US4124485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of solids from coal liquids with an additive blend
Assignee: Gulf Research and Development Co
•
Filing: 1977-04-04
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Granted: 1978-11-07
•
Expires: 1997-04-04
Abstract
Abstract Ash-containing solids are separated from coal liquid by adding a blend comprising alcohol and a light oil fraction to said coal liquid, followed by a solids-liquid separation step.
Inventors
- 👤 Norman L. Carr
- 👤 Edgar L. McGinnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:33
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04; C10G1/045; C10L; C10L9/00; C10L9/02; Y; Y10; Y10S; Y10S208/00; Y10S208/951
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
In a process for removing ash from coal including a dissolving step wherein coal hydrocarbonaceous material is dissolved with a hydroaromatic solvent to produce an effluent stream comprising dissolved coal liquid, hydroaromatics and suspended ash-containing solids, and passing said effluent stream to a solids-liquid separation step, the improvement comprising adding a blend comprising alcohol and a light oil fraction boiling no higher than about 500° F. to said effluent stream in advance of said solids-liquid separation step, said alcohol comprising an aliphatic alcohol containing between 2 and 10 carbon atoms which forms a homogeneous composition within said coal liquid.
Claim 2
Dependent Claim
99 words
In a process for removing ash from coal including a dissolving step wherein coal hydrocarbonaceous material is dissolved with a hydroaromatic solvent to produce an effluent stream comprising dissolved coal liquid, hydroaromatics and suspended ash-containing solids, and passing said effluent stream to a solids-liquid separation step, the improvement comprising adding a blend comprising alcohol and a light oil fraction boiling no higher than about 500° F. to said effluent stream in advance of said solids-liquid separation step, said alcohol comprising an aliphatic alcohol containing between 2 and 10 carbon atoms which forms a homogeneous composition within said coal liquid.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein said light oil fraction is a substantially ash-free coal liquid fraction boiling no higher than about 355° F.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein said light oil comprises a petroleum naphtha.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein the amount of said blend comprises between 1 to 50 weight percent of said ash-containing coal liquid.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein said blend comprises between about 1 and 75 weight percent alcohol.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein said blend comprises between about 10 and 25 weight percent alcohol.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein said alcohol comprises isopropanol or normal, secondary or tertiary butanol.
Claim 9
Dependent Claim
55 words
The process of claim 1 wherein said dissolving step is performed in the presence of hydrogen and/or carbon monoxide, said effluent stream containing said blend is held from 30 seconds to 3 hours before separation step, and said effluent stream contains at least 3 weight percent ash and at least 2 weight percent of hydroaromatics.
Claim 10
Dependent Claim
28 words
The process of claim 1 wherein said blend is added to said effluent stream while the temperature of the effluent stream is between about 100° and 700° F.
Claim 11
Dependent Claim
13 words
The process of claim 1 wherein said separation step is a filtration step.
Claim 12
Dependent Claim
15 words
The process of claim 1 wherein said blend is a recycle stream of said process.
References Cited (Backward Citations)
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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) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |