Preparation of gas separation membranes
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United States of America Patent
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-
Jan 6, 1981
Issued Date -
N/A
app pub date -
Nov 8, 1979
filing date -
Nov 8, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Membranes, which may be used for the separation of gases, comprise a thin film of a semi-permeable material composited on a porous support member. The membranes are prepared by passing a support member through a solution of a halogenated hydrocarbon solvent containing a semi-permeable membrane forming prepolymer and cross-linking agent. This step is then followed by the cross-linking of the prepolymer by treatment at an elevated temperature. The process may be exemplified by passing one finely porous surface of a cellulose nitrate-cellulose acetate support member through a solution of dimethyl silicone in a halogenated solvent such as trifluorotrichloroethane followed by treatment at a temperature in the range of from about 50.degree. to about 150.degree. C. to form the desired membrane.
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