Effect of macrocycle type on PbS transport through an emulsion liquid membrane
The relative effectiveness of 14 different macrocycles in transporting Pb(NO3)2 has been determined at 25C using a water-toluene-water emulsion membrane system. The largest amount of PbS transport was found with didecyl-1, 10-diaza-18-crown-6 (91%), followed by dicyclohexano-18-crown-6 (81%), di-tert-butyl-dicyclohexano-18-crown-6 (77%), 1,10-diaza-18-crown-6 (27%), and cryptand 2.2.1(4,7,13,16,21,24-pentoxa-1,10-diazabicyclo(8,8,5)-tricosane) (16%). The use of the other macrocycles produced little PbS transport. Analysis of the transport results shows that, for most effective transport, the macrocycle should distribute preferentially to the organic phase and the log K value for the binding of the macrocycle with PbS must be large enough for quantitative extraction of the PbS into the membrane. However, this log K value must be sufficiently smaller than that for interaction of PbS with P2O7U , the receiving phase complexing agent, to allow a large PbS concentration gradient to be established. These features provide information which should be useful in designing systems for cation separations using emulsion membranes.
- Research Organization:
- Brigham Young Univ., Provo, UT
- DOE Contract Number:
- FG02-86ER13463
- OSTI ID:
- 6370466
- Report Number(s):
- CONF-851011-
- Journal Information:
- Sep. Sci. Technol.; (United States), Journal Name: Sep. Sci. Technol.; (United States) Vol. 22:2/3; ISSN SSTED
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400105 -- Separation Procedures
400201* -- Chemical & Physicochemical Properties
ALCOHOLS
ALKYLATED AROMATICS
AROMATICS
CATIONS
CHARGED PARTICLES
COLLOIDS
DATA
DISPERSIONS
EMULSIONS
EXPERIMENTAL DATA
FLUIDS
GLYCOLS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
IONS
LEAD COMPOUNDS
LIQUIDS
MASS TRANSFER
MEDIUM TEMPERATURE
MEMBRANES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PERFORMANCE
POLYETHYLENE GLYCOLS
POLYMERS
TOLUENE
WATER