US3899309A
Expired / Lapsed
US
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Aromatic polyimide, polyester and polyamide separation membranes
Assignee: EIDP Inc
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Filing: 1973-01-11
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Granted: 1975-08-12
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Expires: 1993-01-11
Abstract
Abstract Gas separation membranes are made from aromatic polyimides, polyesters and polyamides in which the repeating unit of the main polymer chain A. HAS AT LEAST ONE RIGID DIVALENT SUBUNIT, THE TWO MAIN CHAIN SINGLE BONDS EXTENDING FROM WHICH ARE NOT COLINEAR, B. IS STERICALLY UNABLE TO ROTATE 360* AROUND AT LEAST ONE OF THESE BONDS, AND C. HAS 50% OR MORE OF ITS MAIN CHAIN ATOMS AS MEMBERS OF AROMATIC RINGS.
Inventors
- 👤 Harvey Herbert Hoehn
- 👤 John W Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:24
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0083; B01D71/00; B01D71/06; B01D71/48; B01D71/56; B01D71/58; B01D71/62; B01D71/64; C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826; C08G69/00; C08G69/02; C08G69/26; C08G69/32; C08G73/00; C08G73/06; C08G73/10; C08G73/1067
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
173 words
THE PROCESS OF SEPARATING FLUIDS USING A SEMIPERMEABLE MEMBRANE OF WHICH AT LEAST 50% BY WEIGHT CONSISTS ESSENTIALLY OF A POLYMER WHOSE MAIN CHAIN HAS A REPEATING UNIT CONTAINING AT LEAST ONE GROUP SELECED FROM THE GROUP CONSISTING OF AROMATIC IMIDE, AROMATIC ESTER AND AROMATIC AMIDE GROUPS, IN WHICH SAID REPEATING UNIT A. CONTAINS AT LEAST ONE RIGID DIVALENT SUBUNIT, THE TWO MAIN CHAIN SINGLE BONDS EXTENDING FROM WHICH ARE NOT COLINEAR, B. IS STERICALLY UNABLE TO ROTATE 360* AROUND ONE OR MORE OF SAID MAIN CHAIN SINGLE BONDS, AND C. HAS MORE THAN 50% OF ITS MAIN CHAIN ATOMS IN AROMATIC GROUPS, THE SAID AROMATIC IMIDE REPEATING UNIT HAVING THE FORMULA -R-N<(-CO-)2>R''<(-CO-)2>NWHEREIN R AND R1 ARE, REPSECTIVELY, A DIVALENT AND TETRAVALENT ORGANIC RADICAL, THE SAID AROMATIC ESTER REPEATING UNIT HAVING THE FORMULA -R2-OOC-R3-COOWHEREIN EACH OF R2 AND R3, ALIKE OR DIFFERENT, IS A DIVALENT ORGANIC RADICAL, AND THE SAID AROMATIC AMIDE REPEATING UNIT HAVING THE FORMULA -R-N(-R7)-CO-R3-CO-N(-R7)WHEREIN R AND R3 ARE AS DEFINED ABOVE AND R7 IS HYDROGEN, LOWER ALKYL OR PHENYL.
Claim 2
Dependent Claim
173 words
THE PROCESS OF SEPARATING FLUIDS USING A SEMIPERMEABLE MEMBRANE OF WHICH AT LEAST 50% BY WEIGHT CONSISTS ESSENTIALLY OF A POLYMER WHOSE MAIN CHAIN HAS A REPEATING UNIT CONTAINING AT LEAST ONE GROUP SELECED FROM THE GROUP CONSISTING OF AROMATIC IMIDE, AROMATIC ESTER AND AROMATIC AMIDE GROUPS, IN WHICH SAID REPEATING UNIT A. CONTAINS AT LEAST ONE RIGID DIVALENT SUBUNIT, THE TWO MAIN CHAIN SINGLE BONDS EXTENDING FROM WHICH ARE NOT COLINEAR, B. IS STERICALLY UNABLE TO ROTATE 360* AROUND ONE OR MORE OF SAID MAIN CHAIN SINGLE BONDS, AND C. HAS MORE THAN 50% OF ITS MAIN CHAIN ATOMS IN AROMATIC GROUPS, THE SAID AROMATIC IMIDE REPEATING UNIT HAVING THE FORMULA -R-N<(-CO-)2>R''<(-CO-)2>NWHEREIN R AND R1 ARE, REPSECTIVELY, A DIVALENT AND TETRAVALENT ORGANIC RADICAL, THE SAID AROMATIC ESTER REPEATING UNIT HAVING THE FORMULA -R2-OOC-R3-COOWHEREIN EACH OF R2 AND R3, ALIKE OR DIFFERENT, IS A DIVALENT ORGANIC RADICAL, AND THE SAID AROMATIC AMIDE REPEATING UNIT HAVING THE FORMULA -R-N(-R7)-CO-R3-CO-N(-R7)WHEREIN R AND R3 ARE AS DEFINED ABOVE AND R7 IS HYDROGEN, LOWER ALKYL OR PHENYL.
Claim 3
Dependent Claim
15 words
The process of separating fluids of claim 1 in which the polymer is a polyimide.
Claim 4
Dependent Claim
16 words
The process of separating fluids of claim 2 in which the polymer is polypyromellitimide of 4-isopropyl-1,3-diaminobenzene.
Claim 5
Dependent Claim
18 words
The process of separating fluids of claim 2 in which the polymer is poly(4,4''-(bis(trifluoromethyl)-methylene)dibenzene-1, 2,1'',2''-tetracarboxylic diimide) of 1,5-naphthylenediamine.
Claim 6
Dependent Claim
19 words
The process of separating fluids in claim 2 in which the polymer is poly(4,4''-(bis(trifluoromethyl)-methylene)dibenzene-1, 2,1'',2''-tetracarboxylic diimide) of 4,4''-diaminodiphenyl ether.
Claim 7
Dependent Claim
18 words
The process of separating fluids of claim 2 in which the polymer is poly(4,4''-(bis(trifluoromethyl)-methylene)dibenzene-1, 2,1''2''-tetracarboxylic diimide) of metaphenylenediamine.
Claim 8
Dependent Claim
18 words
The process of separating fluids of claim 2 in which the polymer is poly(4,4''-(bis(trifluoromethyl)-methylene)dibenzene-1, 2,1'',2''-tetracarboxylic diimide) of paraphenylenediamine.
Claim 9
Dependent Claim
15 words
The process of separating fluids of claim 1 in which the polymer is a polyester.
Claim 10
Dependent Claim
15 words
The process of separating fluids of claim 8 in which the polymer is poly(4,4''-(ditrifluoromethyl-methylene)dibenzene-1,1''-diyl) isophthalate/terephthalate.
Claim 11
Dependent Claim
15 words
The process of separating fluids of claim 8 in which the polymer is poly(4,4''-(ditrifluoromethylmethylene)di(2,6-dichlorobenzene)-1,1''-diyl) isophthalate/terephthalate.
Claim 12
Dependent Claim
15 words
The process of separating fluids of claim 8 in which the polymer is poly(4,4''-(ditrifluoromethylmethylene)di(2,6-dibromobenzene)-1,1''-diyl) isophthalate/terephthalate.
Claim 13
Dependent Claim
15 words
The process of separating fluids of claim 8 in which the polymer is poly(4,4''-(dimethylmethylene)di(2-chlorobenzene)-1,1''-diyl) isophthalate/terephthalate.
Claim 14
Dependent Claim
16 words
The process of separating fluids of claim 8 in which the polymer is poly(4,4''(dimethylmethylene)di(2,6-dichlorobenzene)-1, 1''-diyl) isophthalate/terephthalate.
Claim 15
Dependent Claim
15 words
The process of separating fluids of cLaim 1 in which the polymer is a polyamide.
Claim 16
Dependent Claim
15 words
The process of separating fluids of claim 14 in which the polymer is poly(4,4''-(bis(trifluoromethyl)methylene)di-p-phenylene) isophthalamide/terephthalamide.
Claim 17
Dependent Claim
15 words
The process of separating fluids of claim 14 in which the polymer is poly(4-isopropyl-m-phenylene) isophthalamide.
Claim 18
Dependent Claim
15 words
The process of separating fluids of claim 14 in which the polymer is poly(2,5,2'',5''-tetrachlorobiphenylene) isophthalamide.
Claim 19
Dependent Claim
15 words
The process of separating fluids of claim 14 in which the polymer is poly(1,5-naphthylene) isophthalamide/terephthalamide.
Claim 20
Dependent Claim
15 words
The process of separating fluids of claim 14 in which the polymer is poly(4,6-dichloro-m-phenylene) isophthalamide/terephthalamide.
Claim 21
Dependent Claim
15 words
The process of separating fluids of claim 14 in which the polymer is poly(2,6-dichloro-p-phenylene) isophthalamide/terephthalamide.
Claim 22
Dependent Claim
15 words
The process of separating fluids of claim 14 in which the polymer is poly((3,3''-dichlorobiphenylene)/(m-phenylene)) isophthalamide.
Claim 23
Dependent Claim
17 words
The process of separating fluids of claim 1 in which the fluid is a mixture of gases.
Claim 24
Dependent Claim
15 words
The process of separating fluids of claim 22 in which the polymer is a polyimide.
Claim 25
Dependent Claim
15 words
The process of separating fluids of claim 22 in which the polymer is a polyester.
Claim 26
Dependent Claim
15 words
The process of separating fluids of claim 22 in which the polymer is a polyamide.
Claim 27
Dependent Claim
135 words
A fluid-separation apparatus comprising: a fluid-permeation cell; a fluid inlet and a fluid outlet connected to said cell; and a semipermeable membrane dividing the cell between the inlet and the outlet; at least 50% by weight of said membrane consisting essentially of a polymer whose main chain has a repeating unit containing at least one group selected from the group consisting of aromatic imide, aromatic ester and aromatic amide groups, in which said repeating unit a. contains at least one rigid divalent subunit, the two main chain single bonds extending from which are not colinear, b. is sterically unable to rotate 360* around one or more of said main chain single bonds, and c. has more than 50% of its main chain atoms in aromatic groups, the said aromatic imide repeating unit having the formula
Claim 28
Dependent Claim
135 words
A fluid-separation apparatus comprising: a fluid-permeation cell; a fluid inlet and a fluid outlet connected to said cell; and a semipermeable membrane dividing the cell between the inlet and the outlet; at least 50% by weight of said membrane consisting essentially of a polymer whose main chain has a repeating unit containing at least one group selected from the group consisting of aromatic imide, aromatic ester and aromatic amide groups, in which said repeating unit a. contains at least one rigid divalent subunit, the two main chain single bonds extending from which are not colinear, b. is sterically unable to rotate 360* around one or more of said main chain single bonds, and c. has more than 50% of its main chain atoms in aromatic groups, the said aromatic imide repeating unit having the formula
Claim 29
Dependent Claim
13 words
The fluid-separation apparatus of claim 26 in which the polymer is a polyimide.
Claim 30
Dependent Claim
13 words
The fluid-separation apparatus of claim 26 in which the polymer is a polyester.
Claim 31
Dependent Claim
13 words
The fluid-separation apparatus of claim 26 in which the polymer is a polyamide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |