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US4508543A
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Process for the catalytic gasification of solid fluids with steam
Assignee: Kraftwerk Union AG
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Filing: 1979-04-13
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Granted: 1985-04-02
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Expires: 1999-04-13
Abstract
Abstract Disclosed is a process for gasifying solid carbon fuels with steam. After forming a supersaturated solution of catalyst in steam the pressure is reduced to reaction pressure.
Inventors
- 👤 Siegfried Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:35
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/72; C10J3/78; C10J3/74; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/093; C10J2300/0943; C10J2300/0946; C10J2300/0953; C10J2300/0973; C10J2300/0979; C10J2300/0983; C10J2300/0986; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/54
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
In a process of a catalytic gasification of solid carbon fuels with steam employing steam volatile catalysts at high temperature and pressure, the improvement which comprises the steps of: 1. forming a supersaturated solution of the catalyst in steam under supercritical conditions of temperature and pressure; 2. reducing the pressure to a value below supercritical; and 3. contacting resulting catalyst containing steam with the carbon fuel to be gasified thereby accelerating the reaction between the coal and steam.
Claim 2
Dependent Claim
78 words
In a process of a catalytic gasification of solid carbon fuels with steam employing steam volatile catalysts at high temperature and pressure, the improvement which comprises the steps of: 1. forming a supersaturated solution of the catalyst in steam under supercritical conditions of temperature and pressure; 2. reducing the pressure to a value below supercritical; and 3. contacting resulting catalyst containing steam with the carbon fuel to be gasified thereby accelerating the reaction between the coal and steam.
Claim 3
Dependent Claim
42 words
A process as in claim 1 in which the supersaturated solution is formed in a first stream of steam and the pressure is reduced by mixing the first stream with a second stream of steam which is maintained at a lower pressure.
Claim 4
Dependent Claim
28 words
A process as in claim 1 in which the supersaturated solution is formed at a temperature from 2° C. to 100° C. above the critical temperature of steam.
Claim 5
Dependent Claim
32 words
A process according to any one of claims 1 through 3 in which the concentration of the catalyst in the steam is from 0.001 to 0.5 mole per 1,000 grams of steam.
Claim 6
Dependent Claim
28 words
The process according to any one of claims 1 to 3 wherein carbonates, halides, borates, tetraborates, and hydroxides of alkali metals or mixtures thereof are used as catalysts.
Claim 7
Dependent Claim
24 words
The process according to any one of claims 1 to 3 wherein carbonates, halides, borates, tetraborates, and hydroxides of potassium are used as catalysts.
Claim 8
Dependent Claim
24 words
The process according to any one of claims 1 to 3 wherein carbonates, halides, borates, tetraborates, and hydroxides of sodium are used as catalysts.
Claim 9
Dependent Claim
24 words
The process according to any one of claims 1 to 3 wherein carbonates, halides, borates, tetraborates, and hydroxides of lithium are used as catalysts.
Claim 10
Dependent Claim
23 words
The process according to any one of claims 1 to 3 wherein mixtures of lithium chloride and potassium chloride are used as catalysts.
Claim 11
Dependent Claim
26 words
The process according to any one of claims 1 to 3 wherein mixtures of sodium borate or sodium tetraborate and potassium chloride are used as catalysts.
Claim 12
Dependent Claim
23 words
The process according to any one of claims 1 to 3 wherein mixtures of sodium carbonate and potassium chloride are used as catalysts.
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) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |