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US4932982A
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Copolyimide gas separation membranes derived from substituted phenylene diamines and substituted methylene dianilines
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1989-06-01
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Granted: 1990-06-12
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Expires: 2009-06-01
Abstract
Abstract An aromatic copolyimide gas separation membrane and the process of using it to separate one or more gases from a mixture of gases are disclosed. The aromatic copolyimide is the condensation product of a aromatic tetracarboxylic dianhydride with a phenylene diamine and a methylene dianiline both of which diamines are substituted with alkyl groups on all positions ortho to the amino groups.
Inventors
- 👤 Richard A. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:59
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1042; B; B01; B01D; B01D71/00; B01D71/06; B01D71/58; B01D71/62; B01D71/64
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
140 words
A process for separating one or more gases from a mixture of gases comprising bringing said mixture of gases into contact with a gas separation membrane formed from an aromatic copolyimide consisting essentially of repeating units of the formula: ##STR8## where --Ar-- is ##STR9## or mixtures thereof, --Ar'-- is ##STR10## or mixtures thereof, is ##STR11## or mixtures thereof --X, --X 1 , --X 2 and --X 3 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms, --Z is --H, --X 1 , --X 2 , or --X 3 --Y and --Y 1 are independently --H, --X, --X 1 , --X 2 , --X 3 or halogen and --R'-- is ##STR12## where n=0 to 4 or alkylene radicals of 1 to 3 carbon atoms, and where r=15 to 95 mol %, t=5 to 85 mol %, s=100%.
Claim 2
Dependent Claim
140 words
A process for separating one or more gases from a mixture of gases comprising bringing said mixture of gases into contact with a gas separation membrane formed from an aromatic copolyimide consisting essentially of repeating units of the formula: ##STR8## where --Ar-- is ##STR9## or mixtures thereof, --Ar'-- is ##STR10## or mixtures thereof, is ##STR11## or mixtures thereof --X, --X 1 , --X 2 and --X 3 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms, --Z is --H, --X 1 , --X 2 , or --X 3 --Y and --Y 1 are independently --H, --X, --X 1 , --X 2 , --X 3 or halogen and --R'-- is ##STR12## where n=0 to 4 or alkylene radicals of 1 to 3 carbon atoms, and where r=15 to 95 mol %, t=5 to 85 mol %, s=100%.
Claim 3
Dependent Claim
7 words
The process of claim 1 where ##STR13##
Claim 4
Dependent Claim
9 words
The process of claim 2 wherein --R'-- is ##STR14##
Claim 5
Dependent Claim
17 words
The process of claim 9 where r=15 to 90 mol % and t=10 to 85 mol %.
Claim 6
Dependent Claim
25 words
The process of claim 1 where --X, --X 1 , --X 2 and --X 3 are --CH 3 , or --CH(CH 3 ) 2 .
Claim 7
Dependent Claim
14 words
The process of claim 1 where --Z, --Y, and --Y 1 , are --H.
Claim 8
Dependent Claim
118 words
A gas separation membrane formed from an aromatic copolyimide consisting essentially of repeating units of the formula: ##STR15## where --Ar-- is ##STR16## or mixtures thereof, --Ar'-- is ##STR17## or mixtures thereof, ##STR18## or mixtures thereof --X, --X 1 , --X 2 and --X 3 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms, --Z is --H, --X, --X 1 , --X 2 , or --X 3 --Y and --Y 1 are independently --H, --X, --X 1 , --X 2 , --X 3 or halogen and --R'-- is ##STR19## where n=0 to 4 or alkylene radicals of 1 to 3 carbon atoms, and where r=15 to 95 mol %, t=5 to 85 mol %, s=100%.
Claim 9
Dependent Claim
118 words
A gas separation membrane formed from an aromatic copolyimide consisting essentially of repeating units of the formula: ##STR15## where --Ar-- is ##STR16## or mixtures thereof, --Ar'-- is ##STR17## or mixtures thereof, ##STR18## or mixtures thereof --X, --X 1 , --X 2 and --X 3 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms, --Z is --H, --X, --X 1 , --X 2 , or --X 3 --Y and --Y 1 are independently --H, --X, --X 1 , --X 2 , --X 3 or halogen and --R'-- is ##STR19## where n=0 to 4 or alkylene radicals of 1 to 3 carbon atoms, and where r=15 to 95 mol %, t=5 to 85 mol %, s=100%.
Claim 10
Dependent Claim
9 words
The gas separation membrane of claim 7 where ##STR20##
Claim 11
Dependent Claim
11 words
The gas separation membrane of claim 8 where --R'-- is ##STR21##
Claim 12
Dependent Claim
19 words
The gas separation membrane of claim 9 where r=15 to 90 mole % and t=10 to 85 mol %.
Claim 13
Dependent Claim
32 words
The gas separation membrane of claim 10 where --X, --X 1 , --X 2 , and --X 3 are --CH 3 , --C 2 H 5 or --CH(CH 3 ) 2 .
Claim 14
Dependent Claim
16 words
The gas separation membrane of claim 11 where --Z, --Y and --Y 1 , are --H.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |