US4312747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for deashing primary coal liquids
Assignee: Honeywell UOP LLC
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Filing: 1980-02-19
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Granted: 1982-01-26
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Expires: 2000-02-19
Abstract
Abstract A process for deashing primary coal liquids with a selective multi-solvent extraction wherein the coal liquids and a primary solvent are contacted initially at a temperature greater than the temperature at which the deashing extraction occurs.
Inventors
- 👤 John G. Gatsis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:07
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04; C10G1/002; C10G1/006; C10G1/045
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
In a process for deashing coal liquid by primary and secondary solvent extraction at a deashing solvent extraction temperature, the method which comprises: (a) admixing said coal liquid and a first selective solvent having a greater propensity to solubilize a greater quantity of the primary coal liquids than the hereinafter defined secondary solvent of step (b) at a temperature higher than said deashing solvent extraction temperature; (b) admixing the resulting admixture from step (a) with a second selective solvent having less propensity to solubilize a greater quantity of the primary coal liquids than said primary solvent of step (a) at a temperature lower than that of said step (a); (c) cooling said coal liquids, and primary and secondary solvents to the selective solvent extraction temperature; and (d) deashing said coal liquid by solvent extraction with said solvents at said deashing solvent extraction temperature.
Claim 2
Dependent Claim
143 words
In a process for deashing coal liquid by primary and secondary solvent extraction at a deashing solvent extraction temperature, the method which comprises: (a) admixing said coal liquid and a first selective solvent having a greater propensity to solubilize a greater quantity of the primary coal liquids than the hereinafter defined secondary solvent of step (b) at a temperature higher than said deashing solvent extraction temperature; (b) admixing the resulting admixture from step (a) with a second selective solvent having less propensity to solubilize a greater quantity of the primary coal liquids than said primary solvent of step (a) at a temperature lower than that of said step (a); (c) cooling said coal liquids, and primary and secondary solvents to the selective solvent extraction temperature; and (d) deashing said coal liquid by solvent extraction with said solvents at said deashing solvent extraction temperature.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said first solvent is toluene.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein said second solvent is hexane.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein said deashing is performed at a temperature from about 250° F. to about 500° F.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein said deashing is performed at a pressure from about 10 to about 1000 psig.
Claim 7
Dependent Claim
24 words
The process of claim 1 wherein said deashing is performed with a total solvent to oil ratio of from about 1:1 to about 10:1.
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) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |