US4046690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering coal-derived oil through a filter media precoated with particles partially solubilized by said oil
Assignee: Energy Research and Development Administration ERDA
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Filing: 1976-04-01
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Granted: 1977-09-06
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Expires: 1996-04-01
Abstract
Abstract Solids such as char, ash, and refractory organic compounds are removed from coal-derived liquids from coal liquefaction processes by the pressure precoat filtration method using particles of 85-350 mesh material selected from the group of bituminous coal, anthracite coal, lignite, and devolatilized coals as precoat materials and as body feed to the unfiltered coal-derived liquid.
Inventors
- 👤 Billy R. Rodgers
- 👤 Michael S. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:31
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04; C10G1/045; B; B01; B01D; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
A method for separating solids such as char, ash, and refractory organic compounds from a viscous slurry comprising tars, asphaltenes, and up to 25 wt.% of said solids including ash particles smaller than 1 micron, said method comprising the steps of: a. forming a layer of partially solubilized 85-350 mesh particles of anthracite coal, bituminous coal, lignite, devolatilized anthracite coal, devolatilized bituminous coal, or devolatilized lignite on a filter media; b. filtering said viscous slurry through said layer and said media at a differential pressure of about 0.1-10 atmosphere across said media and said layer so as to recover a liquid containing less than 0.15 wt.% ash.
Claim 2
Independent Claim
107 words
A method for separating solids such as char, ash, and refractory organic compounds from a viscous slurry comprising tars, asphaltenes, and up to 25 wt.% of said solids including ash particles smaller than 1 micron, said method comprising the steps of: a. forming a layer of partially solubilized 85-350 mesh particles of anthracite coal, bituminous coal, lignite, devolatilized anthracite coal, devolatilized bituminous coal, or devolatilized lignite on a filter media; b. filtering said viscous slurry through said layer and said media at a differential pressure of about 0.1-10 atmosphere across said media and said layer so as to recover a liquid containing less than 0.15 wt.% ash.
Claim 3
Dependent Claim
18 words
The method of claim 1 in which said layer is formed as a precoat on said filter media.
Claim 4
Dependent Claim
19 words
The method of claim 2 in which said differential pressure is about 1 to 10 atmospheres across said media.
Claim 5
Dependent Claim
20 words
The method of claim 2 in which said particles are added to said viscous slurry prior to said filtering step.
Claim 6
Dependent Claim
20 words
The method of claim 1 in which said particles are added to said viscous slurry prior to said filtering step.
Claim 7
Dependent Claim
20 words
The method of claim 1 in which said filtering step is carried out at a temperature above about 150° F.
Claim 8
Dependent Claim
20 words
The method of claim 1 in which said layer is formed from particles of anthracite coal, bituminous coal, or lignite.
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) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |