Patent US3769775B1 successfully refreshed from Google Patents.
US3931389A
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Process of desulfurizing hot gases
Assignee: GEA Group AG
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Filing: 1974-10-23
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Granted: 1976-01-06
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Expires: 1994-10-23
Abstract
Abstract Gases produced by reacting fuels with oxygen containing gases and water vapor under pressure are desulfurized by scrubbing with a concentrated solution of one or more alkali salts of weak inorganic acids at a temperature near the atmospheric-pressure boiling point of the solution in a column while maintaining an exchange ratio of from 0.2 to 2.0 cubic meters of the concentrated solution per standard cubic meter hydrogen sulfide in the gas to be purified.
Inventors
- 👤 Karl Bratzler
- 👤 Alexander Dorges
- 👤 Georg Kempf
- 👤 Paul Rudolph
- 👤 Johann Schlauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:56
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/08; C10K1/10; C10K1/12; C10K1/122; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
Process for desulfurizing hot raw gas produced by the gasification of coal with oxygen-containing gases and water vapor under pressure which comprises: a. cooling said raw gas in at least two stages, in the last cooling stage before the desulfurizing step, cooling said raw gas by indirect heat exchange to a temperature below the temperature of the desulfurizing step and removing condensate; b. in a subsequent stage raising the temperature of the raw gas to the temperature of the desulfurizing step and introducing said raw gas into a desulfurizing stage where it is treated with a hot solution of one or more alkali salts of weak inorganic acids to selectively remove the sulfur compounds from the gas; and c. regenerating the laden desulfurizing solution and recycling it to the desulfurizing stage.
Claim 2
Dependent Claim
131 words
Process for desulfurizing hot raw gas produced by the gasification of coal with oxygen-containing gases and water vapor under pressure which comprises: a. cooling said raw gas in at least two stages, in the last cooling stage before the desulfurizing step, cooling said raw gas by indirect heat exchange to a temperature below the temperature of the desulfurizing step and removing condensate; b. in a subsequent stage raising the temperature of the raw gas to the temperature of the desulfurizing step and introducing said raw gas into a desulfurizing stage where it is treated with a hot solution of one or more alkali salts of weak inorganic acids to selectively remove the sulfur compounds from the gas; and c. regenerating the laden desulfurizing solution and recycling it to the desulfurizing stage.
Claim 3
Dependent Claim
43 words
Process of claim 1 wherein the temperature is raised in said subsequent stage by directly contacting said gas with a recirculated hot aqueous solution of alkali salts of weak inorganic acids, said solution also prescrubbing and saturating said raw gas with water vapor.
Claim 4
Dependent Claim
17 words
Process of claim 1 wherein the raw gas is desulfurized at temperatures of about 105° to 115°C.
Claim 5
Dependent Claim
48 words
Process of claim 1 wherein said raw gas is precooled to 200°-150°C and subsequently indirectly cooled to a temperature which is a few degrees below the operating temperature of the desulfurizing step, then the temperature of the raw gas is raised in a prescrubbing stage and thereafter desulfurized.
Claim 6
Dependent Claim
12 words
Process of claim 2 wherein the hot aqueous solution contains sodium carbonate.
Claim 7
Dependent Claim
25 words
Process of claim 1 wherein subsequent indirect cooling is carried out in a plurality of stages and pre-cooling is carried out with water under pressure.
Claim 8
Dependent Claim
28 words
Process of claim 6 wherein one subsequent indirect cooling stage involves a heat exchange between the gas and the absorbent solution laden with sulfur compounds prior to regeneration.
Claim 9
Dependent Claim
33 words
Process of claim 7 wherein water drained from the first subsequent indirect cooling stage is cooled by a direct contact with the desulfurized gas and is recycled to the first indirect cooling stage.
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) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |