期刊
SOLVENT EXTRACTION AND ION EXCHANGE
卷 30, 期 5, 页码 433-444出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/07366299.2012.671111
关键词
i-SANEX; liquid-liquid extraction; aqueous complexation; hydrophilic BTP; actinides(III); lanthanides(III); separation; nitric acid
资金
- Commission of the European Community [FP7-CP-2007-211 267]
- German Federal Ministry of Education and Research (BMBF) [02NUK012A, 02NUK012E]
i-SANEX is a process for separating actinides(III) from used nuclear fuels by solvent extraction: Actinides(III) and lanthanides(III) are co-extracted from a PUREX raffinate followed by selective back extraction of actinides(III) from the loaded organic phase. This step requires a complexing agent selective for actinides(III). A hydrophilic sulfonated bis triazinyl pyridine (SO3-Ph-BTP) was synthesized and tested for selective complexation of actinides(III) in nitric acid solution. When co-extracting Am(III) and Eu(III) from nitric acid into TODGA, adding SO3-Ph-BTP to the aqueous phase suppresses Am(III) extraction while Eu(III) is extracted. Separation factors in the range of 1000 are achieved. SO3-PhBTP remains active in nitric acid up to 2 mol/L. As a result of this performance, buffering or salting-out agents are not needed in the aqueous phase; nitric acid is used to keep the lanthanides(III) in the TODGA solvent. These properties make SO3-Ph-BTP a suitable candidate for i-SANEX process development.
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