Surface modified gas separation membranes
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United States of America Patent
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May 9, 1989
Issued Date -
N/A
app pub date -
Jan 11, 1988
filing date -
Aug 1, 1986
priority date (Note) -
Expired
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Abstract
A method of using an improved membrane to separate gases is described. The membrane is surface treated by exposing at least one surface of a semipermeable membrane to gaseous fluorine or a combination of gaseous fluorine and sulfur dioxide. The modified membrane contains fluorine or fluorine and sulfur oxide functionalities at the membrane surface, thereby enhancing the gas separation properties of the membrane. The membrane may be used to separate gas mixtures such as carbon dioxide and methane, oxygen and nitrogen, or nitrogen and methane.
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