US4079005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for separating undissolved solids from a coal liquefaction product
Assignee: Honeywell UOP LLC
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Filing: 1976-12-14
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Granted: 1978-03-14
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Expires: 1996-12-14
Abstract
Abstract Production of a low mineral content fuel by a coal liquefaction process utilizing an asphaltene-free hydrogenated coal solvent which yields as the primary product a mixture of liquid and solids, a part of which is suspended in the liquid. The suspended solids are effectively removed with minimum loss of desired product by means of a light aromatic solvent in combination with a hydrogenated coal solvent, having been hydrogenated to remove at least about 80% of the asphaltenes.
Inventors
- 👤 Gim Tan
- 👤 John G. Gatsis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:49
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/006; C10G1/002; C10G1/04; C10G1/045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
A method for separating undissolved solids from a coal liquefaction product comprising the steps of: a. admixing said coal liquefaction product with a hydrogenated coal oil solvent having been hydrogenated to remove at least about 80% of the asphaltenes and a light aromatic solvent, said light aromatic solvent being present from about 10 weight percent to about 1000 weight percent of said coal liquefaction product and b. introducing the resulting mixture into a separation zone maintained at a temperature of from about 10° to about 150° C. and a pressure of from about atmospheric to about 25 atmospheres, and therein separating undissolved solids from the admixed liquids.
Claim 2
Independent Claim
107 words
A method for separating undissolved solids from a coal liquefaction product comprising the steps of: a. admixing said coal liquefaction product with a hydrogenated coal oil solvent having been hydrogenated to remove at least about 80% of the asphaltenes and a light aromatic solvent, said light aromatic solvent being present from about 10 weight percent to about 1000 weight percent of said coal liquefaction product and b. introducing the resulting mixture into a separation zone maintained at a temperature of from about 10° to about 150° C. and a pressure of from about atmospheric to about 25 atmospheres, and therein separating undissolved solids from the admixed liquids.
Claim 3
Dependent Claim
15 words
The process of claim 1 further characterized in that said light aromatic solvent is benzene.
Claim 4
Dependent Claim
15 words
The process of claim 1 further characterized in that said light aromatic solvent is toluene.
Claim 5
Dependent Claim
15 words
The process of claim 1 further characterized in that said light aromatic solvent is xylene.
Claim 6
Dependent Claim
30 words
The process of claim 1 further characterized in that said hydrogenated coal oil solvent is from about 0.1 weight percent to about 1000 weight percent of said coal liquefaction product.
References Cited (Backward Citations)
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Cited
US3505203A
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US3598718A
Cited
US3607716A
Cited
US3607718A
Cited
US3997425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |