US4110192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for liquefying coal employing a vented dissolver
Assignee: Gulf Research and Development Co
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Filing: 1976-11-30
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Granted: 1978-08-29
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Expires: 1996-11-30
Abstract
Abstract A process for liquefying coal employing a low temperature preheater zone, a higher temperature non-catalytic hydrocracking zone and a catalytic hydrogenation zone. The process is improved by venting gases from the high temperature hydrocracking zone.
Inventors
- 👤 Richard E. Hildebrand
- 👤 John A. Paraskos
- 👤 Herman Taylor, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:20
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/002
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
152 words
A process for liquefying coal at a hydrogen pressure above about 3,100 psi comprising passing a feed coal-solvent slurry and hydrogen through a tubular preheater zone to increase the temperature of the slurry to a maximum temperature from about 710° to about 800° F., passing effluent slurry from said preheater zone and hydrogen to a dissolver zone maintained at a temperature at least 10° F. higher than the maximum temperature in the preheater zone and in the range between about 750° and 900° F., the residence time in the dissolver zone being longer than in the preheater zone, venting a gaseous stream comprising carbon oxide gas, hydrogen and low boiling hydrocarbons from said dissolver zone, separately removing a liquid stream from said dissolver zone, and passing said removed liquid stream without a distillation step and hydrogen through a catalytic hydrogenation zone maintained at a temperature in the range 700° to 825° F.
Claim 2
Dependent Claim
152 words
A process for liquefying coal at a hydrogen pressure above about 3,100 psi comprising passing a feed coal-solvent slurry and hydrogen through a tubular preheater zone to increase the temperature of the slurry to a maximum temperature from about 710° to about 800° F., passing effluent slurry from said preheater zone and hydrogen to a dissolver zone maintained at a temperature at least 10° F. higher than the maximum temperature in the preheater zone and in the range between about 750° and 900° F., the residence time in the dissolver zone being longer than in the preheater zone, venting a gaseous stream comprising carbon oxide gas, hydrogen and low boiling hydrocarbons from said dissolver zone, separately removing a liquid stream from said dissolver zone, and passing said removed liquid stream without a distillation step and hydrogen through a catalytic hydrogenation zone maintained at a temperature in the range 700° to 825° F.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the hydrogen pressure is above about 3,500 psi.
Claim 4
Dependent Claim
35 words
The process of claim 1 including the step of obtaining a catalytic hydrogenation zone effluent stream and separating a solvent boiling range fraction therefrom, and recycling said solvent boiling range fraction to said preheater zone.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein said dissolver zone liquid stream is quenched with hydrogen before being passed to said catalytic hydrogenation zone.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein at least 4,000 SCF of hydrogen per ton of said feed coal are chemically consumed in said catalytic hydrogenation zone.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein said vented gaseous stream comprises hydrocarbons boiling up to about 450° F.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein a relatively high ash-containing slurry is separately removed from said dissolver zone.
Claim 9
Dependent Claim
25 words
The process of claim 1 wherein the temperature in said dissolver zone is at least 50° F. higher than the temperature in said preheater zone.
Claim 10
Dependent Claim
25 words
The process of claim 1 wherein the temperature in said dissolver zone is at least 100° F. higher than the temperature in said preheater zone.
Claim 11
Dependent Claim
16 words
The process of claim 1 wherein the preheater zone residence time is 2 to 20 minutes.
Claim 12
Dependent Claim
16 words
The process of claim 1 wherein the dissolver zone residence time is 5 to 60 minutes.
Claim 13
Dependent Claim
20 words
The process of claim 1 wherein the temperature in the dissolver zone is from above 800° F. to 900° F.
Claim 14
Dependent Claim
20 words
The process of claim 1 wherein the temperature in the catalytic hydrogenation zone is lower than in the dissolver zone.
Claim 15
Dependent Claim
22 words
The process of claim 1 wherein the liquid residence time in the catalytic hydrogenation zone is lower than in the dissolver zone.
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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |