US3726958A
Expired / Lapsed
US
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Reduction of so{11 {11 in gas mixtures
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-02-22
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Granted: 1973-04-10
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Expires: 1991-02-22
Abstract
Abstract A sulfur dioxide-rich off gas stream obtained, as for example, by regeneration of a flue gas desulfurization sorbent, is treated with a hydrocarbon oil in the liquid phase at a temperature of about 250 F. to about 800*F. in order to reduce the sulfur dioxide. The hydrocarbon oil is preferably an inexpensive refinery stream, e.g., gas oil, catalytic cycle stock, or residuum. Hydrogen sulfide formed in the reduction can be reacted with a further quantity of sulfur dioxide to form elemental sulfur. At least a portion of the hydrocarbon oil after reaction with sulfur dioxide may be burned in a furnace in which flue gas containing sulfur dioxide is formed.
Inventors
- 👤 E Holt
- 👤 A Welty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:46
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0473; C01B17/0478
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
23 words
A process according to claim 1 in which said liquid hydrocarbon fraction has an initial boiling point of not less than about 250*F.
Claim 2
Dependent Claim
16 words
A process according to claim 1 in which said sulfur dioxide is reduced to hydrogen sulfide.
Claim 3
Dependent Claim
14 words
A process according to claim 1 in which said catalyst is a solid catalyst.
Claim 4
Dependent Claim
12 words
A process according to claim 4 in which said catalyst comprises alumina.
Claim 5
Dependent Claim
16 words
A process according to claim 1 in which said SO2-rich off gas stream contains water vapor.
Claim 6
Dependent Claim
124 words
In a process for desulfurizing a flue gas in which a carbonaceous fuel containing suLfur is burned in a furnace, thereby producing a flue gas containing SO2 and in which said flue gas is desulfurized with the formation of a flue gas exit stream of substantially reduced SO2 content and an essentially oxygen-free SO2-rich off gas stream which contains water vapor and which has a substantially greater SO2 content than said flue gas stream, the improvement comprising contacting said SO2-rich and water vapor-containing off gas stream with a hydrocarbon oil in the liquid phase in a reduction zone at a temperature of about 250* to about 800*F., said hydrocarbon oil being a heavy hydrocarbon fraction at the reaction temperature, thereby reducing said sulfur dioxide.
Claim 7
Dependent Claim
23 words
A process according to claim 7 in which said off-gas stream is contacted with said hydrocarbon in the presence of a solid catalyst.
Claim 8
Dependent Claim
12 words
A process acording to claim 8 in wh1ch said catalyst is alumina.
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |