US4238922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of power from crude fuels containing high concentrations of sulfur
Assignee: US Filter Zimpro Inc
•
Filing: 1979-05-11
•
Granted: 1980-12-16
•
Expires: 1999-05-11
Abstract
Abstract A sulfur bearing fuel is wet oxidized in the presence of an alkaline earth metal carbonate, of which the corresponding sulfate is insoluble. Ash and sulfate salt blown down from the wet oxidation are reacted at high temperature with another portion of the same or a different fuel to reduce the sulfate to sulfide. Carbonation of an aqueous dispersion of the sulfide releases hydrogen sulfide which is converted to elemental sulfur. Carbonate precipitates and is recycled.
Inventors
- 👤 Wayne B. Gitchel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:16
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/02; C10G; C10G27/00; C10G27/04; C10G27/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
113 words
A process for the production of power from a crude sulfur bearing fuel which comprises subjecting the crude sulfur bearing fuel to wet oxidation in the presence of an alkaline earth metal carbonate, utilizing the steam and compressed gases from the wet oxidation in power production, separating insoluble ash and sulfate salt from the wet oxidation reactor blowdown, mixing the ash and sulfate salt with a portion of the same or a different fuel, reacting the mixture at a high temperature under reducing conditions to produce the corresponding alkaline earth metal sulfide, and treating the alkaline earth metal sulfide with water and carbon dioxide to regenerate alkaline earth carbonate and release hydrogen sulfide.
Claim 2
Dependent Claim
113 words
A process for the production of power from a crude sulfur bearing fuel which comprises subjecting the crude sulfur bearing fuel to wet oxidation in the presence of an alkaline earth metal carbonate, utilizing the steam and compressed gases from the wet oxidation in power production, separating insoluble ash and sulfate salt from the wet oxidation reactor blowdown, mixing the ash and sulfate salt with a portion of the same or a different fuel, reacting the mixture at a high temperature under reducing conditions to produce the corresponding alkaline earth metal sulfide, and treating the alkaline earth metal sulfide with water and carbon dioxide to regenerate alkaline earth carbonate and release hydrogen sulfide.
Claim 3
Dependent Claim
16 words
A process according to claim 1 in which the alkaline earth metal carbonate is calcium carbonate.
Claim 4
Dependent Claim
16 words
A process according to claim 1 in which the alkaline earth metal carbonate is barium carbonate.
Claim 5
Dependent Claim
25 words
A process according to claim 1 in which the fuel used in wet oxidation and in reduction is a coal containing more than 1% sulfur.
Claim 6
Dependent Claim
26 words
A process according to claim 1 in which the fuel used in wet oxidation and in reduction is a petroleum oil containing more than 1% sulfur.
Claim 7
Dependent Claim
28 words
A process according to claim 1 in which the fuel used in wet oxidation contains more than 1% sulfur and the fuel used in reduction is sulfur free.
Claim 8
Dependent Claim
28 words
A process according to claim 1 in which the fuel used in wet oxidation contains more than 1% sulfur and the fuel used in reduction is municipal refuse.
Claim 9
Dependent Claim
16 words
A process according to claim 1 in which released hydrogen sulfide is converted to elementary sulfur.
Claim 10
Dependent Claim
32 words
A process according to claim 1 in which effluent gases from the reduction stage are used to provide carbon dioxide for conversion of alkaline earth metal sulfide to alkaline earth metal carbonate.
Claim 11
Dependent Claim
29 words
A process according to claim 1 in which the wet oxidation feed slurry of alkaline earth metal carbonate and fuel is used as a medium to scrub effluent gases.
Claim 12
Dependent Claim
98 words
A method according to claim 2 wherein up to 90% of the calcium carbonate used in the wet oxidation stage is recovered by reducing the calcium sulfate formed in the wet oxidation stage to calcium sulfide, suspending the sulfide in water, introducing sufficient carbon dioxide to create a hydrogen sulfide pressure of 10-100 mm Hg, dissolving the resulting calcium hydrosulfide at about 10-20% by weight, filtering precipitated calcium carbonate and ash, treating the hydrosulfide extract with carbon dioxide to precipitate pure calcium carbonate, and recycling all of the pure calcium carbonate plus 80% of the calcium carbonate-ash mixture.
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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |