Patent US4420930A successfully refreshed from Google Patents.
US4420930A
Expired / Lapsed
US
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Process for operating a furnace or a combustion engine
Assignee: Gulf Research and Development Co
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Filing: 1981-02-09
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Granted: 1983-12-20
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Expires: 2001-02-09
Abstract
Abstract Process for operating a furnace or a combustion engine which comprises burning in said furnace or said combustion engine a mixture of polycyclic, polycarboxylic acids obtained by oxidizing coal with aqueous nitric acid, separating from the resulting product an aqueous phase and a solid phase and then extracting the solid phase with a solvent to recover said mixture.
Inventors
- 👤 Harold Beuther
- 👤 Johann G. Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:16
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/27; C10; C10G; C10G1/00; C10L; C10L1/00; C10L1/02
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
58 words
Process for operating a furnace or a combustion engine which comprises burning in said furnace or said combustion engine a mixture of polycyclic, polycarboxylic acids obtained by oxidizing coal with aqueous nitric acid, separating from the resulting product an aqueous phase and a solid phase and then extracting the solid phase with a solvent to recover said mixture.
Claim 2
Dependent Claim
58 words
Process for operating a furnace or a combustion engine which comprises burning in said furnace or said combustion engine a mixture of polycyclic, polycarboxylic acids obtained by oxidizing coal with aqueous nitric acid, separating from the resulting product an aqueous phase and a solid phase and then extracting the solid phase with a solvent to recover said mixture.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the coal being oxidized is in an aqueous slurry containing from about 40 to about 95 weight percent water.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein the coal being oxidized is in an aqueous slurry containing from about 50 to about 70 weight percent water.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the nitric acid has a concentration of about five to about 90 percent.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the nitric acid has a concentration of about 10 to about 70 percent.
Claim 7
Dependent Claim
45 words
The process of claim 1 wherein the oxidation is carried out at a temperature of about 5° to about 200° C. and a pressure of about atmospheric to about 1000 pounds per square inch gauge over a period of about 0.5 to about 15 hours.
Claim 8
Dependent Claim
45 words
The process of claim 1 wherein the oxidation is carried out at a temperature of about 50° to about 100° C. and a pressure of about atmospheric to about 500 pounds per square inch gauge over a period of about two to about six hours.
Claim 9
Dependent Claim
12 words
The process of claim 1 wherein said separation is effected by filtration.
Claim 10
Dependent Claim
23 words
The process of claim 1 wherein said extraction is carried out using a solvent that will dissolve carbonaceous material in said solid phase.
Claim 11
Dependent Claim
15 words
The process of claim 1 wherein said extraction is carried out using a polar solvent.
Claim 12
Dependent Claim
41 words
The process of claim 1 wherein said extraction is carried out using at least one solvent selected from the group consisting of acetone, methylethylketone, cyclohexanone, methanol, ethanol, normal propanol, isopropanol, tetrahydrofuran, dioxane, acetol, diacetone alcohol, 4-hydroxy-2-butanone,3-hydroxy-2-butanone, 4-hydroxy-2-pentanone, tetrahydrofurfuryl alcohol and 2-hydroxymethyltetrahydrofuran.
Claim 13
Dependent Claim
13 words
The process of claim 1 wherein said extraction is carried out using acetone.
Claim 14
Dependent Claim
13 words
The process of claim 1 wherein said extraction is carried out using methylethylketone.
Claim 15
Dependent Claim
13 words
The process of claim 1 wherein said burning is effected in a furnace.
Claim 16
Dependent Claim
15 words
The process of claim 1 wherein said burning is effected in an internal combustion engine.
Claim 17
Dependent Claim
15 words
The process of claim 1 wherein said burning is effected in an external combustion engine.
Claim 18
Dependent Claim
14 words
The process of claim 1 wherein said burning is effected in a Diesel engine.
Claim 19
Dependent Claim
13 words
The process of claim 1 wherein said burning is effected in a turbine.
Claim 20
Dependent Claim
39 words
The process of claim 1 wherein the fuel comprises a (1) a mixture of said polycyclic, polycarboxylic acids and (2) an organic component selected from the group consisting of methanol, ethanol, normal propanol, isopropanol and a liquid hydrocarbon fuel.
Claim 21
Dependent Claim
11 words
The process of claim 19 wherein said organic component is methanol.
Claim 22
Dependent Claim
11 words
The process of claim 19 wherein said organic component is ethanol.
Claim 23
Dependent Claim
14 words
The process of claim 19 wherein said organic component is a liquid hydrocarbon fuel.
Claim 24
Dependent Claim
13 words
The process of claim 19 wherein said burning is effected in a furnace.
Claim 25
Dependent Claim
15 words
The process of claim 19 wherein said burning is effected in an internal combustion engine.
Claim 26
Dependent Claim
15 words
The process of claim 19 wherein said burning is effected in an external combustion engine.
Claim 27
Dependent Claim
14 words
The process of claim 19 wherein said burning is effected in a Diesel engine.
Claim 28
Dependent Claim
13 words
The process of claim 19 wherein said burning is effected in a turbine.
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) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |