US3780166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of catalytically reacting so2 to form so3 and of producing sulfuric acid
Assignee: GEA Group AG
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Filing: 1969-07-08
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Granted: 1973-12-18
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Expires: 1989-07-08
Abstract
Abstract A PROCESS OF CATALYTICALLY REACTING SO2-CONTAINING GAS TO FORM SO3 IN A CATALYTIC PLANT INCLUDING A PLURALITY OF CATALYST STAGES AND IN WHICH SO3 IS CONDENSED BETWEEN CATALYST STAGES FORMING SULFURIC ACID, CHARACTERIZED IN THAT: (A) THE SO3-CONTAINING GAS LEAVING THE FIRST OF TWO SUCCESSIVE STAGES IS TRANSFERRED ALONG A CLOSED FLOW PATH INTO THE SECOND OF SAID TWO STAGES; (B) A PARTIAL STREAM IS SEPARATED FROM SAID TRANSFERRED STREAM AND COOLED, AND SO3 IS CONDENSED FROM THE PARTIAL STREAM; (C) SAID PARTIAL STREAM FOLLOWING SAID CONDENSING IS COMBINED WITH THE BALANCE OF SAID TRANSFERRED STREAM AND AND THE COMBINED STREAM IS INTRODUCED INTO THE SECOND CATALYST STAGE.
Inventors
- 👤 H Drechsel
- 👤 K Dorr
- 👤 H Grimm
- 👤 G Rowedder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:15
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/765; C01B17/7655
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |