US3692480A
Expired / Lapsed
US
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Method for controlling a sulfur recovery process
Assignee: Shell USA Inc
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Filing: 1971-05-19
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Granted: 1972-09-19
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Expires: 1991-05-19
Abstract
Abstract A SULFUR RECOVERY PROCESS BASED ON THE REACTION OF HYDROGEN SULFIDE WITH SULFUR DIOXIDE WHEREIN AT LEAST PART OF THE SULFUR DIOXIDE IS DERIVED FROM THE REGENERATION WITH A REDUCING GAS OF A LOADED SOLID ACCEPTOR USED IN FLUE GAS DESULFURIZATION IS CONTROLLED BY MEASURING THE DIFFERENCE BETWEEN THE VOLUME OF REDUCING GAS USED IN REGENERATION AND THE VOLUME OF OFF-GAS OBTAINED FROM REGENERATION, AND EMPLOYING THIS DIFFERENCE TO CONTROL, EITHER DIRECTLY OR INDIRECTLY, THE COMPOSITON OF THE GAS MIXTURE TO THE SULFUR RECOVERY PROCESS.
Inventors
- 👤 Jacobus Snoek
- 👤 Jaap E Naber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:33
CPC Classifications
G; G05; G05D; G05D11/00; C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0452; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/0352; Y10T137/2496; Y10T137/2514; Y10T137/2521
Claims Analysis
Total Claims: 0
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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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |