US4051012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal liquefaction process
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1976-05-17
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Granted: 1977-09-27
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Expires: 1996-05-17
Abstract
Abstract A process for liquefying a particulate coal feed to produce useful petroleum-like liquid products by steps which include: (a) contacting, in a liquefaction zone, said coal feed with a hydrogen donor solvent at temperature and pressure sufficient to hydroconvert and liquefy the coal, (b) separating the product from the liquefaction zone by distillation into fractions inclusive of a liquid solvent fraction which contains at least 30 weight percent, and preferably at least 50 weight percent hydrogen donor compounds, particularly those fractions boiling within about the 350°-850° F. range, and preferably within about the 400°-700° F. range, (c) hydrotreating said liquid solvent fraction in a hydrogenation zone in the presence of a quinone catalyst, and (d) recycling the hydrogenated liquid solvent mixture to said coal liquefaction zone.
Inventors
- 👤 Karl W. Plumlee
- 👤 Lonnie W. Vernon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:54
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/06; C10G1/065; C10G1/04; C10G1/042; C10G45/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
98 words
A process for liquefying a particulate coal feed to produce useful petroluem-like liquid products, which comprises: (a) contacting, in a liquefaction zone, said coal feed with a hydrogen donor solvent at temperature and pressure sufficient to hydroconvert and liquefy the coal, (b) separating the product from the liquefaction zone into fractions inclusive of a liquid solvent fraction which contains at least 30 weight percent hydrogen donor compounds, (c) hydrogenating said liquid solvent fraction in a hydrogenation zone in the presence of an added quinone, compound and (d) recycling the hydrogenated liquid solvent mixture to said coal liquefaction zone.
Claim 2
Dependent Claim
98 words
A process for liquefying a particulate coal feed to produce useful petroluem-like liquid products, which comprises: (a) contacting, in a liquefaction zone, said coal feed with a hydrogen donor solvent at temperature and pressure sufficient to hydroconvert and liquefy the coal, (b) separating the product from the liquefaction zone into fractions inclusive of a liquid solvent fraction which contains at least 30 weight percent hydrogen donor compounds, (c) hydrogenating said liquid solvent fraction in a hydrogenation zone in the presence of an added quinone, compound and (d) recycling the hydrogenated liquid solvent mixture to said coal liquefaction zone.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the liquid solvent fraction contains at least 50 weight percent of hydrogen donor compounds.
Claim 4
Dependent Claim
22 words
The process of claim 2 wherein the liquid solvent fraction is one boiling within about a 350° F. to 850° F. range.
Claim 5
Dependent Claim
31 words
The process of claim 1 wherein the quinone compound is added to the solvent in concentration ranging from about 0.01 to about 5 percent, based on the weight of the feed.
Claim 6
Dependent Claim
20 words
The process of claim 4 wherein the concentration of the quinone compound ranges from about 0.1 to about 2 percent.
Claim 7
Dependent Claim
20 words
The process of claim 1 wherein the liquid solvent fraction, after hydrogenation, contains at least about 0.8 percent donatable hydrogen.
Claim 8
Dependent Claim
23 words
The process of claim 6 wherein the liquid solvent fraction, after hydrogenation, contains from about 1.2 to about 3 percent of donated hydrogen.
Claim 9
Dependent Claim
22 words
The process of claim 1 wherein the liquid solvent fraction is one boiling within about a 350° F to 850° F range.
Claim 10
Dependent Claim
21 words
The process of claim 8 wherein the liquid solvent fraction is one boiling within the 400° F to 700° F range.
Claim 11
Dependent Claim
31 words
The process of claim 2 wherein the quinone compound is added to the solvent in concentration ranging from about 0.01 to about 5 percent, based on the weight of the feed.
References Cited (Backward Citations)
US3700583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |