US3292996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovery of sulfur oxides and ammonia
Assignee: Davy McKee AG
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Filing: 1964-10-27
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Granted: 1966-12-20
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Expires: 1984-10-27
Abstract
No abstract record available.
Inventors
- 👤 Furkert Herbert
- 👤 Muhlenbein Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:54
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/10; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/58; C01C1/026; C01C1/028
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A METHOD OF RECOVERING SULFUR DIOXIDE AND AMMONIA FROM SOURCE MATERIAL SELECTED FROM THE GROUP CONSISTING OF AMMONIUM SALTS OF SULFURIC ACID, AND SOLUTIONS OF AMMONIUM SALTS OF SULFURIC ACID IN WATER, AND SOLUTIONS OF AMMONIUM SALTS OF SULFURIC ACID IN WATER CONTAINING EXCESS SULFURIC ACID, COMPRISING HEATING SAID SOURCE MATERIAL IN THE PRESENCE OF A REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, HYDROGEN SULFIDE, CARBON, SULFITE LIQUOR, CARBON MONOXIDE AND ORGANIC REDUCING AGENTS, AT A TEMPERATURE OF BETWEEN 250*C. AND 500*C., TO CONVERT ANY FREE SULFURIC ACID IN SAID SOURCE MATERIAL AND ALSO A PORTION OF THE SULFURIC ACID COMBINED IN THE FORM OF SAID AMMONIUM SALT OF SULFURIC ACID, INTO SULFUR DIOXIDE, WHEREBY THE REMAINING SULFUR AND AMMONIUM SALT MATERIALS ARE IN THE FORM OF A MIXTURE OF AMMONIUM SULFATE AND AMMONIUM BISULFATE, AND RECOVERING AMMONIUM FROM SAID MIXTURE.
Claim 2
Independent Claim
143 words
A METHOD OF RECOVERING SULFUR DIOXIDE AND AMMONIA FROM SOURCE MATERIAL SELECTED FROM THE GROUP CONSISTING OF AMMONIUM SALTS OF SULFURIC ACID, AND SOLUTIONS OF AMMONIUM SALTS OF SULFURIC ACID IN WATER, AND SOLUTIONS OF AMMONIUM SALTS OF SULFURIC ACID IN WATER CONTAINING EXCESS SULFURIC ACID, COMPRISING HEATING SAID SOURCE MATERIAL IN THE PRESENCE OF A REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, HYDROGEN SULFIDE, CARBON, SULFITE LIQUOR, CARBON MONOXIDE AND ORGANIC REDUCING AGENTS, AT A TEMPERATURE OF BETWEEN 250*C. AND 500*C., TO CONVERT ANY FREE SULFURIC ACID IN SAID SOURCE MATERIAL AND ALSO A PORTION OF THE SULFURIC ACID COMBINED IN THE FORM OF SAID AMMONIUM SALT OF SULFURIC ACID, INTO SULFUR DIOXIDE, WHEREBY THE REMAINING SULFUR AND AMMONIUM SALT MATERIALS ARE IN THE FORM OF A MIXTURE OF AMMONIUM SULFATE AND AMMONIUM BISULFATE, AND RECOVERING AMMONIUM FROM SAID MIXTURE.
References Cited (Backward Citations)
US2926070A
Cited
US2927001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |