Solvent Extraction Separation of Trivalent Americium from Curium and the Lanthanides

Jensen, Mark P.; Chiarizia, Renato; Ulicki, Joseph S.; Spindler, Brian D.; Murphy, Daniel J.; Hossain, M. Mahmun; Roca-Sabio, Adrián; de Blas, Andrés; Rodríguez-Blas, Teresa

doi:10.1080/07366299.2015.1046292

Solvent Extraction Separation of Trivalent Americium from Curium and the Lanthanides

Journal Article · Fri Feb 27 04:00:00 EST 2015 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299.2015.1046292· OSTI ID:1391888

Jensen, Mark P.; Chiarizia, Renato; Ulicki, Joseph S.; Spindler, Brian D.; Murphy, Daniel J.; Hossain, M. Mahmun; Roca-Sabio, Adrián; de Blas, Andrés; Rodríguez-Blas, Teresa

The sterically constrained, macrocyclic, aqueous soluble ligand N,N'-bis[(6-carboxy-2-pyridyl)methyl]-1,10-diaza-18-crown-6 (H2BP18C6) was investigated for separating americium from curium and all the lanthanides by solvent extraction. Pairing H2BP18C6, which favors complexation of larger f-element cations, with acidic organophosphorus extractants that favor extraction of smaller f-element cations, such as bis-(2-ethylhexyl)phosphoric acid (HDEHP) or (2-ethylhexyl)phosphonic acid mono(2-ethylhexyl) ester (HEH[EHP]), created solvent extraction systems with good Cm/Am selectivity, excellent trans-lanthanide selectivity (Kex,Lu/Kex,La = 108), but poor selectivity for Am against the lightest lanthanides. However, using an organic phase containing both a neutral extractant, N,N,N’,N’-tetra(2-ethylhexyl)diglycolamide (TEHDGA), and HEH[EHP] enabled rejection of the lightest lanthanides during loading of the organic phase from aqueous nitric acid, eliminating their interference in the americium stripping stages. In addition, although it is a macrocyclic ligand, H2BP18C6 does not significantly impede the mass transfer kinetics of the HDEHP solvent extraction system

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science - Office of Basic Energy Sciences - Chemical Sciences, Geosciences, and Biosciences Division; USDOE Office of Nuclear Energy - Office of Fuel Cycle Technologies - Fuel Cycle Research and Development

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1391888

Journal Information:: Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 4 Vol. 33; ISSN 0736-6299

Publisher:: Taylor and Francis

Country of Publication:: United States

Language:: English

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