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

Abstract

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.

Authors:
 [1];  [2];  [3];  [4];  [5]; ORCiD logo [2];  [2]
  1. Nuclear Chemistry and Engineering Group, Pacific Northwest National Laboratory, Richland, WA, USA; School of Nuclear Science and Engineering, Oregon State University, Corvallis, OR, USA
  2. Nuclear Chemistry and Engineering Group, Pacific Northwest National Laboratory, Richland, WA, USA
  3. Aqueous Separations and Radiochemistry Department, Idaho National Laboratory, Idaho Falls, ID, USA
  4. 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
  5. School of Nuclear Science and Engineering, Oregon State University, Corvallis, OR, USA
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1430434
Report Number(s):
PNNL-SA-128488
Journal ID: ISSN 0736-6299; 49627; AF5805010
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Solvent Extraction and Ion Exchange; Journal Volume: 36; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
ALSEP; actinide separations; HEH[EHP]; purification; Environmental Molecular Sciences Laboratory

Citation Formats

Holfeltz, Vanessa E., Campbell, Emily L., Peterman, Dean R., Standaert, Robert F., Paulenova, Alena, Lumetta, Gregg J., and Levitskaia, Tatiana G. Effect of HEH[EHP] impurities on the ALSEP solvent extraction process. United States: N. p., 2017. Web. doi:10.1080/07366299.2017.1412111.
Holfeltz, Vanessa E., Campbell, Emily L., Peterman, Dean R., Standaert, Robert F., Paulenova, Alena, Lumetta, Gregg J., & Levitskaia, Tatiana G. Effect of HEH[EHP] impurities on the ALSEP solvent extraction process. United States. doi:10.1080/07366299.2017.1412111.
Holfeltz, Vanessa E., Campbell, Emily L., Peterman, Dean R., Standaert, Robert F., Paulenova, Alena, Lumetta, Gregg J., and Levitskaia, Tatiana G. Wed . "Effect of HEH[EHP] impurities on the ALSEP solvent extraction process". United States. doi:10.1080/07366299.2017.1412111.
@article{osti_1430434,
title = {Effect of HEH[EHP] impurities on the ALSEP solvent extraction process},
author = {Holfeltz, Vanessa E. and Campbell, Emily L. and Peterman, Dean R. and Standaert, Robert F. and Paulenova, Alena and Lumetta, Gregg J. and Levitskaia, Tatiana G.},
abstractNote = {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.},
doi = {10.1080/07366299.2017.1412111},
journal = {Solvent Extraction and Ion Exchange},
number = 1,
volume = 36,
place = {United States},
year = {Wed Dec 20 00:00:00 EST 2017},
month = {Wed Dec 20 00:00:00 EST 2017}
}