A.
- Abstract
The extraction of uranyl nitrate with methyltrioctylammomium di(2,4,4-trimethylpentyl)phosphinate is compared to uranyl nitrate extraction with constituent cation-and anion-exchange extracting agents at various compositions of aqueous and organic phases. In UO2(NO3)2 extraction with quaternary ammonium nitrate and dialkylphosphinic acid solutions in toluene, the compounds (R4N)2UO2(NO3)4 and UO2A2, respectively, are formed in the organic phase. The binary extraction of uranyl nitrate is characterized by larger distribution ratios than extraction with the initial quaternary ammonium nitrate. Under saturation conditions, the capacity of the binary extractant is two times higher than the capacity of the anion-exchange extractant at the same concentration. Uranyl nitrate extraction with a binary extractant can yield, in the organic phase, complexes in which the uranyl ion either forms a salt with the anion of the organic acid or is incorporated into an extractable complex anion, depending on its thermodynamic stability in the heterogeneous system.
- Subjects
EXTRACTION (Chemistry); NITRATES; AMMONIUM nitrate; TOLUENE; CHEMICAL engineering
- Publication
Theoretical Foundations of Chemical Engineering, 2008, Vol 42, Issue 5, p708
- ISSN
0040-5795
- Publication type
Article
- DOI
10.1134/S0040579508050394