Filled superglassy membrane
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United States of America Patent
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-
Nov 13, 2001
Grant Date -
N/A
app pub date -
Sep 1, 1999
filing date -
Sep 1, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A membrane and membrane separation process useful in gas, vapor and liquid separations. The membrane comprises a separating layer of a polymer that is characterized by a high glass transition temperature, T.sub.g, such as at least about 100.degree. C., and a high free volume within the polymer material itself, such as a fractional free volume of at least about 0.20. Within the polymer material are dispersed fine non-porous particles, such as silica or carbon black particles, having an average diameter no greater than about 1,000 .ANG.. The membrane is particularly useful for separating C.sub.3+ hydrocarbons from other gases.
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