Abstract
Fluorinated alcohols are being used as diluent modifiers for the selective extraction of cesium from caustic media by calixarene-crown ethers. Previous work has established the equilibria taking place in solution during cesium extraction and the stoichiometry of the complexes formed in the organic phase, but the aggregation behaviour of the modifiers remains to be precisely understood. Therefore, vapour pressure osmometry experiments were carried out to gain further insight. The aggregation state of a variety of fluorinated and non-fluorinated alkylphenoxy alcohols and 1-decanol in n-heptane, was determined at 25°C. These alcohols were found to form aggregates containing between three and five (most frequently four) molecules. Introduction of these independently investigated aggregation equilibria for the solvent modifiers in the data modeling improved the ability of our extraction model to correctly predict metal distribution ratios.
Original language | English |
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Pages (from-to) | 145-169 |
Number of pages | 25 |
Journal | Solvent Extraction and Ion Exchange |
Volume | 23 |
Issue number | 2 |
DOIs | |
State | Published - Mar 2005 |
Funding
Work performed under the auspices of the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U. S. Department of Energy, under contract number DE-AC05-00OR22725 with Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC., and under contract No. W-31-109-ENG-38, for the part performed at Argonne National Laboratory.
Keywords
- Aggregation
- Calixarene crown ethers
- Fluorinated solvent modifiers
- Osmometry