Gas separations with high-flux cellulose acetate membranes
The high-flux cellulose acetate membranes used in desalination by reverse osmosis have been shown to consist of a dense layer, perhaps 0.2 mu m thick, supported on a highly porous substructure. Because they have a very thin diffusion barrier, high-flux cellulose acetate membranes permit a high gas permeation rate through a highly selective amorphous polymer. To examine the trade-off between high flow rates and separating efficiency, the data for cellulose acetate are compared in tabular form with data for other materials previously tabulated by Stern et al. According to Stern, Teflon FEP is available in 25-mu m thickness without pinholes. Such a membrane would give a helium flow rate only one-fiftieth that of the better of the high-flux cellulose acetates if both were operated at 80/sup 0/C. This temperature appears to be satisfactory for Teflon FEP but may be near the upper limit for cellulose acetate. The separation factors obtained with the cellulose acetate samples used were comparable to those reported for Teflon FEP.
- Research Organization:
- Gulf General Atomic Inc.
- OSTI ID:
- 5568252
- Journal Information:
- Ind. Eng. Chem. Process Des. Dev.; (United States), Journal Name: Ind. Eng. Chem. Process Des. Dev.; (United States) Vol. 9:2; ISSN IEPDA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
030300* -- Natural Gas-- Drilling
Production
& Processing
030400 -- Natural Gas-- Products & By-Products
ACETATES
CARBOHYDRATES
CARBOXYLIC ACID SALTS
CELLULOSE
COMPARATIVE EVALUATIONS
CONTROL
DEMINERALIZATION
DENSITY
DESALINATION
DIFFUSION
DIFFUSION BARRIERS
DIMENSIONS
ELEMENTS
ENERGY SOURCES
EXTRACTION
FLUID FLOW
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FLOW
GAS FUELS
GASES
HALOGENATED ALIPHATIC HYDROCARBONS
HELIUM
LAYERS
MANAGEMENT
MATERIALS
MATERIALS RECOVERY
MEMBRANES
NATURAL GAS
NONMETALS
OPENINGS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
OSMOSIS
PERMEABILITY
PETROCHEMICALS
PETROLEUM
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
PLASTICS
POLYETHYLENES
POLYMERS
POLYOLEFINS
POLYSACCHARIDES
POLYTETRAFLUOROETHYLENE
POROUS MATERIALS
PROCESSING
RARE GASES
RECOVERY
SACCHARIDES
SEPARATION PROCESSES
SYNTHETIC MATERIALS
TEFLON
TEMPERATURE CONTROL
THICKNESS
WASTE MANAGEMENT
WASTE PROCESSING