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US4932983A
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Copolyimide gas separation membranes derived from substituted methylene dianilines and unsubstituted diamines
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 Semiflexible aromatic polyimides for preparing gas separation membranes and the process of using to separate at least one gas from a mixture of gases is disclosed. The aromatic polyimides are prepared by polycondensation of aromatic tetracarboxylic dianhydrides with 20 to 80 mol percent of a methylene dianiline which is alkyl substituted on all positions ortho to the amine functions. The remaining diamine constituent is not so substituted.
Inventors
- 👤 Richard A. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:13
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/58; B01D71/62; B01D71/64; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1042
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
144 words
A process for separating two or more gases from a mixture of gases comprising the steps of bringing such mixture of gases into contact with one side of a permselective membrane which is formed of an aromatic polyimide consisting essentially of repeating units of the formula: ##STR9## where --Ar-- is ##STR10## or mixtures thereof, --Ar'-- is ##STR11## or mixtures thereof, ##STR12## is ##STR13## or mixtures thereof, --X, --X 1 , --X 2 , and --X 3 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms, --Y and --Y 1 are independently --H, --X, --X 1 , --X 2 , or --X 3 . and --R'-- is ##STR14## where n=0 to 4 alkylene radicals of 1 to 3 carbon atoms, or mixtures thereof r=20 to 80 mol % t=20 to 80 mol % t=100 mol % minus r s=100 mol %.
Claim 2
Dependent Claim
144 words
A process for separating two or more gases from a mixture of gases comprising the steps of bringing such mixture of gases into contact with one side of a permselective membrane which is formed of an aromatic polyimide consisting essentially of repeating units of the formula: ##STR9## where --Ar-- is ##STR10## or mixtures thereof, --Ar'-- is ##STR11## or mixtures thereof, ##STR12## is ##STR13## or mixtures thereof, --X, --X 1 , --X 2 , and --X 3 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms, --Y and --Y 1 are independently --H, --X, --X 1 , --X 2 , or --X 3 . and --R'-- is ##STR14## where n=0 to 4 alkylene radicals of 1 to 3 carbon atoms, or mixtures thereof r=20 to 80 mol % t=20 to 80 mol % t=100 mol % minus r s=100 mol %.
Claim 3
Dependent Claim
7 words
The process of claim 1 wherein ##STR15##
Claim 4
Dependent Claim
9 words
The process of claim 2 wherein --R'-- is ##STR16##
Claim 5
Dependent Claim
9 words
The process of claim 3 wherein --Ar'-- is ##STR17##
Claim 6
Dependent Claim
29 words
The process of claim 4 wherein --X, --X 1 , --X 2 and --X 3 are --CH 3 , --C 2 H 5 or --CH(CH 3 ) 2 .
Claim 7
Dependent Claim
9 words
The process of claim 5 wherein --Ar'-- is ##STR18##
Claim 8
Dependent Claim
9 words
The process of claim 5 wherein --Ar'-- is ##STR19##
Claim 9
Dependent Claim
9 words
The process of claim 5 wherein --Ar'-- is ##STR20##
Claim 10
Dependent Claim
9 words
The process of claim 5 wherein --Ar'-- is ##STR21##
Claim 11
Dependent Claim
19 words
The process of claim 1 wherein said alkyl groups are selected from the group of methyl, ethyl, and isopropyl.
Claim 12
Dependent Claim
116 words
An aromatic polyimide gas separation membrane wherein the aromatic polyimide consists essentially of repeating units of the formula: ##STR22## where --Ar-- is ##STR23## or mixtures thereof, --Ar'-- is ##STR24## or mixtures thereof, ##STR25## is ##STR26## or mixtures thereof, --X, --X 1 , --X 2 , and --X 3 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms, --Y and --Y 1 are independently --H, --X, --X 1 , --X 2 , or --X 3 . and --R'-- is ##STR27## where n=0 to 4 alkylene radicals of 1 to 3 carbon atoms, or mixtures thereof r=20 to 80 mol % t=20 to 80 mol % t=100 mol % minus r s=100 mol %.
Claim 13
Dependent Claim
116 words
An aromatic polyimide gas separation membrane wherein the aromatic polyimide consists essentially of repeating units of the formula: ##STR22## where --Ar-- is ##STR23## or mixtures thereof, --Ar'-- is ##STR24## or mixtures thereof, ##STR25## is ##STR26## or mixtures thereof, --X, --X 1 , --X 2 , and --X 3 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms, --Y and --Y 1 are independently --H, --X, --X 1 , --X 2 , or --X 3 . and --R'-- is ##STR27## where n=0 to 4 alkylene radicals of 1 to 3 carbon atoms, or mixtures thereof r=20 to 80 mol % t=20 to 80 mol % t=100 mol % minus r s=100 mol %.
Claim 14
Dependent Claim
7 words
The membrane of claim 11 wherein ##STR28##
Claim 15
Dependent Claim
9 words
The membrane of claim 12 wherein --R'-- is ##STR29##
Claim 16
Dependent Claim
9 words
The membrane of claim 13 wherein --Ar'-- is ##STR30##
Claim 17
Dependent Claim
29 words
The membrane of claim 14 wherein --X, --X 1 , --X 2 and --X 3 are --CH 3 , --C 2 H 5 or --CH(CH 3 ) 2 .
Claim 18
Dependent Claim
9 words
The membrane of claim 15 wherein --Ar'-- is ##STR31##
Claim 19
Dependent Claim
9 words
The membrane of claim 15 wherein --Ar'-- is ##STR32##
Claim 20
Dependent Claim
9 words
The membrane of claim 15 wherein --Ar'-- is ##STR33##
Claim 21
Dependent Claim
9 words
The membrane of claim 15 wherein --Ar'-- is ##STR34##
Claim 22
Dependent Claim
19 words
The membrane of claim 11 wherein said alkyl groups are selected from the group of methyl, ethyl, and isopropyl.
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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 |