Method for selectively separating hydrocarbons
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United States of America Patent
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Jun 26, 2001
Grant Date -
N/A
app pub date -
Aug 11, 1999
filing date -
Aug 17, 1998
priority date (Note) -
Expired
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Abstract
A method for separating specific hydrocarbons from a hydrocarbon mixture of hydrocarbons using a membrane made of a fluorine-containing polyimide resin having high separation ability with regard to certain hydrocarbons, and a high resistance to hydrocarbon is disclosed. The method is of high practicability with regard to performance and cost. Certain hydrocarbons permeate selectively and are separated by bringing a hydrocarbon mixture into contact with a membrane having a fluorine-containing polyimide resin as its main component, whose main component is the minimum repeating unit expressed by ##STR1## The mixture is passed through the membrane, thereby selectively permeating, for example, unsaturated hydrocarbons. The main component of the membrane is a fluorine-containing polyimide resin with a fractional free volume in the range of 0.130-0.175.
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