US4944775A
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Preparation of poly(phenylene oxide) asymmetric gas separation membranes
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1989-07-11
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Granted: 1990-07-31
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Expires: 2009-07-11
Abstract
Abstract A process for producing integrally-skinned asymmetric poly(phenylene oxide) gas separation membranes is disclosed. The process involves forming a solution of the poly(phenylene oxide) in an aprotic solvent at an elevated temperature, forming a nascent membrane from the solution, partially drying the nascent membrane, followed by coagulating the partially dried nascent membrane in a coagulation bath formed from a non-solvent for the poly(phenylene oxide) which non-solvent is miscible with the aprotic solvent.
Inventors
- 👤 Richard A. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:21
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/52; B01D71/522; B01D71/5223; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0016; B01D67/00165; B01D69/00; B01D69/02; B01D2323/00; B01D2323/08; B01D2323/081; B01D2323/12; B01D2323/40; B01D2325/00; B01D2325/02; B01D2325/022
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
107 words
A process for preparing an integrally-skinned asymmetric poly(phenylene oxide) gas separation membrane comprising, forming a solution of from 5 to 50 weight percent of film forming molecular weight poly(2,6-dimethylphenylene-1,4-oxide) in a solvent mixture comprising a main constituent of an aprotic solvent at from 50° C. to 200° C., forming said solution into a nascent membrane, partially drying said nascent membrane for 0.005 to 10 minutes at 20° C. to 200° C., and precipitating said nascent membrane in a coagulation bath at 0° C. to 80° C., said coagulation bath being a non-solvent for the poly(phenylene oxide) while being miscible with the main constituent of the solvent mixture.
Claim 2
Dependent Claim
107 words
A process for preparing an integrally-skinned asymmetric poly(phenylene oxide) gas separation membrane comprising, forming a solution of from 5 to 50 weight percent of film forming molecular weight poly(2,6-dimethylphenylene-1,4-oxide) in a solvent mixture comprising a main constituent of an aprotic solvent at from 50° C. to 200° C., forming said solution into a nascent membrane, partially drying said nascent membrane for 0.005 to 10 minutes at 20° C. to 200° C., and precipitating said nascent membrane in a coagulation bath at 0° C. to 80° C., said coagulation bath being a non-solvent for the poly(phenylene oxide) while being miscible with the main constituent of the solvent mixture.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the nascent membrane is dried at from 70° C. to 125° C.
Claim 4
Dependent Claim
21 words
The process of claim 2 wherein the poly(2,6-dimethylphenylene-1,4 oxide) is dissolved in the aprotic solvent at 70° C. to 125° C.
Claim 5
Dependent Claim
15 words
The process of claim 3 wherein the aprotic solvent is N-methylpyrrolidone, N,N-dimethylacetamide or mixtures thereof.
Claim 6
Dependent Claim
16 words
The process of claim 4 wherein the nascent membrane is dried from 0.05 to 5.0 minutes.
Claim 7
Dependent Claim
36 words
The process of claim 5 wherein the coagulation bath consists essentially of a lower alcohol containing from 1 to 10 carbon atoms, a lower ketone containing from 1 to 10 carbon atoms, water or mixtures thereof.
Claim 8
Dependent Claim
13 words
The process of claim 6 wherein the coagulation bath consists essentially of water.
Claim 9
Dependent Claim
20 words
The process of claim 3 wherein the aprotic solvent is a mixture of an aprotic solvent and an aromatic cosolvent.
Claim 10
Dependent Claim
16 words
The process of claim 8 wherein the aprotic solvent component is N-methylpyrrolidone, N,N-dimethylacetamide or mixtures thereof.
Claim 11
Dependent Claim
16 words
The process of claim 9 wherein the nascent membrane is dried from 0.05 to 5.0 minutes.
Claim 12
Dependent Claim
36 words
The process of claim 10 wherein the coagulation bath consists essentially of a lower alcohol containing from 1 to 10 carbon atoms, a lower ketone containing from 1 to 10 carbon atoms, water or mixtures thereof.
Claim 13
Dependent Claim
13 words
The process of claim 11 wherein the coagulation bath consists essentially of water.
Claim 14
Dependent Claim
15 words
The process of claim 8 wherein the aromatic cosolvent is toluene, xylene, or mixtures thereof.
Claim 15
Dependent Claim
16 words
The process of claim 13 wherein the nascent membrane is dried from 0.05 to 5.0 minutes.
Claim 16
Dependent Claim
36 words
The process of claim 14 wherein the coagulation bath consists essentially of a lower alcohol containing from 1 to 10 carbon atoms, a lower ketone containing from 1 to 10 carbon atoms, water or mixtures thereof.
Claim 17
Dependent Claim
13 words
The process of claim 15 wherein the coagulation bath consists essentially of water.
Claim 18
Dependent Claim
19 words
The process of claim 3 wherein the aprotic solvent is a mixture of an aprotic solvent and a nonsolvent.
Claim 19
Dependent Claim
16 words
The process of claim 17 wherein the aprotic solvent component is N-methylpyrrolidone, N,N-dimethylacetamide or mixtures thereof.
Claim 20
Dependent Claim
12 words
The process of claim 17 wherein the nonsolvent component is dipropylene glycol.
Claim 21
Dependent Claim
16 words
The process of claim 19 wherein the nascent membrane is dried from 0.05 to 5.0 minutes.
Claim 22
Dependent Claim
36 words
The process of claim 20 wherein the coagulation bath consists essentially of a lower alcohol containing from 1 to 10 carbon atoms, a lower ketone containing from 1 to 10 carbon atoms, water or mixtures thereof.
Claim 23
Dependent Claim
13 words
The process of claim 21 wherein the coagulation bath consists essentially of water.
Claim 24
Dependent Claim
16 words
The process of claim 1 wherein the nascent membrane is dried from 0.05 to 5.0 minutes.
Claim 25
Dependent Claim
36 words
The process of claim 23 wherein the coagulation bath consists essentially of a lower alcohol containing from 1 to 10 carbon atoms, a lower ketone containing from 1 to 10 carbon atoms, water or mixtures thereof.
Claim 26
Dependent Claim
13 words
The process of claim 24 wherein the coagulation bath consists essentially of water.
Claim 27
Dependent Claim
11 words
A gas separation membrane prepared by the process of claim 1.
Claim 28
Dependent Claim
49 words
A process for separating at least one gas from a gaseous mixture comprising bringing said gaseous mixture into contact with the gas separation membrane of claim 26 under conditions whereby one gas of said gaseous mixture permeates said membrane preferentially to at least one other gas of said mixture.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |