Polyimide and polyamide-imide gas separation membranes
AssigneesE. I. Du Pont de Nemours and Company, L'Air Liquides, SA
InventorsJohn W. Simmons, Okan M. Ekiner
Life of this patent
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Abstract
Novel polyimide and polyamide-imide gas separation membranes and the process of using such membranes to separate one or more gases from a gaseous mixture is disclosed. The polyimides and polyamide-imides are formed from a blend of diamines containing the ester derived from 1,3-diamino-2-hydroxypropane.
Claims2
A process for separating one or more gases from a gaseous mixture comprising bringing said gaseous mixture into contact with the first side of a gas separation membrane formed from a polyimide comprising repeating units of the formula:
- ##STR23## where ##STR24## is independently ##STR25## or mixtures thereof:
- --R'-- is ##STR26## or mixtures thereof, where Z is independently --H, alkyl groups having 1 to 6 carbon atoms, aromatic groups having 6 to 12 carbon atoms, or halogen groups such as --F, Cl, --Br, or --I, where n is an integer from 0 to 4. R" is ##STR27## or mixtures thereof;
- Ar is any aromatic diamine residue;
- Q is an alkyl group having 1-10 carbon atoms or an aromatic group having 6-12 carbon atoms;
- t is a fraction from 0.01 to about 0.75 and s is a fraction from 0 to 1.0, in a manner to cause a portion of the mixture to pass through the membrane to a permeate side, the resulting gas mixture on the permeate side being enriched in one or more component over that of the mixture on the first side.
A process for separating one or more gases from a gaseous mixture comprising bringing said gaseous mixture into contact with the first side of a gas separation membrane formed from a polyamide-imide containing repeating units of the formula:
- ##STR28## where ##STR29## is independently ##STR30## or mixtures thereof;
- --R'-- is ##STR31## or mixtures thereof, where Z is independently --H, alkyl groups having 1 to 6 carbon atoms, aromatic groups having 6 to 12 carbon atoms, or halogen groups such as --F, Cl, --Br, or --I, where n is an integer from 0 to 4;
- R" is ##STR32## or mixtures thereof;
- Ar is any aromatic diamine residue;
- Ra is any aromatic diacid moiety;
- Rb is any aromatic triacid moiety;
- Q is an alkyl group having 1-10 carbon atoms or an aromatic group having 6-12 carbon atoms;
- t is a fraction from 0.01 to about 0.75;
- x, y and z are fractions and x+y+z=1 and s+s'+t=1, in a manner to cause a portion of the mixture to pass through the membrane to a permeate side, the resulting gas mixture on the permeate side being enriched in one or more component over that of the mixture on the first side.
Dependencies are inferred from the claim text.