US3350169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sulfuric acid
Assignee: Chemical Construction Corp
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Filing: 1965-10-21
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Granted: 1967-10-31
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Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 John B Rinckhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:28
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/765; C01B17/7655
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
220 words
A PROCESS FOR THE PRODUCTION OF SULFURIC ACID WHICH COMPRISES BURNING A SULFUR-CONTAINING FEED STREAM WITH AN OXYGEN-CONTAINING GAS, WHEREBY A HOT GAS STREAM CONTAINING LESS FROM ABOUT 14% BY VOLUME OF SULFUR DIOXIDE, AND EXCESS FREE OXYGEN, IS PRODUCED AT A TEMPERATURE BELOW 1200*C., COOLING SAID HOT GAS STREAM TO A TEMPERATURE IN THE RANGE OF 400* TO 550*C., DIVIDING SAID GAS STREAM INTO A FIRST PORTION AND A SECOND PORTION, PASSING SAID FIRST GAS STREAM PORTION THROUGH FIRST CATALYTIC CONVERSION MEANS FOR THE OXIDATION OF SULFUR DIOXIDE TO SULFUR TRIOXIDE, WHEREBY A MAJOR PART OF THE SULFUR DIOXIDE CONTENT OF SAID FIRST GAS STREAM PORTION IS CONVERTED TO SULFUR TRIOXIDE, SCRUBBING SAID FIRST GAS STREAM PORTION WITH CONCENTRATED LIQUID SULFURIC ACID IN FIRST ABSORPTION MEANS, WHEREBY SULFUR TRIOXIDE IS ABSORBED INTO THE LIQUID PHASE TO FORM FURTHER SULFURIC ACID, COMBINING THE RESIDUAL FIRST GAS STREAM PORTION WITH SAID SECOND GAS STREAM PORTION, PASSING THE COMBINED GAS STREAM THROUGH SECOND CATALYTIC CONVERSION MEANS FOR THE OXIDATION OF SULFUR DIOXIDE TO SULFUR TRIOXIDE, WHEREBY SUBSTANTIALLY ALL OF THE SULFUR DIOXIDE CONTENT OF SAID COMBINED GAS STREAM IS CONVERTED TO SULFUR TRIOXIDE, AND SCRUBBING SAID COMBINED GAS STREAM WITH CONCENTRATED LIQUID SULFURIC ACID IN SECOND ABSORPTION MEANS, WHEREBY SULFUR TRIOXIDE IS ABSORBED INTO THE LIQUID PHASE TO FORM FURTHER SULFURIC ACID.
Claim 2
Dependent Claim
220 words
A PROCESS FOR THE PRODUCTION OF SULFURIC ACID WHICH COMPRISES BURNING A SULFUR-CONTAINING FEED STREAM WITH AN OXYGEN-CONTAINING GAS, WHEREBY A HOT GAS STREAM CONTAINING LESS FROM ABOUT 14% BY VOLUME OF SULFUR DIOXIDE, AND EXCESS FREE OXYGEN, IS PRODUCED AT A TEMPERATURE BELOW 1200*C., COOLING SAID HOT GAS STREAM TO A TEMPERATURE IN THE RANGE OF 400* TO 550*C., DIVIDING SAID GAS STREAM INTO A FIRST PORTION AND A SECOND PORTION, PASSING SAID FIRST GAS STREAM PORTION THROUGH FIRST CATALYTIC CONVERSION MEANS FOR THE OXIDATION OF SULFUR DIOXIDE TO SULFUR TRIOXIDE, WHEREBY A MAJOR PART OF THE SULFUR DIOXIDE CONTENT OF SAID FIRST GAS STREAM PORTION IS CONVERTED TO SULFUR TRIOXIDE, SCRUBBING SAID FIRST GAS STREAM PORTION WITH CONCENTRATED LIQUID SULFURIC ACID IN FIRST ABSORPTION MEANS, WHEREBY SULFUR TRIOXIDE IS ABSORBED INTO THE LIQUID PHASE TO FORM FURTHER SULFURIC ACID, COMBINING THE RESIDUAL FIRST GAS STREAM PORTION WITH SAID SECOND GAS STREAM PORTION, PASSING THE COMBINED GAS STREAM THROUGH SECOND CATALYTIC CONVERSION MEANS FOR THE OXIDATION OF SULFUR DIOXIDE TO SULFUR TRIOXIDE, WHEREBY SUBSTANTIALLY ALL OF THE SULFUR DIOXIDE CONTENT OF SAID COMBINED GAS STREAM IS CONVERTED TO SULFUR TRIOXIDE, AND SCRUBBING SAID COMBINED GAS STREAM WITH CONCENTRATED LIQUID SULFURIC ACID IN SECOND ABSORPTION MEANS, WHEREBY SULFUR TRIOXIDE IS ABSORBED INTO THE LIQUID PHASE TO FORM FURTHER SULFURIC ACID.
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) | 1970-10-30 | 1971-05-01 | 1971-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-30 | 1975-05-01 | 1975-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-30 | 1979-05-01 | 1979-10-31 | $7700.00 | Window Closed / Lapsed |