THE UNIVERSAL SOLVENT EXTRACTION (UNEX) PROCESS. II. FLOWSHEET DEVELOPMENT AND DEMONSTRATION OF THE UNEX PROCESS FOR THE SEPARATION OF CESIUM, STRONTIUM, AND ACTINIDES FROM ACTUAL ACIDIC RADIOACTIVE WASTE

2001 ◽  
Vol 19 (1) ◽  
pp. 23-36 ◽  
Author(s):  
Jack D. Law ◽  
R. Scott Herbst ◽  
Terry A. Todd ◽  
Valeriy N. Romanovskiy ◽  
Vasily A. Babain ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Radioactive Waste ◽  
Unex Process ◽  
Flowsheet Development

THE UNIVERSAL SOLVENT EXTRACTION (UNEX) PROCESS. I. DEVELOPMENT OF THE UNEX PROCESS SOLVENT FOR THE SEPARATION OF CESIUM, STRONTIUM, AND THE ACTINIDES FROM ACIDIC RADIOACTIVE WASTE

2001 ◽  
Vol 19 (1) ◽  
pp. 1-21 ◽  
Author(s):  
Valeriy N. Romanovskiy ◽  
Igor V. Smirnov ◽  
Vasily A. Babain ◽  
Terry A. Todd ◽  
R. Scott Herbst ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Radioactive Waste ◽  
Unex Process

scholarly journals Neptunium extraction by N,N-dialkylamides

2020 ◽  
Vol 108 (9) ◽  
pp. 707-716
Author(s):  
Jarrod M. Gogolski ◽  
Peter R. Zalupski ◽  
Travis S. Grimes ◽  
Mark P. Jensen
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Radioactive Waste ◽  
Partial Oxidation ◽  
Acid Solutions ◽  
Nitric Acid Solutions ◽  
Organic Solutions

AbstractSeparation of neptunium by solvent extraction has been based on tributylphosphate (TBP) for decades, but TBP is not fully incinerable, which adds to the burden of long-lived radioactive waste. Alternatives to TBP for uranium and plutonium extraction, such as the N,N-diakylamides, previously have been explored in the hopes of transitioning to an extractant that is incinerable. Four N,N-diakylamides, N,N-dihexylhexanamide (DHHA), N,N-dihexyloctanamide (DHOA), N,N-di(2-ethylhexyl)butanamide (DEHBA), and N,N-di(2-ethylhexyl)-iso-butanamide (DEHiBA) were considered in this work for their potential to extract millimolar concentrations of Np(IV), Np(V), and Np(VI) from nitric acid solutions into organic solutions containing 1 M extractant in Exxsol D60. Under these conditions the branching of the alkyl substituents affects the extractability of Np(VI) and Np(IV), causing three of the dialkylamides, DHHA, DHOA and DEHBA, to extract neptunium in the expected order Np(VI) > Np(IV) > > Np(V). In contrast, branched DEHiBA is so poor an extractant for Np(IV) that the extraction order becomes Np(VI) > > Np(V) > Np(IV) between 0.1 and 5.6 M HNO3 due to partial oxidation of the Np(V) in nitric acid.

Development of a Regenerable Strip Reagent for Treatment of Acidic, Radioactive Waste with Cobalt Dicarbollide‐based Solvent Extraction Processes

2005 ◽  
Vol 23 (1) ◽  
pp. 59-83 ◽  
Author(s):  
Jack D. Law ◽  
R. Scott Herbst ◽  
Dean R. Peterman ◽  
Terry A. Todd ◽  
Valeriy N. Romanovskiy ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Radioactive Waste ◽  
Extraction Processes

scholarly journals Cesium Removal from Savannah River Site Radioactive Waste using the Caustic-Side Solvent Extraction (CSSX) Process

2005 ◽  
Vol 40 (1-3) ◽  
pp. 297-309 ◽  
Author(s):  
D. D. Walker ◽  
M. A. Norato ◽  
S. G. Campbell ◽  
M. L. Crowder ◽  
S. D. Fink ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Radioactive Waste ◽  
Savannah River Site ◽  
Savannah River ◽  
Cesium Removal ◽  
River Site
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