skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Extraction of lanthanides(III) and Am(III) by mixtures of malonamide and dialkylphosphoric acid.

Abstract

No abstract prepared.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); CEA
OSTI Identifier:
928638
Report Number(s):
ANL/CHM/JA-57723
Journal ID: ISSN 0736-6299; SEIEDB; TRN: US0803402
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Solvent Extr. Ion Exch.; Journal Volume: 25; Journal Issue: 3 ; May/Jun. 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; SOLVENT EXTRACTION; AMERICIUM; RARE EARTHS; MIXTURES; ORGANIC PHOSPHORUS COMPOUNDS; AMIDES; SOLVENT PROPERTIES

Citation Formats

Gannaz, B., Chiarizia, R., Antonio, M. R., Hill, C., Cote, G., Chemistry, CEA, and ENSCP. Extraction of lanthanides(III) and Am(III) by mixtures of malonamide and dialkylphosphoric acid.. United States: N. p., 2007. Web. doi:10.1080/07366290701285512.
Gannaz, B., Chiarizia, R., Antonio, M. R., Hill, C., Cote, G., Chemistry, CEA, & ENSCP. Extraction of lanthanides(III) and Am(III) by mixtures of malonamide and dialkylphosphoric acid.. United States. doi:10.1080/07366290701285512.
Gannaz, B., Chiarizia, R., Antonio, M. R., Hill, C., Cote, G., Chemistry, CEA, and ENSCP. Tue . "Extraction of lanthanides(III) and Am(III) by mixtures of malonamide and dialkylphosphoric acid.". United States. doi:10.1080/07366290701285512.
@article{osti_928638,
title = {Extraction of lanthanides(III) and Am(III) by mixtures of malonamide and dialkylphosphoric acid.},
author = {Gannaz, B. and Chiarizia, R. and Antonio, M. R. and Hill, C. and Cote, G. and Chemistry and CEA and ENSCP},
abstractNote = {No abstract prepared.},
doi = {10.1080/07366290701285512},
journal = {Solvent Extr. Ion Exch.},
number = 3 ; May/Jun. 2007,
volume = 25,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}
  • Extraction of Am(III), and Eu(III) and U(VI) from perchloric acid solutions by dialkyl(diaryl) [diethyl-carbamoylmethyl] phosphine oxides (CMPO) has been investigated. It has been shown that elements are extracted more effectively from perchloric acid solutions than from nitric acid. An `anomalous aryl effect` increases sufficiently in perchloric media as compared with nitric media. Solvate numbers of elements also increase in perchloric acid, they being extremely high for aryl-substituted reagents and not so high for alkyl-substituted compounds. It has been shown that in HNO{sub 3} and HClO{sub 4} solutions the value of `anomalous aryl effect` directly depends on the difference in valuesmore » of element solvate numbers in complexes with aryl- and alkyl-substituted CMPO. Am(III), Eu(III) and U(VI) are not practically extracted from phosphoric and sulphuric acids by CMPO solutions. 16 refs., 7 figs., 3 tabs.« less
  • Aggregation phenomena in n-alkane solutions of di-n-hexylphosphoric acid (HDHP), N,N{prime}-dimethyl-N,N{prime}-dioctylhexylethoxymalonamide (DMDOHEMA), and their mixtures, were investigated by electrospray ionization-mass spectrometry (ESI-MS), vapor pressure osmometry (VPO), and small-angle X-ray and neutron scattering (SAXS and SANS). The objective of the study was to probe the formation of mixed HDHP-DMDOHEMA species before and after extraction of trivalent lanthanide and actinide (M{sup 3+}) nitrates. The most important species formed by HDHP upon metal extraction has the composition M(DHP){sub 3}(HDHP){sub 3}(H{sub 2}O). These species exist as spherical aggregates of the reverse micelle type with a polar core diameter of -7 {angstrom} and total diameter ofmore » -11 to -15 {angstrom}. The aggregation of DMDOHEMA is a progressive phenomenon, with an average aggregation number of -2 in the 0.2 to 0.6 M range and larger aggregates forming at higher concentrations. The metal loaded DMDOHEMA aggregates can be considered as interacting spheres with a polar core diameter between -11 and -16 {angstrom}, depending on composition, a total diameter of up to -25 {angstrom}, and a weight-average aggregation number of -9. The results obtained in this work provide strong evidence for the formation of mixed aggregates when mixtures of HDHP and DMDOHEMA are used for the extraction of trivalent Ln and An cations. These mixed reverse micelles have a diameter between 19 and 24 {angstrom} with a polar core diameter of 10 and to 14 {angstrom}. The most recurrent micellar composition is 2 HDHP and either 4 or 5 DMDOHEMA molecules.« less
  • The extraction behavior of Am(III) from nitric acid by octyl(phenyl)-N,N-diisobutylcarbamoylmethyphosphine oxides, O0D(IB)CMPO, in the presence of tributylphosphate, TBP, has been studied using diethylbenzene, decalin, and normal aliphatic hydrocarbon diluents. Relative to O0D(IB)CMPO alone, mixtures of TBP and O0D(IB)CMPO show a slight enhancement in the extraction of Am(III) from nitric acid solution above 2 M and a moderate decrease in extraction for lower acid concentrations. The net effect of TBP addition to O0D(IB)CMPO (as well as other selected carbamoylmethylphosphoryl extractants) is a relative insensitivity of the distribution ratio of Am(III) to HNO/sub 3/ concentration in the range of 0.5 M tomore » 6 M and facilitated stripping of Am(III) with dilute acid. Since a continuous variation study of Am(III) extraction using mixtures of O0D(IB)CMPO and TBP at a fixed total concentration revealed no evidence of a mixed complex, the TBP appears to be behaving primarily as a phase modifier. The most significant benefit gained from addition of TBP to O0D(IB)CMPO is the increased metal ion loading capacity and extractant compatibility with alicyclic and aliphatic diluents. The use of TBP to overcome phase compatibility with other bifunctional extractants of the carbamoylmethylphosphoryl type and the use of other phase modifiers with O0D(IB)CMPO have also been investigated. 15 references, 7 figures, 2 tables.« less