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Solvent Extraction and Ion Exchange Volume 17, 1999 - Issue 5
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Original Articles

EXTRACTION OF Am(lll) AND Eu(lll) NITRATES BY 2-6-DI-(5,6-DIPROPYL-1,2,4-TRIAZIN-3-YL)PYRIDINES 1

Zdenek Kolarik (ret.) Institut für Nukleare Entsorgungstechnik, Forschungszentrum Karlsruhe, P. O. Box 3640, Karlsruhe, 76021, Germany
,
Udo Mullich Institut für Nukleare Entsorgungstechnik, Forschungszentrum Karlsruhe, P. O. Box 3640, Karlsruhe, 76021, Germany
&
Franz Gassner Institut für Technische Chemie, Forschungszentrum Karlsruhe, P. O. Box 3640, Karlsruhe, 76021, Germany
Pages 1155-1170 | Received 21 Aug 1998, Published online: 22 Jun 2010
 
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ABSTRACT

The extraction of Am(lll) and Eu(lll) by 2,6-di(5,6-dipropyl-1,2,4-triazin-3-yl)-pyridines from mostly 1·9 M (HNO3 + NH4NO3) 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 HNO3 concentration from 0·3 to 0·9 M. In the above modified diluent, DPTP extracts Am(lll) and Eu(lll) nitrates as the complexes Am(NO3)3HNO3-3B and Eu(NO3)3HN033B. The Am(lll)/Eu(lll) 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(lll) and Eu(lll). 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(lll) more effectively than DPTP, but the extraction is slow and the separation from Eu(lll) is inefficient.

Notes

Work performed within the European Commission's research programme on nuclear fission safety, shared cost action, contract No. FI4I-CT96-0010.

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