Combining CMPO and HEH[EHP] for Separating Trivalent Lanthanides from the Transuranic Elements

Journal Article · Thu Sep 05 04:00:00 EDT 2013 · Solvent Extraction and Ion Exchange, 31(6):567-577

DOI:https://doi.org/10.1080/07366299.2013.785912· OSTI ID:1092636

Braley, Jenifer C.; Lumetta, Gregg J.; Carter, Jennifer C.

Combining octyl(phenyl)-N,N-diisobutyl-carbamoylmethylphosphine oxide (CMPO) and 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (HEH[EHP]) into a single process solvent for separating transuranic elements from liquid high-level waste is explored. The lanthanides and americium can be co-extracted from HNO3 into 0.2 mol/L CMPO + 1.0 mol/L HEH[EHP] in n-dodecane. The extraction is relatively insensitive to the HNO3 concentration within 0.1 to 5 mol/L HNO3. Americium can be selectively stripped from the CMPO/HEH[EHP] solvent into a citrate-buffered N-(2-hydroxyethyl)ethylenediaminetriacetic acid solution . Separation factors >14 can be achieved in the range pH 2.5 to 3.7, and the separation factors are relatively insensitive to pH, a major advantage of this solvent formulation.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1092636
• Report Number(s): PNNL-SA-91890; AF5805000
• Journal Information: Solvent Extraction and Ion Exchange, 31(6):567-577, Journal Name: Solvent Extraction and Ion Exchange, 31(6):567-577
• Country of Publication: United States
• Language: English

Related Subjects

CMPO
HEH[EHP]
actinide separation
lanthanide separation