Patent US5456899A successfully refreshed from Google Patents.
Patent US4334977A successfully refreshed from Google Patents.
US4334977A
Expired / Lapsed
US
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Method for the generation of recycle solvents in coal liquefaction
Assignee: Mobil Oil AS
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Filing: 1981-01-15
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Granted: 1982-06-15
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Expires: 2001-01-15
Abstract
Abstract A method is described to improve a coal liquefaction process by the use of a recycle solvent comprised of two fractions: the first, a lower boiling fraction, is obtained by an atmospheric distillation and is subsequently hydrotreated to enrich its hydrogen donor capacity; the second is a higher boiling fraction that is enriched in desirable hydrogen transfer agents by a solvent extraction process. The combined recycle solvent thus obtained is more efficient in transferring gas phase H2 to the coal and enables other significant process improvements.
Inventors
- 👤 Francis J. Derbyshire
- 👤 Philip Varghese
- 👤 Darrell D. Whitehurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:57
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/006; C10G1/04; C10G1/042; Y; Y10; Y10S; Y10S208/00; Y10S208/952
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
A process for the liquefaction of solid carbonaceous material which comprises: (a) forming a slurry of the solid carbonaceous material in a recycle liquefaction solvent; (b) heating said slurry in the presence of hydrogen at a temperature and pressure sufficient to obtain a conversion of said solid carbonaceous material to at least 60% of soluble product; (c) distilling the converted mixture of solid carbonaceous material and recycle solvent to recover a light fraction comprising gases and light liquids boiling below 250° to 400° F., a middle distillate fraction boiling below 600° to 700° F. and a heavy bottoms fraction; (d) hydrotreating at least a portion of the middle distillate fraction and recovering recycle hydrogen donor solvent; (e) extracting the heavy bottoms fraction with naphtha containing from about 10 to 50 wt.% aromatics; (f) separating from said naphtha the components soluble therein as a recycle hydrogen transfer solvent; and (g) combining said recycle hydrogen donor solvent and said recycle hydrogen transfer solvent to form said recycle solvent recited in step (a).
Claim 2
Dependent Claim
170 words
A process for the liquefaction of solid carbonaceous material which comprises: (a) forming a slurry of the solid carbonaceous material in a recycle liquefaction solvent; (b) heating said slurry in the presence of hydrogen at a temperature and pressure sufficient to obtain a conversion of said solid carbonaceous material to at least 60% of soluble product; (c) distilling the converted mixture of solid carbonaceous material and recycle solvent to recover a light fraction comprising gases and light liquids boiling below 250° to 400° F., a middle distillate fraction boiling below 600° to 700° F. and a heavy bottoms fraction; (d) hydrotreating at least a portion of the middle distillate fraction and recovering recycle hydrogen donor solvent; (e) extracting the heavy bottoms fraction with naphtha containing from about 10 to 50 wt.% aromatics; (f) separating from said naphtha the components soluble therein as a recycle hydrogen transfer solvent; and (g) combining said recycle hydrogen donor solvent and said recycle hydrogen transfer solvent to form said recycle solvent recited in step (a).
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein said recycle solvent contains from about 5 to 70 wt.% of said recycle hydrogen donor solvent.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein said converted mixtures of solid carbonaceous material is distilled at substantially atmospheric pressure.
Claim 5
Dependent Claim
152 words
In a process for the liquefaction of solid carbonaceous material wherein a slurry of solid carbonaceous material in a recycle liquefaction solvent is heated in the presence of hydrogen under liquefaction conditions sufficient to obtain a conversion of solid carbonaceous material to at least 60% of soluble product in the resulting digested mixture. The improvement which comprises providing a recycle solvent containing two components: (a) a hydrogen donor solvent component is provided by hydrotreating a fraction of said digested mixture having an initial boiling point of about 250° to 400° F. and a final boiling point of about 600° to 700° F., and (b) a hydrogen transfer solvent component which transfer component is provided by extracting a heavy fraction of said digested mixture boiling above about 600° to 700° F. with a naphtha extraction solvent containing from about 10 to 50 wt.% aromatics and recovering the naphtha-soluble components of said heavy fraction.
Claim 6
Dependent Claim
152 words
In a process for the liquefaction of solid carbonaceous material wherein a slurry of solid carbonaceous material in a recycle liquefaction solvent is heated in the presence of hydrogen under liquefaction conditions sufficient to obtain a conversion of solid carbonaceous material to at least 60% of soluble product in the resulting digested mixture. The improvement which comprises providing a recycle solvent containing two components: (a) a hydrogen donor solvent component is provided by hydrotreating a fraction of said digested mixture having an initial boiling point of about 250° to 400° F. and a final boiling point of about 600° to 700° F., and (b) a hydrogen transfer solvent component which transfer component is provided by extracting a heavy fraction of said digested mixture boiling above about 600° to 700° F. with a naphtha extraction solvent containing from about 10 to 50 wt.% aromatics and recovering the naphtha-soluble components of said heavy fraction.
Claim 7
Dependent Claim
22 words
The method of claim 4 wherein said recycle solvent contains from about 5 to 70 wt.% of the hydrogen donor solvent component.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |