Di(2-Ethylhexyl) Pivalamide (D2EHPVA): A Promising Extractant for Selective Removal of Uranium from High Level Nuclear Waste Solutions

High concentration of uranium present in high-level waste is responsible for third phase formation during actinide partitioning either by TRUEX or DIAMEX process. Di(2-ethylhexyl) pivalamide (D2EHPVA) has been found to be a promising extractant for the selective removal of U over Pu, Np, and Am from...

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Bibliographic Details
Published in:Solvent extraction and ion exchange 2004-12, Vol.22 (3), p.353-375
Main Authors: Manchanda, V. K., Pathak, P. N., Rao, Ashwin K.
Format: Article
Language:English
Subjects:
Di(2-ethylhexyl) pivalamide
Hydrazine nitrate
Hydroxylamine nitrate
Uranium
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Summary:High concentration of uranium present in high-level waste is responsible for third phase formation during actinide partitioning either by TRUEX or DIAMEX process. Di(2-ethylhexyl) pivalamide (D2EHPVA) has been found to be a promising extractant for the selective removal of U over Pu, Np, and Am from simulated PHWR high level waste (SHLW). Role of reducing agents viz. hydroxylamine nitrate (HAN) and hydrazine nitrate (HN) has been evaluated for the adjustment of oxidation states of Pu and Np to inextractable state. Multiple extraction from SHLW containing 0.3 M HAN + 0.8 M HN at 4 M HNO 3 using 1 M D2EHPVA in n-dodecane revealed that ∼98% of U could be extracted in five contacts with
ISSN:0736-6299
1532-2262
DOI:10.1081/SEI-120030396