Effect of HEH[EHP] impurities on the ALSEP solvent extraction process

Holfeltz, Vanessa E.; Campbell, Emily L.; Peterman, Dean R.; Standaert, Robert F.; Paulenova, Alena; Lumetta, Gregg J.; Levitskaia, Tatiana G.

doi:10.1080/07366299.2017.1412111

Effect of HEH[EHP] impurities on the ALSEP solvent extraction process

Journal Article · 20 December 2017 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299.2017.1412111· OSTI ID:1430434

Holfeltz, Vanessa E. ^[1]; Campbell, Emily L. ^[2]; Peterman, Dean R. ^[3]; Standaert, Robert F. ^[4]; Paulenova, Alena ^[5]; ^[2]; Levitskaia, Tatiana G. ^[2]

Nuclear Chemistry and Engineering Group, Pacific Northwest National Laboratory, Richland, WA, USA; School of Nuclear Science and Engineering, Oregon State University, Corvallis, OR, USA
Nuclear Chemistry and Engineering Group, Pacific Northwest National Laboratory, Richland, WA, USA
Aqueous Separations and Radiochemistry Department, Idaho National Laboratory, Idaho Falls, ID, USA
Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA; Department of Biochemistry &, Cellular and Molecular Biology, University of Tennessee, Knoxville, TN, USA; Biology &, Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA; Shull Wollan Center — a Joint Institute for Neutron Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA
School of Nuclear Science and Engineering, Oregon State University, Corvallis, OR, USA

In solvent extraction processes, organic phase impurities can negatively impact separation factors, hydrolytic performance, and overall system robustness. This affects the process-level viability of a separation concept and necessitates knowledge of the behavior and mechanisms to control impurities in the solvent. The most widespread way through which impurities are introduced into a system is through impure extractants and/or diluents used to prepare the solvent, and often development of new purification schemes to achieve the desired level of purity is needed. In this work, the acidic extractant, 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (HEH[EHP])—proposed for application in extractive processes aimed at separating trivalent minor actinides from lanthanides and other fission products—is characterized with respect to its common impurities and their impact on Am(III) stripping in the Actinide Lanthanide SEParation (ALSEP) system. To control impurities in HEH[EHP], existing purification technologies commonly applied for the acidic organophosphorus reagents are reviewed, and a new method specific to HEH[EHP] purification is presented.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1430434

Report Number(s):: PNNL-SA-128488; 49627; AF5805010

Journal Information:: Solvent Extraction and Ion Exchange, Vol. 36, Issue 1; ISSN 0736-6299

Publisher:: Taylor and Francis

Country of Publication:: United States

Language:: English

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Evaluation of the impacts of gamma radiolysis on an ALSEP process solvent Peterman, Dean R.; Zarzana, Christopher A.; Tillotson, Richard D. Journal of Radioanalytical and Nuclear Chemistry, Vol. 316, Issue 2 https://doi.org/10.1007/s10967-018-5737-0	journal	February 2018
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Minimizing the aggregation of diglycolamide reverse micelles in the n -dodecane phase with bis-(2-ethylhexyl)phosphoric acid “reactive” phase modifier Swami, K. Rama; Kumaresan, R.; Venkatesan, K. A. New Journal of Chemistry, Vol. 42, Issue 11 https://doi.org/10.1039/c8nj01074a	journal	January 2018

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Related Subjects

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actinide separations
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Environmental Molecular Sciences Laboratory

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