US3632314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration of sulfuric acid laden activated carbon
Assignee: Westvaco Corp
•
Filing: 1970-03-10
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Granted: 1972-01-04
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Expires: 1990-03-10
Abstract
Abstract A two-stage process for regenerating sulfuric acid laden activated carbon by contacting at a temperature below about 350* F. the activated carbon with hydrogen sulfide in an amount of at least 3:1 mole ratio of hydrogen sulfide to adsorbed sulfuric acid whereby the sulfuric acid is reduced to elemental sulfur which remains adsorbed on the activated carbon. The sulfur is then removed from the activated carbon in a second stage by contacting with a sulfur-reducing gas, such as hydrogen to produce a sufficient amount of hydrogen sulfide for use in the first step and the remaining sulfur is recovered.
Inventors
- 👤 Samuel L Torrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:31
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/48; C01B17/50; C01B17/60; C01B32/00; C01B32/30; C01B32/354; C01B32/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
The process of claim 1 wherein said carbonaceous adsorbent is a coal-based activated carbon.
Claim 2
Dependent Claim
11 words
The process of claim 1 wherein said sulfur-reducing gas is hydrogen.
References Cited (Backward Citations)
CA749940A
Cited
US1955722A
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US2123224A
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US2756127A
Cited
US2839365A
Cited
US3284158A
Cited
US3454354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |