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US4072480A
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Dual impregnated activated carbon for improved removal of malodorous sulfur compounds
Assignee: Calgon Carbon Corp
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Filing: 1977-01-07
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Granted: 1978-02-07
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Expires: 1997-01-07
Abstract
Abstract An improved process for the removal of malodorous sulfur compounds, for example H2S and methyl mercaptan, from gas streams containing oxygen in which a bed of activated carbon treated with PbOAc, 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 and PbOAc solution, draining and drying with 50-100% R.H. air.
Inventors
- 👤 Norman J. Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:59
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
140 words
A process for removal of malodorous sulfur compounds from gas streams containing oxygen, said compounds being one or more members selected from the group consisting of H 2 S and mercaptans, which process comprises contacting said gas stream with an activated carbon having impregnated therein from about 0.5 to about 20 percent by weight of NaOH, from about 0.1 to about 5 percent by weight of PbOAc, and from about 4 to about 50 percent by weight of moisture, all based on weight of dry activated carbon. 2. The process of claim 1 wherein the activated carbon has impregnated therein from about 5 to about 10 percent by weight of NaOH, from about 0.5 to about 2 percent by weight of PbOAc, and from about 10 to about 40 percent by weight of moisture, all based on weight of dry
Claim 2
Dependent Claim
11 words
activated carbon. 3. The process of claim 1 wherein the malodorous
Claim 3
Dependent Claim
21 words
sulfur-containing compound removed in H 2 S. 4. The process of claim 1 wherein the malodorous sulfur-containing compounds removed are mercaptans.
Claim 4
Dependent Claim
11 words
. The process of claim 4 wherein the malodorous sulfur-containing compound
Claim 5
Dependent Claim
49 words
removed is methyl mercaptan. 6. An activated carbon for removal of malodorous sulfur compounds, characterized by having impregnated therein from about 0.5 to about 20 percent by weight of NaOH, from about 0.1 to about 5 percent by weight of PbOAc, and from about 10 to about 40 percent
Claim 6
Dependent Claim
49 words
removed is methyl mercaptan. 6. An activated carbon for removal of malodorous sulfur compounds, characterized by having impregnated therein from about 0.5 to about 20 percent by weight of NaOH, from about 0.1 to about 5 percent by weight of PbOAc, and from about 10 to about 40 percent
Claim 7
Dependent Claim
66 words
by weight of moisture all based on weight of dry activated carbon. 7. The activated carbon of claim 6 characterized by having impregnated therein from about 5 to about 10 percent by weight of NaOH, from about 0.5 to about 2 percent by weight of PbOAc, and from about 10 to about 40 percent by weight of moisture, all 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 |