Gamma Radiolysis of Phenyl-Substituted TODGAs: Part I

Zarzana, Christopher A.; McAlpine, Jack; Wilden, Andreas; Hupert, Michelle; Stärk, Andrea; Iqbal, Mudassir; Verboom, Willem; Mincher, Bruce J.; Groenewold, Gary S.; Modolo, Giuseppe

doi:10.1080/07366299.2023.2220765

Gamma Radiolysis of Phenyl-Substituted TODGAs: Part I

Journal Article · Thu Jul 06 00:00:00 EDT 2023 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299.2023.2220765· OSTI ID:1991256

^[1]; McAlpine, Jack ^[2]; ^[3]; ^[3]; Stärk, Andrea ^[3]; ^[4]; ^[5]; ^[1]; ^[1]; ^[6]

Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States); University of Idaho, Moscow, ID (United States)
Forschungszentrum Jülich GmbH, Jülich (Germany)
National University of Sciences and Technology (NUST), Islamabad (Pakistan)
University of Twente, Enschede (Netherlands)
Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Nukleare Entsorgung (IEK-6), Jülich, Germany

The radiolytic stabilities of three phenylated analogs of N,N,N’,N’-tetraoctyl diglycolamide (TODGA) were investigated: 2-(2-(di-n-octylamino)-2-oxoethoxy)-N,N-di-n-octyl-2-phenylacetamide (PhTODGA), which has a phenyl substituent bound to a central methylene, 2-(2-(di-n-octylamino)-2-oxo-1-phenylethoxy)-N,N-di-n-octylpropanamide (PhMeTODGA), which also contains a methyl substituent bound to the methylene on the other side of the ether moiety, and, 2-(2-N-n-hexyl-N-phenylamino)-2-oxoethoxy)-N-n-hexyl-N-phenylacetamide (DHDPDGA), which has phenyl substituents located on the amide groups instead of the central methylenes. The objective of Part I of this series of papers covers was to evaluate the contribution of the phenyl group to the radiolytic stability of these diglycolamides when irradiated in a) n-dodecane, and b) n-dodecane in the presence of a nitric acid-containing aqueous phase. The results indicate that the presence of the phenyl group decreases the overall radiolytic stability compared to unsubstituted TODGA. However, the results also indicate that the phenyl groups interact with nitric acid in a cooperative fashion that enhances the radiation stability of the phenylated diglycolamide (DGA) derivatives in the presence of a nitric acid-containing aqueous phase compared to irradiation in only n-dodecane. So, the results are consistent with the hypothesized formation of nitric acid-phenylated DGA complexes in the n-dodecane phase that are significantly more stable with respect to gamma irradiation, compared to the phenylated DGA molecules alone.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE); European Commission

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1991256

Report Number(s):: INL/JOU-19-55675-Revision-1

Journal Information:: Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 5 Vol. 41; ISSN 0736-6299

Publisher:: Taylor and FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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