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US3917469A
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Method for the removal of sulfur dioxide from gas mixtures
Assignee: Union Carbide Corp
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Filing: 1974-07-24
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Granted: 1975-11-04
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Expires: 1994-07-24
Abstract
Abstract Sulfur dioxide can be removed from gas mixtures by adsorption on polymers containing pendant nitrogen containing moieties.
Inventors
- 👤 Robert J Cotter
- 👤 Michael J Keogh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:52
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60; Y; Y10; Y10S; Y10S95/00; Y10S95/90
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
35 words
METHOD FOR REMOVING SO2 FROM GAS MIXTURES CONTAINING MOISTURE WHICH COMPRISES CONTACTING SAID GAS MIXTURES AT A TEMPERATURE OF ABOUT 0* TO 90*C. WITH A NORMAL SOLID POLYMER HAVING REPEATING GROUPS REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
35 words
METHOD FOR REMOVING SO2 FROM GAS MIXTURES CONTAINING MOISTURE WHICH COMPRISES CONTACTING SAID GAS MIXTURES AT A TEMPERATURE OF ABOUT 0* TO 90*C. WITH A NORMAL SOLID POLYMER HAVING REPEATING GROUPS REPRESENTED BY THE FORMULA:
Claim 3
Dependent Claim
9 words
Method claimed in claim 1 wherein n is 0.
Claim 4
Dependent Claim
9 words
Method claimed in claim 1 wherein R'''' is hydrogen.
Claim 5
Dependent Claim
9 words
Method claimed in claim 1 wherein R'''' is phenyl.
Claim 6
Dependent Claim
10 words
Method claimed in claim 1 wherein Y is - N(R''OH)2.
Claim 7
Dependent Claim
9 words
Method claimed in claim 1 wherein Y is -NHR''OH.
Claim 8
Dependent Claim
8 words
Method claimed in claim 1 wherein Y is
Claim 9
Dependent Claim
8 words
Method claimed in claim 1 wherein Y is
Claim 10
Dependent Claim
12 words
Method claimed in claim 1 wherein the polymer is a particulate resin.
Claim 11
Dependent Claim
13 words
Method claimed in claim 1 wherein the polymer is deposited on a support.
Claim 12
Dependent Claim
12 words
Method claimed in claim 10 wherein the support is a cellulosic substance.
Claim 13
Dependent Claim
11 words
Method claimed in claim 10 wherein the support is a polyurethane.
Claim 14
Dependent Claim
10 words
Method claimed in claim 10 wherein the support is silica.
Claim 15
Dependent Claim
18 words
Method claimed in claim 1 wherein the gas mixture is ambient air containing about 0.01-0.2 ppm of SO2.
Claim 16
Dependent Claim
16 words
Method claimed in claim 1 wherein the normally solid polymer is crosslinked with a crosslinking agent.
Claim 17
Dependent Claim
11 words
Method claimed in claim 15 wherein the crosslinking agent is divinylbenzene.
References Cited (Backward Citations)
US3564818A
Cited
US3646594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |