Studies of the size-selective extraction of alkali metal ions by the synergistic extraction system, crown ether-di(2-ethylhexyl) phosphoric acid-benzene
- Coll. of Charleston, SC
In order to take practical advantage of the size-selective cation-coordinating ability of the cyclic polyethers (crown ethers), experiments seeking a means of avoiding the problem of solubilizing a mineral-acid anion in a nonpolar organic diluent were performed. Mixtures of several known extractants and crown ethers were tried. Results presented indicate that organic soluble cation exchangers mixed in solution with crown ethers produce a synergistic extractant mixture that largely exhibits the size-selective properties expected of the crown ether. Data are presented for the extraction of macro concentrations of alkali metals by di(2-ethylhexyl) phosphoric acid - dicyclohexyl-18-crown-6 mixtures at a single pH, and at nonloading condition (..sigma.. metal conc < 0.04 M) as a function of pH, 2 to 6. In both cases potassium is synergized most strongly presumably because of its best fit to the crown ether cavity. Other data indicate, however, that the size-fit principle is not as consistent for all alkali metal ions and crown ethers as for potassium and dicyclohexyl-18-crown-6. Other effects such as competition for ion hydration and aqueous-phase distribution of the complex may have important effects that have not been elucidated.
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 7149338
- Journal Information:
- Sep. Sci. Technol.; (United States), Journal Name: Sep. Sci. Technol.; (United States) Vol. 15:4; ISSN SSTED
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400105* -- Separation Procedures
ALCOHOLS
ALKALI METAL COMPLEXES
ALKALI METALS
AROMATICS
BENZENE
CESIUM
CESIUM COMPLEXES
COMPARATIVE EVALUATIONS
COMPLEXES
ELEMENTS
ESTERS
EXTRACTION
GLYCOLS
HDEHP
HYDROCARBONS
HYDROXY COMPOUNDS
METALS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
ORGANIC POLYMERS
PH VALUE
PHOSPHORIC ACID ESTERS
POLYETHYLENE GLYCOLS
POLYMERS
POTASSIUM
POTASSIUM COMPLEXES
RUBIDIUM
RUBIDIUM COMPLEXES
SEPARATION PROCESSES
SODIUM
SODIUM COMPLEXES
SOLVENT EXTRACTION
SYNERGISM