Aggregation of dialkyl-substituted diphosphonic acids and its effect on metal ion extraction.

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Solvent extraction reagents containing the diphosphonic acid group exhibit an extraordinary affinity for tri-, tetra- and hexavalent actinides. Their use has been considered for actinide separation and pre-concentration procedures. Solvent extraction data obtained with P,P{prime}-di(2-ethylhexyl) methane-, ethane- and butanediphosphonic acids exhibit features that are difficult to explain without Knowledge of the aggregation state of the extractants. Information about the aggregation of the dialkyl-substituted diphosphonic acids in aromatic diluents has been obtained using the complementary techniques of vapor pressure osmometry (VPO), small angle neutron scattering (SANS), infrared spectroscopy and molecular mechanics. The results from these techniques provide an understanding of the ... continued below

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23 p.

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Chiarizia, R.; Barrans, R. E., Jr.; Ferraro, J. R. Herlinger, A. W. & McAlister, D. R. October 22, 1999.

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Solvent extraction reagents containing the diphosphonic acid group exhibit an extraordinary affinity for tri-, tetra- and hexavalent actinides. Their use has been considered for actinide separation and pre-concentration procedures. Solvent extraction data obtained with P,P{prime}-di(2-ethylhexyl) methane-, ethane- and butanediphosphonic acids exhibit features that are difficult to explain without Knowledge of the aggregation state of the extractants. Information about the aggregation of the dialkyl-substituted diphosphonic acids in aromatic diluents has been obtained using the complementary techniques of vapor pressure osmometry (VPO), small angle neutron scattering (SANS), infrared spectroscopy and molecular mechanics. The results from these techniques provide an understanding of the aggregation behavior of these extractants that is fully compatible with the solvent extraction data. The most important results and their relevance to solvent extraction are reviewed in this paper.

Physical Description

23 p.

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OSTI as DE00750452

Medium: P; Size: 23 pages

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  • 11th Symposium on Separation Science and Technology for Energy Applications, Gatlinburg, TN (US), 10/18/1999--10/21/1999

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  • Report No.: ANL/CHM/CP-98671
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 750452
  • Archival Resource Key: ark:/67531/metadc708730

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  • October 22, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 10, 2017, 3:43 p.m.

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Chiarizia, R.; Barrans, R. E., Jr.; Ferraro, J. R. Herlinger, A. W. & McAlister, D. R. Aggregation of dialkyl-substituted diphosphonic acids and its effect on metal ion extraction., article, October 22, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc708730/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.