Patent US4072479A successfully refreshed from Google Patents.
US4072479A
Expired / Lapsed
US
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Impregnated activated carbon for improved removal of malodorous compounds
Assignee: Calgon Carbon Corp
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Filing: 1976-12-20
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Granted: 1978-02-07
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Expires: 1996-12-20
Abstract
Abstract An improved process for the removal of malodorous compounds, especially sulfur-containing compounds, for example H2S and methyl mercaptan, from gas streams containing oxygen in which a bed of activated carbon treated with NaOH and moisture is used to remove said compounds. The treatment, which may also be combined with regeneration of the activated carbon, is effected, typically, by applying to the carbon one bed volume of dilute (4-6%) NaOH solution, draining and drying with 50- 100% R.H. air.
Inventors
- 👤 Rabindra Kumar Sinha
- 👤 Norman J. Wagner
- 👤 Ronald S. Joyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:04
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; Y; Y10; Y10S; Y10S95/00; Y10S95/90; Y10S95/901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
59 words
A process for removal of H 2 S and methyl mercaptan from gas streams containing oxygen, comprising contacting said gas stream with an activated carbon having impregnated therein from about 0.5 to about 20 percent by weight of NaOH, and from about 4 to about 50 percent by weight of moisture, both based on weight of dry activated carbon.
Claim 2
Dependent Claim
59 words
A process for removal of H 2 S and methyl mercaptan from gas streams containing oxygen, comprising contacting said gas stream with an activated carbon having impregnated therein from about 0.5 to about 20 percent by weight of NaOH, and from about 4 to about 50 percent by weight of moisture, both based on weight of dry activated carbon.
Claim 3
Dependent Claim
43 words
The process of claim 1 wherein the activated carbon has impregnated therein from about 5 to about 10 percent by weight of NaOH, and from about 10 to about 40 percent by weight of moisture, both based on weight of dry activated carbon.
Claim 4
Dependent Claim
48 words
The process of claim 1 comprising the additional step of using NaOH to regenerate the activated carbon used to adsorb H 2 S and methyl mercaptan under conditions sufficient to also subsequently impregnate the activated carbon with NaOH and moisture in the amounts set forth in claim 1.
Claim 5
Dependent Claim
48 words
An activated carbon for removal of H 2 S and methyl mercaptan, characterized by having impregnated therein from about 0.5 to about 20 percent by weight of NaOH, and from about 4 to about 50 percent by weight of moisture, both based on weight of dry activated carbon.
Claim 6
Dependent Claim
48 words
An activated carbon for removal of H 2 S and methyl mercaptan, characterized by having impregnated therein from about 0.5 to about 20 percent by weight of NaOH, and from about 4 to about 50 percent by weight of moisture, both based on weight of dry activated carbon.
Claim 7
Dependent Claim
42 words
The activated carbon of claim 4 characterized by having impregnated therein from about 5 to about 10 percent by weight of NaOH, and from about 10 to about 40 percent by weight of moisture, both based on weight of dry activated carbon.
References Cited (Backward Citations)
US3391988A
Cited
US3578390A
Cited
US3416293A
Cited
US3598521A
Cited
US3736726A
Cited
US3696629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |