Gas separation membrane
AssigneeInstitut Francais du Petrole
InventorsRene Avrillon, Andre Deschamps, Alain Driancourt, Jean-Claude Mileo, Eric Robert
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Abstract
Disclosed is a gas separation membrane, comprising a film with a thickness ranging from 0.05.10.sup.-6 to 20.10.sup.-6 m, at least 90% by mole of which is at least one aromatic polyimide or copolyimide, the recurrent unit of which corresponds to the following formula (I): ##STR1## where A represents a tetravalent aromatic radical at least 50% by mole of which are represented by the following formula (II): ##STR2## and B represents a bivalent aromatic radical or a mixture of bivalent aromatic radicals.
Claims10
A gas separation membrane comprising at least one film of a thickness ranging from 0.05.10.sup.-6 to 20.10.sup.-6 m, at least 90% by mole of which is at least one aromatic polyimide or copolyimide, the recurrent unit of which has formula (I):
- ##STR12## where A represents a tetravalent aromatic radical, at least 50% by mole of which have formula (II):
- ##STR13## and B represents a bivalent aromatic radical or a mixture of bivalent aromatic radicals.
Dependencies are inferred from the claim text.