US3876395A
Expired / Lapsed
US
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Method for the adsorption of sulfur dioxide
Assignee: Union Carbide Corp
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Filing: 1974-07-17
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Granted: 1975-04-08
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Expires: 1994-07-17
Abstract
Abstract Sulfur dioxide can be adsorbed from gas mixtures using crosslinked, water-insoluble polymers of N-glycidylpiperazine or Nglycidyl polyalkylpiperazines as the adsorbents.
Inventors
- 👤 Robert J Cotter
- 👤 Michael J Keogh
- 👤 William D Heitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:55
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60; B; B01; B01D; B01D53/00; B01D53/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
34 words
METHOD FOR REMOVING S02 FROM GAS MIXTURES CONTAINING MOISTURE WHICH COMPRISES CONTACTING SAID GAS MIXTURES WITH A CROSSLINKED, WATER-INSOLUBLE POLYMER OF N-GLYCIDYLPIPERAZINE OR N-GLYCIDYL POLYALKYLPIPERAZINES AT A TEMPERATURE OF ABOUT -10* TO ABOUT 110*C.
Claim 2
Dependent Claim
34 words
METHOD FOR REMOVING S02 FROM GAS MIXTURES CONTAINING MOISTURE WHICH COMPRISES CONTACTING SAID GAS MIXTURES WITH A CROSSLINKED, WATER-INSOLUBLE POLYMER OF N-GLYCIDYLPIPERAZINE OR N-GLYCIDYL POLYALKYLPIPERAZINES AT A TEMPERATURE OF ABOUT -10* TO ABOUT 110*C.
Claim 3
Dependent Claim
13 words
Method claimed in claim 1 wherein the polymer is a porous, particulate resin.
Claim 4
Dependent Claim
13 words
Method claimed in claim 1 wherein the polymer is deposited on a support.
Claim 5
Dependent Claim
12 words
Method claimed in claim 3 wherein the support is a cellulosic substance.
Claim 6
Dependent Claim
11 words
Method claimed in claim 3 wherein the support is a polyurethane.
Claim 7
Dependent Claim
17 words
Method claimed in claim 3 wherein the support is a mixture of poly(ethylene oxide) and wood flour.
Claim 8
Dependent Claim
10 words
Method claimed in claim 3 wherein the support is silica.
Claim 9
Dependent Claim
11 words
Method claimed in claim 3 wherein the support is glass fiber.
Claim 10
Dependent Claim
32 words
Method claimed in claim 1 wherein the temperature of the polymer is raised to about 60.degree. to about 160.degree.C. after adsorption of SO.sub.2 whereby the adsorbed SO.sub.2 is desorbed regenerating the polymer.
Claim 11
Dependent Claim
27 words
Method claimed in claim 1 wherein the polymer is treated with an inorganic base after adsorption of SO.sub.2 whereby the adsorbed SO.sub.2 is removed regenerating the polymer.
Claim 12
Dependent Claim
18 words
Method claimed in claim 1 wherein the gas mixture is ambient air containing about 0.01-0.2 ppm of SO.sub.2.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |