US4155715A
Expired / Lapsed
US
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Process for reducing the organic sulfur content of char
Assignee: Occidental Petroleum Corp
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Filing: 1977-09-06
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Granted: 1979-05-22
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Expires: 1997-09-06
Abstract
Abstract This invention covers an improved hydrodesulfurization process which significantly reduces the organic sulfur content of char by first magnetically or electrostatically removing iron sulfides and precursors of iron sulfides from char and then hydrodesulfurizing the remaining char.
Inventors
- 👤 Allan Sass
- 👤 Hans F. Bauer
- 👤 Norman W. Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:33
CPC Classifications
C; C10; C10L; C10L9/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
59 words
In a hydrodesulfurization process for reducing the organic sulfur content of char, the improvement comprising the steps of: (a) magnetically or electrostatically removing the sulfides of iron and the precursors thereof from char, said precursors including those which are not soluble in acid, and (b) hydrosulfurizing the remaining char with hydrogen gas to reduce the organic sulfur content thereof.
Claim 2
Dependent Claim
59 words
In a hydrodesulfurization process for reducing the organic sulfur content of char, the improvement comprising the steps of: (a) magnetically or electrostatically removing the sulfides of iron and the precursors thereof from char, said precursors including those which are not soluble in acid, and (b) hydrosulfurizing the remaining char with hydrogen gas to reduce the organic sulfur content thereof.
Claim 3
Dependent Claim
24 words
In a hydrodesulfurization process as set forth in claim 1 wherein said hydrogen contains up to about 1% by volume of hydrogen sulfide gas.
Claim 4
Dependent Claim
24 words
In a hydrodesulfurization process as set forth in claim 1 wherein said hydrogen contains up to about 5% by volume of hydrogen sulfide gas.
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) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |