Affinity dialysis - a method of continuous, rapid metal ion separation using dialysis membranes and selective, water-soluble polymers as extractants
A membrane process utilizing dialysis and selective complexation by water-soluble polymers has been developed. This process, termed affinity dialysis, has been shown to be selectively extract and concentrate both cations and anions in a manner similar to ion exchange or solvent extraction. The selective removal of calcium from sodium with selectivity of about 30, removal of chromate ion from dilute streams, and separation of transition metal ions such as Cu/Fe and Cu/Zn have all been successfully demonstrated. Effects of different polymers, polymer concentration, temperature, and flow rates have been studied. The effect of increased polymer concentration is to increase product concentration if appropriate changes in feed, polymer solution, and strip flow rates are made. A continuous polymer solution recycle and regeneration system has been constructed and operated with Cu/Zn and chromate/chloride feed streams. Removal of over 95% of the desired ion in one pass and concentration factors of product over effluent in excess of 100 have been achieved at feed flow rates of 24 gal/d. Product concentrations of greater than 3% from as little as 400 ppm feed have been demonstrated in a continuous process. In addition, the degree of polymer loss to the effluent stream has been shown to be less than 0.01%/d for a typical system. Metal removal from typical feeds is about 0.9 g/m/sup 2/ per 1000 ppm metal in the feed. It is expected that this technique may be useful in the separation of organic and biological materials, as well as for ionic species.
- Research Organization:
- Standard Oil Co., Cleveland, OH (USA)
- OSTI ID:
- 6223014
- Journal Information:
- Sep. Sci. Technol.; (United States), Vol. 23:10-11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
CALCIUM
REMOVAL
CHROMATES
COPPER
IRON
MEMBRANES
EFFICIENCY
ORGANIC POLYMERS
SODIUM
ZINC
ANIONS
CATIONS
COMPLEXES
DIALYSIS
EXPERIMENTAL DATA
FLOW RATE
MASS TRANSFER
PERMEABILITY
QUANTITY RATIO
SOLUTES
TEMPERATURE DEPENDENCE
WASTE WATER
ALKALI METALS
ALKALINE EARTH METALS
CHARGED PARTICLES
CHROMIUM COMPOUNDS
DATA
ELEMENTS
HYDROGEN COMPOUNDS
INFORMATION
IONS
LIQUID WASTES
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLYMERS
SEPARATION PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WASTES
WATER
400105* - Separation Procedures
520200 - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)