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Title: Radiation Chemistry of the Hydrophilic DGAs

Abstract

Short chain diglycolamides (DGAs) are water soluble, and have been used as aqueous stripping and hold back agents in both European and American fuel cycle solvent extraction proposals. An understanding of the influence of radiation on these ligands is critical to the development and implementation of robust separation processes. Therefore, the rates of degradation under radiolysis were measured for four hydrophilic DGAs and compared to the organic-soluble DGAs. Water soluble DGAs were degraded at a faster rate than lipophilic DGAs, but were more stable with increasing molecular weight. The degradation products of the tetraethyldiglycolamide (TEDGA) were also identified and found to be analogous to those produced for lipophilic DGAs in irradiated alkanes. It was concluded that similar products are obtained since reactions in both diluents are by oxidation followed rupture of the weak ether linkage. The fast rate constants of the reactions of two hydrophilic DGAs with the oxidizing •OH radical product of water radiolysis are also shown. Since water-soluble DGAs have been proposed for use as stripping or holdback agents in both European and American fuel cycle scenarios this work was performed in collaboration with colleagues at Forschungszentrum Jülich (FZJ).

Authors:
 [1];  [2];  [3]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  2. Forschungszentrum Julich, Julich (Germany)
  3. California State Univ. (CalState), Long Beach, CA (United States)
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1468541
Report Number(s):
INL/EXT-17-43201-Rev000
DOE Contract Number:  
AC07-05ID14517
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; radiation; diglycolamides; free radical chemistry; solvent extraction

Citation Formats

Mincher, Bruce J., Wilden, Andreas, and Mezyk, Stephen P. Radiation Chemistry of the Hydrophilic DGAs. United States: N. p., 2017. Web. doi:10.2172/1468541.
Mincher, Bruce J., Wilden, Andreas, & Mezyk, Stephen P. Radiation Chemistry of the Hydrophilic DGAs. United States. doi:10.2172/1468541.
Mincher, Bruce J., Wilden, Andreas, and Mezyk, Stephen P. Fri . "Radiation Chemistry of the Hydrophilic DGAs". United States. doi:10.2172/1468541. https://www.osti.gov/servlets/purl/1468541.
@article{osti_1468541,
title = {Radiation Chemistry of the Hydrophilic DGAs},
author = {Mincher, Bruce J. and Wilden, Andreas and Mezyk, Stephen P.},
abstractNote = {Short chain diglycolamides (DGAs) are water soluble, and have been used as aqueous stripping and hold back agents in both European and American fuel cycle solvent extraction proposals. An understanding of the influence of radiation on these ligands is critical to the development and implementation of robust separation processes. Therefore, the rates of degradation under radiolysis were measured for four hydrophilic DGAs and compared to the organic-soluble DGAs. Water soluble DGAs were degraded at a faster rate than lipophilic DGAs, but were more stable with increasing molecular weight. The degradation products of the tetraethyldiglycolamide (TEDGA) were also identified and found to be analogous to those produced for lipophilic DGAs in irradiated alkanes. It was concluded that similar products are obtained since reactions in both diluents are by oxidation followed rupture of the weak ether linkage. The fast rate constants of the reactions of two hydrophilic DGAs with the oxidizing •OH radical product of water radiolysis are also shown. Since water-soluble DGAs have been proposed for use as stripping or holdback agents in both European and American fuel cycle scenarios this work was performed in collaboration with colleagues at Forschungszentrum Jülich (FZJ).},
doi = {10.2172/1468541},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {9}
}

Technical Report:

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