Asymmetric or composite polyquinoxaline base membranes, possible application to gaseous permeation and more particularly gaseous mixture fractionation, and mainly dehydration and deacidification of gases, especially gaseous hydrocarbons
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United States of America Patent
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Mar 22, 1988
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N/A
app pub date -
Feb 10, 1986
filing date -
Feb 11, 1985
priority date (Note) -
Expired
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Abstract
The present invention relates to an asymmetric gaseous permeation membrane, also applicable to fractionation of a gaseous mixture and in particular dehydration and deacidification of gases, in particular gaseous hydrocarbons, and obtained from polymers of the polyquinoxaline family presenting the unit: ##STR1## and R=H or phenyl radical G=carbon-carbon bond, or --O--, --S--, --SO.sub.2 --, --CO--##STR2## presenting a dense 'skin' of low thickness of 0.05 to a few microns substantially without defects to permit gas molecules to pass through by a dissolution-diffusion mechanism.
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