Extraction of Am(III) and Eu(III) nitrates by 2,6-di-(5,6-dipropyl-1,2,4-triazin-3-yl)pyridines
The extraction of Am(III) and Eu(III) by 2,6-di(5,6-dipropyl-1,2,4-triazin-3-yl)-pyridines from mostly 1.9M (HNO{sub 3} + NH{sub 4}NO{sub 3}) was studied. The compound with n-propyl (DPTP) forms dimers and trimers in mixed branched alkanes modified with 2-ethyl-1-hexanol. The self-association is supported by enhancing the NHO{sub 3} concentration from 0.3 to 0.9 M. In the above modified diluent, DPTP extracts Am(III) and Eu(III) nitrates as the complexes Am(NO{sub 3}){sub 3}{center{underscore}dot}HNO{sub 3}{center{underscore}dot}3B and Eu(NO{sub 3}){sub 3}{center{underscore}dot}HNO{sub 3}{center{underscore}dot}3B. The Am(III)/Eu(III) separation factor is typically 100--120. The extraction and separation efficiency of DPTP strongly decreases in the order of diluents (each modified with 2-ethyl-1-hexanol) branched alkanes > cyclohexane > 2-methyl-4-pentanone > 2-ethylhexyl acetate > benzene > chlorobenzene > xylene. 1-Octanol and 2-ethyl-1-hexanol modifiers support appropriately the solubility of protonated forms of DPTP in branched alkanes, and moderately enhance the extraction of Am(III) and Eu(III). 1-Butanol modifier allows a higher extraction efficiency but supports less the solubility. The optimum extraction and separation efficiency is attained at 10--20 vol% modifier. The isopropyl analogue extracts Am(III) more effectively than DPTP, but the extraction is slow and the separation from Eu(III) is inefficient.
- Research Organization:
- Forschungszentrum Karlsruhe (DE)
- OSTI ID:
- 20000553
- Journal Information:
- Solvent Extraction and Ion Exchange, Vol. 17, Issue 5; Other Information: PBD: Sep 1999; ISSN 0736-6299
- Country of Publication:
- United States
- Language:
- English
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