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Patent US4427419A successfully refreshed from Google Patents.
US4427419A
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US
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Semipermeable membranes prepared from polymers containing pendent sulfone groups
Assignee: Standard Oil Co
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Filing: 1982-03-12
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Granted: 1984-01-24
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Expires: 2002-03-12
Abstract
Abstract Semipermeable membranes useful for separating gaseous mixtures of carbon dioxide and methane into enriched fractions of each are prepared from at least one polymer containing a preponderance of arylene units, such as polyxylene oxide, the arylene units containing pendent sulfone groups substituted with an aromatic group, such as phenyl.
Inventors
- 👤 George S. Li
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:04
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/66; B01D71/50; B01D71/52; B01D71/522; B01D71/5223; C; C07; C07C; C07C7/00; C07C7/144; Y; Y02; Y02C; Y02C20/00; Y02C20/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
134 words
A semipermeable membrane useful for separating a gaseous mixture of CO 2 and CH 4 into enriched fractions of each, the membrane formed from at least one polymer containing a preponderance of arylene units of the formula ##STR7## where each R is independently a C 1 -C 8 aliphatic or a C 5 -C 7 cycloaliphatic hydrocarbon radical, an aryl radical, an aralkyl radical or an alkaryl radical, each radical being free of a tertiary α-carbon atom; each Q is a radical of the formula ##STR8## where R' is a nonpolymeric aryl radical; X is a divalent oxygen or sulfur atom or a carbonate group; m is an integer of 0-2; and n is 0-1 with the proviso that n is 1 in at least 10 percent of the arylene units of the polymer.
Claim 2
Dependent Claim
134 words
A semipermeable membrane useful for separating a gaseous mixture of CO 2 and CH 4 into enriched fractions of each, the membrane formed from at least one polymer containing a preponderance of arylene units of the formula ##STR7## where each R is independently a C 1 -C 8 aliphatic or a C 5 -C 7 cycloaliphatic hydrocarbon radical, an aryl radical, an aralkyl radical or an alkaryl radical, each radical being free of a tertiary α-carbon atom; each Q is a radical of the formula ##STR8## where R' is a nonpolymeric aryl radical; X is a divalent oxygen or sulfur atom or a carbonate group; m is an integer of 0-2; and n is 0-1 with the proviso that n is 1 in at least 10 percent of the arylene units of the polymer.
Claim 3
Dependent Claim
34 words
The membrane of claim 1 where R' is an aryl radical of the formula ##STR9## where each R" is independently a C 1 -C 6 aliphatic radical, and p is an integer of 0-4.
Claim 4
Dependent Claim
19 words
The membrane of claim 2 where R' is selected from the group consisting of phenyl, tolyl, xyleneyl and phenethyl.
Claim 5
Dependent Claim
19 words
The membrane of claim 3 wherein n=1 in at least 20 percent of the arylene units of the polymer.
Claim 6
Dependent Claim
12 words
The membrane of claim 4 where x is a divalent oxygen atom.
Claim 7
Dependent Claim
17 words
The membrane of claim 5 where each R is independently a C 1 -C 4 alkyl radical.
Claim 8
Dependent Claim
9 words
The membrane of claim 5 where m is 0.
Claim 9
Dependent Claim
24 words
The membrane of claim 7 where at least one of the polymers used to form the membrane consists essentially of repeating units of I.
Claim 10
Dependent Claim
18 words
The membrane of claim 8 formed from essentially only the polymer consisting essentially of repeating units of I.
Claim 11
Dependent Claim
65 words
A process of separating a gaseous mixture of CO 2 and CH 4 into enriched fractions of each, the process comprising contacting the mixture with one side of the membrane of claim 1 in such a manner that the CO 2 portion of the mixture is selectively passed through the membrane while the CH 4 portion of the mixture is selectively rejected by the membrane.
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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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |