US3142536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of sulphur trioxide
Assignee: Bayer AG
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Filing: 1961-09-13
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Granted: 1964-07-28
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Expires: 1981-09-13
Abstract
No abstract record available.
Inventors
- 👤 Guth Hans
- 👤 Heitmann Aloys
- 👤 Moller Wilhelm
- 👤 Werth Helmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:36
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
146 words
IN A PROCESS FOR THE PRODUCTION OF SULPHUR TRIOXIDE FROM AN SO2-CONTAINING GAS BY CATALYTIC OXIDATION IN SUCCESSIVE OXIDATION STAGES WITH INTERMEDIATE ABSORPTION BETWEEN TWO OF SAID SUCCESSIVE OXIDATION STAGES, THE IMPROVEMENT WHICH COMPRISES PASSING GAS FROM THE FIRST OF SAID TWO OXIDATION STAGES IN INDIRECT HEAT EXCHANGE RELATION WITH THE GAS FROM THE ABSORPTION TO HEAT THE GAS FROM THE ABSORPTION FOR INTRODUCTION INTO THE SECOND OF SAID TWO OXIDATION STAGES AND TO COOL THE GAS FROM THE FIRST OF SAID TWO OXIDATION STAGES FOR ABSORPTION, CONDUCTING THE ABSORPTION IN TWO ABSORPTION STATES, THE GAS BEING CONTACTED WITH OLEUM IN THE FIRST ABSORPTION STAGE AND WITH SULPHURIC ACID IN THE SECOND ABSORPTION STAGE, AND THE TEMPERATURE OF THE GAS FROM THE SECOND ABSORPTION STAGE BEING SUBSTANTIALLY IN EXCESS OF 70*C., THE GAS FROM THE SECOND ABSORPTION STAGE BEING PASSED IN SAID INDIRECT HEAT EXCHANGE RELATION.
Claim 2
Dependent Claim
146 words
IN A PROCESS FOR THE PRODUCTION OF SULPHUR TRIOXIDE FROM AN SO2-CONTAINING GAS BY CATALYTIC OXIDATION IN SUCCESSIVE OXIDATION STAGES WITH INTERMEDIATE ABSORPTION BETWEEN TWO OF SAID SUCCESSIVE OXIDATION STAGES, THE IMPROVEMENT WHICH COMPRISES PASSING GAS FROM THE FIRST OF SAID TWO OXIDATION STAGES IN INDIRECT HEAT EXCHANGE RELATION WITH THE GAS FROM THE ABSORPTION TO HEAT THE GAS FROM THE ABSORPTION FOR INTRODUCTION INTO THE SECOND OF SAID TWO OXIDATION STAGES AND TO COOL THE GAS FROM THE FIRST OF SAID TWO OXIDATION STAGES FOR ABSORPTION, CONDUCTING THE ABSORPTION IN TWO ABSORPTION STATES, THE GAS BEING CONTACTED WITH OLEUM IN THE FIRST ABSORPTION STAGE AND WITH SULPHURIC ACID IN THE SECOND ABSORPTION STAGE, AND THE TEMPERATURE OF THE GAS FROM THE SECOND ABSORPTION STAGE BEING SUBSTANTIALLY IN EXCESS OF 70*C., THE GAS FROM THE SECOND ABSORPTION STAGE BEING PASSED IN SAID INDIRECT HEAT EXCHANGE RELATION.
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) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |