Semipermeable membranes based on specific 4,4'-(1H-alkylidene)bis[2,3,6-trialkylphenol]type polyesters
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United States of America Patent
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Feb 19, 1991
Issued Date -
N/A
app pub date -
Dec 6, 1989
filing date -
Dec 27, 1988
priority date (Note) -
Expired
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Abstract
Permeable membranes comprised predominantly of specifically defined polyester of 4,4'-(1H-alkylidene)bis[2,3,6-trialkylphenol] and aromatic dicarboxylic acids. The invention also pertains to the novel permeation processes for recovery of an oxygen/nitrogen or carbon dioxide/methane or helium/methane component from a mixture of said component with other components in the mixture.
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