US4228002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enhanced anti-solvent sedimentation of solids from liquids using pressurized carbon dioxide gas
Assignee: Electric Power Research Institute
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Filing: 1978-09-15
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Granted: 1980-10-14
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Expires: 1998-09-15
Abstract
Abstract A method for increasing the sedimentation of mineral particles in feed liquids containing the same, particularly coal-derived liquids, by the use of an anti-solvent gas pressure technique. The mixture is held under a pressurized carbon dioxide atmosphere which causes an increase in the initial settling rate for sedimentation of the mineral particles from such liquids so that they may be used as fuels.
Inventors
- 👤 Kumbakonam R. Vaidyanathan
- 👤 Joseph D. Henry, Jr.
- 👤 Francis H. Verhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:55
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/01; C; C10; C10G; C10G1/00; C10G1/04; C10G1/045; C10G21/00; C10G21/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
101 words
A method for increasing the sedimentation of asphaltic material and solid mineral matter from coal-derived liquid containing the same, comprising the steps of: (a) mixing said coal-derived liquid with an anti-solvent capable of promoting precipitation of asphaltic material and enhancing the initial settling rate of said solid mineral matter, said anti-solvent selected from the group consisting of saturated noncyclic hydrocarbons, cyclic hydrocarbons, aromatic hydrocarbons, and mixtures thereof, and (b) holding said mixture under a pressurized atmosphere having carbon dioxide as its major component by volume to precipitate and settle said asphaltic material and said solid mineral matter from said coal-derived liquid.
Claim 2
Independent Claim
101 words
A method for increasing the sedimentation of asphaltic material and solid mineral matter from coal-derived liquid containing the same, comprising the steps of: (a) mixing said coal-derived liquid with an anti-solvent capable of promoting precipitation of asphaltic material and enhancing the initial settling rate of said solid mineral matter, said anti-solvent selected from the group consisting of saturated noncyclic hydrocarbons, cyclic hydrocarbons, aromatic hydrocarbons, and mixtures thereof, and (b) holding said mixture under a pressurized atmosphere having carbon dioxide as its major component by volume to precipitate and settle said asphaltic material and said solid mineral matter from said coal-derived liquid.
Claim 3
Dependent Claim
13 words
The method of claim 1 in which said anti-solvent comprises mixed noncyclic hydrocarbons.
Claim 4
Dependent Claim
14 words
The method of claim 1 in which said atmosphere consists essentially of carbon dioxide.
Claim 5
Dependent Claim
18 words
The method of claim 3 in which the mineral matter comprises a mixture of silicates and iron sulfides.
Claim 6
Dependent Claim
17 words
The method of claim 3 in which the precipitated mineral matter is separated from said coal-derived liquid.
Claim 7
Dependent Claim
14 words
The method of claim 1 in which said coal-derived liquid comprises solvent refined coal.
Claim 8
Dependent Claim
56 words
The method of claim 1 in which step (a) is performed in a mixing vessel, step (b) is performed in a separate sedimentation vessel, and the same type of gas as said pressurized atmosphere is supplied under pressure to said mixing vessel to urge and transfer said mixture from the former vessel to the latter one.
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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |