US3615299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen production by reaction of carbon with steam or steam and oxygen
Assignee: Chevron USA Inc
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Filing: 1969-06-04
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Granted: 1971-10-26
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Expires: 1989-06-04
Abstract
Abstract Process for producing a hydrogen-rich gas mixture which is lean in CO and CH4 RELATIVE to CO2 by: A. CONTACTING SUBDIVIDED CARBONACEOUS MATTER WITH STEAM AND OXYGEN IN A REACTION ZONE AT TEMPERATURES BETWEEN ABOUT 800* AND 1,350* F. to form H2 and CO2, b. feeding sufficient steam to the reaction zone so that the hydrogen-rich gas mixture which is withdrawn from the reaction zone contains at least 60 volume percent steam, and C. WITHDRAWING THE HYDROGEN-RICH GAS MIXTURE FROM THE REACTION ZONE AT A TEMPERATURE BETWEEN 800* AND 1,250* F. The ratio of CO2 to CO and CO2 to CH4 in the hydrogen-rich gas withdrawn from the reaction zone is maintained above 2.5. According to a preferred embodiment only steam is used as an oxidizing source in the reaction zone.
Inventors
- 👤 Paul E Fischer
- 👤 Melvin M Holm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:57
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/46; C10J3/463; C10J2300/00; C10J2300/09; C10J2300/0903; C10J2300/0906; C10J2300/0909; C10J2300/0913; C10J2300/093; C10J2300/0933
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
26 words
A process in accordance with claim 1 wherein the hydrogen-rich gas mixture is withdrawn from the reaction zone at a temperature between 800* and 1,100* F.
Claim 2
Dependent Claim
32 words
A process in accordance with claim 1 wherein sufficient steam is fed to the reaction zone so that the hydrogen-rich gas mixture which is withdrawn contains at least 75 volume percent steam.
Claim 3
Dependent Claim
50 words
A process in accordance with Claim 1 wherein the amount of steam fed to the reaction zone is sufficient so that the ratio of CO2 to CH4 and the ratio of CO2 to CO in the hydrogen-rich gas mixture withdrawn from the reaction zone are each at least about 4.0.
Claim 4
Dependent Claim
26 words
A process in accordance with claim 4 wherein the hydrogen-rich gas mixture is withdrawn from the reaction zone at temperatures of between 800* and 1100* F.
Claim 5
Dependent Claim
38 words
A process in accordance with claim 1 wherein the contacting of the subdivided carbonaceous matter with steam and oxygen in the reaction zone is carried out in the presence of potassium carbonate catalyst added to the reaction zone.
Claim 6
Dependent Claim
130 words
A process for producing a hydrogen-rich gas mixture which is lean in CH4 and CO relative to CO2 and having a ratio of CO2 to CH4 in the hydrogen-rich gas mixture of at least 2.5 and a ratio of CO2 to CO of at least 2.5 which comprises: a. contacting subdivided carbonaceous matter with steam as the only oxidant in a reaction zone maintained at temperatures between about 800* and 1,350* F. to form a hydrogen-rich gas mixture comprised of H2 and CO2. b. feeding sufficient steam to the reaction zone so that the hydrogen-rich gas mixture which is withdrawn from the reaction zone contains at least 60 volume percent steam, and c. withdrawing the hydrogen-rich gas mixture from the reaction zone at a temperature between 800* and 1,250* F.
Claim 7
Dependent Claim
50 words
A process in accordance with claim 7 wherein the amount of steam fed to the reaction zone is sufficient so that the ratio of CO2 to CH4 and the ratio of CO2 to CO in the hydrogen-rich gas mixture withdrawn from the reaction zone are each at least about 4.0.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |