US2676090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of sulfur dioxide contained in waste gases
Assignee: Texas Gulf Sulphur Co
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Filing: 1953-01-26
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Granted: 1954-04-20
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Expires: 1973-01-26
Abstract
No abstract record available.
Inventors
- 👤 Henry F Johnstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:36
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
197 words
A PROCESS FOR THE RECOVERY OF SULFUR DIOXIDE FROM WASTE GASES WHEREIN AQUEOUS AMMONIACAL SOLUTION IS DIRECTED INTO CONTACT WITH SAID GASES, SULFUR DIOXIDE CONTAINED IN SAID GASES IS ABSORBED BY SAID SOLUTION BY REACTION WITH AMMONIA CONTAINED THEREIN TO FORM AMMONIUM SULFITE COMPOUND DISSOLVED IN SAID SOLUTION AND EFFLUENT SOLUTION IS SEPARATED FROM SAID GASES WHICH COMPRISES THE STEPS OF REACTING A PORTION OF THE AMMONIUM SULFITE COMPOUND COMPRISED IN SAID EFFLUENT SOLUTION WITH SULFURIC ACID TO FORM AMMONIUM SULFATE AND SULFUR DIOXIDE BY ADDING SULFURIC ACID TO EFFLUENT SOLUTION CONTAINING SAID PORTION OF SAID AMMONIUM SULFITE COMPOUND, SEPARATING FROM THE SOLUTION SULFUR DIOXIDE SO FORMED LEAVING RESIDUAL SOLUTION CONTAINING AMMONIUM SULFATE, COLLECTING THE SEPARATED SULFUR DIOXIDE, CRYSTALLIZING AMMONIUM SULFATE FROM SAID RESIDUAL SOLUTION, COLLECTING AND RECOVERING SAID CRYSTALIZED AMMONIUM SULFATE, STRIPPING SULFUR DIOXIDE FROM A SECOND PORTION OF SAID AMMONIUM SULFITE COMPOUND COMPRISED IN SAID EFFLUENT SOLUTION BY HEATING EFFLUENT SOLUTION CONTAINING SAID SECOND PORTION OF SAID COMPOUND TO SEPARATE SULFUR DIOXIDE THEREFROM LEAVING RESIDUIAL AMMONIACAL SOLUTION, COLLECTING THE SO SEPARATED SULFUR DIOXIDE, AND RECYCLING SAID RESIDUAL AMMONIACAL SOLUTION SO AS TO BE COMPRISED IN SAID AMMONIACAL SOLUTION DIRECTED INTO CONTACT WITH SAID WASTE GASES.
Claim 2
Dependent Claim
197 words
A PROCESS FOR THE RECOVERY OF SULFUR DIOXIDE FROM WASTE GASES WHEREIN AQUEOUS AMMONIACAL SOLUTION IS DIRECTED INTO CONTACT WITH SAID GASES, SULFUR DIOXIDE CONTAINED IN SAID GASES IS ABSORBED BY SAID SOLUTION BY REACTION WITH AMMONIA CONTAINED THEREIN TO FORM AMMONIUM SULFITE COMPOUND DISSOLVED IN SAID SOLUTION AND EFFLUENT SOLUTION IS SEPARATED FROM SAID GASES WHICH COMPRISES THE STEPS OF REACTING A PORTION OF THE AMMONIUM SULFITE COMPOUND COMPRISED IN SAID EFFLUENT SOLUTION WITH SULFURIC ACID TO FORM AMMONIUM SULFATE AND SULFUR DIOXIDE BY ADDING SULFURIC ACID TO EFFLUENT SOLUTION CONTAINING SAID PORTION OF SAID AMMONIUM SULFITE COMPOUND, SEPARATING FROM THE SOLUTION SULFUR DIOXIDE SO FORMED LEAVING RESIDUAL SOLUTION CONTAINING AMMONIUM SULFATE, COLLECTING THE SEPARATED SULFUR DIOXIDE, CRYSTALLIZING AMMONIUM SULFATE FROM SAID RESIDUAL SOLUTION, COLLECTING AND RECOVERING SAID CRYSTALIZED AMMONIUM SULFATE, STRIPPING SULFUR DIOXIDE FROM A SECOND PORTION OF SAID AMMONIUM SULFITE COMPOUND COMPRISED IN SAID EFFLUENT SOLUTION BY HEATING EFFLUENT SOLUTION CONTAINING SAID SECOND PORTION OF SAID COMPOUND TO SEPARATE SULFUR DIOXIDE THEREFROM LEAVING RESIDUIAL AMMONIACAL SOLUTION, COLLECTING THE SO SEPARATED SULFUR DIOXIDE, AND RECYCLING SAID RESIDUAL AMMONIACAL SOLUTION SO AS TO BE COMPRISED IN SAID AMMONIACAL SOLUTION DIRECTED INTO CONTACT WITH SAID WASTE GASES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |