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US4053285A
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Process for reducing the sulfide sulfur content of char with carbon dioxide and H2 O
Assignee: Occidental Research Corp
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Filing: 1976-01-15
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Granted: 1977-10-11
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Expires: 1996-01-15
Abstract
Abstract This invention covers a process for reducing the sulfide sulfur content of char by treatment with a gaseous mixture of carbon dioxide and H 2 O.
Inventors
- 👤 Leon Robinson
- 👤 Allan Sass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:23
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
40 words
In a method for reducing the sulfide sulfur content of char, the step comprising treating said char with a gaseous mixture of carbon dioxide and H 2 O at a temperature of from about 500° F. to about 1600° F.
Claim 2
Dependent Claim
40 words
In a method for reducing the sulfide sulfur content of char, the step comprising treating said char with a gaseous mixture of carbon dioxide and H 2 O at a temperature of from about 500° F. to about 1600° F.
Claim 3
Dependent Claim
29 words
In a method as set forth in claim 1, wherein said gaseous mixture has a ratio of carbon dioxide to H 2 O of about 1:5 to about 5:1.
Claim 4
Dependent Claim
70 words
In a method as set forth in claim 1, wherein said gaseous mixture has a ratio of carbon dioxide to H 2 O of about 1:5 to about 5:1, a flow rate of about 5 to about 100 standard cubic feet per pound of char and a pressure from about atmospheric to about 500 psia, said char being treated with said mixture for about 5 minutes to about 2 hours.
Claim 5
Dependent Claim
62 words
In a method as set forth in claim 1, wherein said gaseous mixture has a ratio of carbon dioxide to H 2 O of about 1:1, a flow rate of about 25 standard cubic feet per pound of char, a temperature of about 1000° F., a pressure of about 50 psia, said char being treated with said mixture for about 30 minutes.
Claim 6
Dependent Claim
51 words
In a method for reducing the sulfide sulfur content of char, wherein said char has been partially desulfurized by treatment with hydrogen gas, the step comprising treating said char with a gaseous mixture of carbon dioxide and H 2 O at a temperature from about 500° F. to about 1600° F.
Claim 7
Dependent Claim
51 words
In a method for reducing the sulfide sulfur content of char, wherein said char has been partially desulfurized by treatment with hydrogen gas, the step comprising treating said char with a gaseous mixture of carbon dioxide and H 2 O at a temperature from about 500° F. to about 1600° F.
Claim 8
Dependent Claim
29 words
In a method as set forth in claim 5, wherein said gaseous mixture has a ratio of carbon dioxide to H 2 O of about 1:5 to about 5:1.
Claim 9
Dependent Claim
80 words
In a method as set forth in claim 5, wherein said gaseous mixture has a ratio of carbon dioxide to H 2 O of about 1:5 to about 5:1, a flow rate of about 5 to about 100 standard cubic feet per pound of char, a temperature from about 700° F. to about 1200° F., and a pressure from about atmospheric to about 500 psia, said char being treated with said mixture for about 5 minutes to about 2 hours.
Claim 10
Dependent Claim
62 words
In a method as set forth in claim 5, wherein said gaseous mixture has a ratio of carbon dioxide to H 2 O of about 1:1, a flow rate of about 25 standard cubic feet per pound of char, a temperature of about 1000° F., a pressure of about 50 psia, said char being treated with said mixture for about 30 minutes.
Claim 11
Dependent Claim
45 words
A process for reducing the sulfide sulfur content of char comprising treating said char simultaneously with carbon dioxide and H 2 O at a temperature below the temperature at which appreciable H 2 O -- carbon reaction occurs and carbon dioxide -- carbon reaction occurs.
Claim 12
Dependent Claim
45 words
A process for reducing the sulfide sulfur content of char comprising treating said char simultaneously with carbon dioxide and H 2 O at a temperature below the temperature at which appreciable H 2 O -- carbon reaction occurs and carbon dioxide -- carbon reaction occurs.
Claim 13
Dependent Claim
72 words
A process for reducing the sulfur content of char comprising: a. heating said char at a temperature and for a period of time sufficient to convert a portion of the sulfur content of said char to sulfide sulfur; and b. treating said char simultaneously with carbon dioxide and steam at a temperature below the temperature at which appreciable H 2 O -- carbon reaction occurs and carbon dioxide -- carbon reaction occurs.
Claim 14
Dependent Claim
72 words
A process for reducing the sulfur content of char comprising: a. heating said char at a temperature and for a period of time sufficient to convert a portion of the sulfur content of said char to sulfide sulfur; and b. treating said char simultaneously with carbon dioxide and steam at a temperature below the temperature at which appreciable H 2 O -- carbon reaction occurs and carbon dioxide -- carbon reaction occurs.
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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |