Ion-pair sorption of alkali metal chlorides by crown ether carboxamide resins
Journal Article
·
· Separation Science and Technology
- Saga Univ., Honjo-Machi, Saga (Japan)
- Texas Tech Univ., Lubbock, TX (United States); and others
Ten crown ether carboxamide resins are prepared by condensation polymerization of N,N-dialkyl sym-(R)dibenzo-16-crown-5-oxyacetamide monomers with formaldehyde in formic acid. Competitive ion-pair sorption of alkali metal chlorides from aqueous methanol solutions by these novel resins reveals that both sorption selectivity and efficiency are influenced by: (1) the conformational positioning of the pendant carboxamide group with respect to the crown ether cavity; (2) the length of the N,N-dialkyl chains on the pendant carboxamide group; (3) the methanol content of the aqueous methanol solution; (4) the concentration of alkali metal chlorides in the sample solution; and (5) the temperature of the sample solution. The highest sorption efficiency and Na{sup +} selectivity are obtained for a resin prepared from N,N-dibutyl sym-(propyl)dibenzo-16-crown-5-oxacetamide monomer in which the geminal propyl group orients the carboxamide-containing side arm over the crown ether cavity. Lengthening the alkyl chains in the carboxamide group is detrimental to both sorption efficiency and selectivity. A very sharp response of alkali metal chloride sorption to the methanol content of the sample solution is noted for the crown ether resins which possess preorganized carboxamide side arms.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG03-94ER14416
- OSTI ID:
- 441435
- Journal Information:
- Separation Science and Technology, Journal Name: Separation Science and Technology Journal Issue: 16 Vol. 31; ISSN 0149-6395; ISSN SSTEDS
- Country of Publication:
- United States
- Language:
- English
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