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Title: An Advanced TALSPEAK Concept Using 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester as the Extractant

Abstract

A method for separating the trivalent actinides and lanthanides is being developed using 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (HEH[EHP]) as the extractant. The method is based on the preferential binding of the actinides in the aqueous phase by N-(2-hydroxyethyl)ethylenediamine-N,N',N'-triacetic acid (HEDTA), which serves to keep the actinides in the aqueous phase while the lanthanides are extracted into an organic phase containing HEH[EHP]. The process is very robust, showing little dependence upon the pH or the HEH[EHP], HEDTA, and citrate concentrations over the ranges that might be expected in a nuclear fuel recycling plant. Single-stage runs with a 2-cm centrifugal contactor indicate that modifications to the process chemistry may be needed to increase the extraction rate for Sm, Eu, and Gd. The hydraulic properties of the system are favorable to application in centrifugal contactors.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1188888
Report Number(s):
PNNL-SA-104552
AF5805010
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Solvent Extraction and Ion Exchange, 33(3):211-223
Additional Journal Information:
Journal Name: Solvent Extraction and Ion Exchange, 33(3):211-223
Country of Publication:
United States
Language:
English
Subject:
lanthanide separation; actinide separation; TALSPEAK; HEH[EHP]

Citation Formats

Lumetta, Gregg J., Casella, Amanda J., Rapko, Brian M., Levitskaia, Tatiana G., Pence, Natasha K., Carter, Jennifer C., Niver, Cynthia M., and Smoot, Margaret R. An Advanced TALSPEAK Concept Using 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester as the Extractant. United States: N. p., 2014. Web. doi:10.1080/07366299.2014.985920.
Lumetta, Gregg J., Casella, Amanda J., Rapko, Brian M., Levitskaia, Tatiana G., Pence, Natasha K., Carter, Jennifer C., Niver, Cynthia M., & Smoot, Margaret R. An Advanced TALSPEAK Concept Using 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester as the Extractant. United States. https://doi.org/10.1080/07366299.2014.985920
Lumetta, Gregg J., Casella, Amanda J., Rapko, Brian M., Levitskaia, Tatiana G., Pence, Natasha K., Carter, Jennifer C., Niver, Cynthia M., and Smoot, Margaret R. 2014. "An Advanced TALSPEAK Concept Using 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester as the Extractant". United States. https://doi.org/10.1080/07366299.2014.985920.
@article{osti_1188888,
title = {An Advanced TALSPEAK Concept Using 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester as the Extractant},
author = {Lumetta, Gregg J. and Casella, Amanda J. and Rapko, Brian M. and Levitskaia, Tatiana G. and Pence, Natasha K. and Carter, Jennifer C. and Niver, Cynthia M. and Smoot, Margaret R.},
abstractNote = {A method for separating the trivalent actinides and lanthanides is being developed using 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (HEH[EHP]) as the extractant. The method is based on the preferential binding of the actinides in the aqueous phase by N-(2-hydroxyethyl)ethylenediamine-N,N',N'-triacetic acid (HEDTA), which serves to keep the actinides in the aqueous phase while the lanthanides are extracted into an organic phase containing HEH[EHP]. The process is very robust, showing little dependence upon the pH or the HEH[EHP], HEDTA, and citrate concentrations over the ranges that might be expected in a nuclear fuel recycling plant. Single-stage runs with a 2-cm centrifugal contactor indicate that modifications to the process chemistry may be needed to increase the extraction rate for Sm, Eu, and Gd. The hydraulic properties of the system are favorable to application in centrifugal contactors.},
doi = {10.1080/07366299.2014.985920},
url = {https://www.osti.gov/biblio/1188888}, journal = {Solvent Extraction and Ion Exchange, 33(3):211-223},
number = ,
volume = ,
place = {United States},
year = {Sun Dec 21 00:00:00 EST 2014},
month = {Sun Dec 21 00:00:00 EST 2014}
}