US3781445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of sulphur
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-12-10
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Granted: 1973-12-25
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Expires: 1991-12-10
Abstract
Abstract TAIL GAS FROM A CLAUS UNIT IS CONTACTED WITH A BED OF FLUIDIZED SULPHUR REACTIVE MATERIAL SUCH AS LIME UNDER OXI DIZING CONDITIONS IN AN ABSORBER MIN ORDER TO REMOVE SULFUR COMPOUNDS THEREIN. ESSENTIALLY SULPHUR-FREE GAS IS DISCHARGED FROM THE ABSORBER. ABSORBER BED MATERIAL CONTAINING SULFATE (E.G., CASO4) IS TRANSFERRED TO A REGENERATOR WHERE THE CORRESPONDING OXIDE (E.G., CAO) IS REGENERATED UNDER REDUCING CONDITIONS.
Inventors
- 👤 G Moss
- 👤 D Rosborough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:13
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8603; B01D53/8612; B01D53/8615; C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0413
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |