Patent US4147882A successfully refreshed from Google Patents.
US4147882A
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Organic acids and process for preparing same
Assignee: Gulf Research and Development Co
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Filing: 1977-07-05
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Granted: 1979-04-03
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Expires: 1997-07-05
Abstract
Abstract A mixture of polycyclic aromatic polycarboxylic acids that is substantially insoluble in acetone and substantially insoluble in water and a process for preparing the mixture.
Inventors
- 👤 Johann G. D. Schulz
- 👤 Edward T. Sabourin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:30
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/08; C07; C07C; C07C201/00; C07C201/06; C07C201/16; C07C51/00; C07C51/16; C07C51/27
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
133 words
A process for converting a carbonaceous material selected from the group consisting of coal and lignite to a mixture of polycyclic aromatic polycarboxylic acids that is insoluble in acetone and insoluble in water which comprises subjecting an aqueous slurry containing said carbonaceous material in particulate form and from about 50 to about 90 weight percent water to oxidation with aqueous nitric acid, having a concentration of about five to about 90 percent, the reaction mixture being maintained at a temperature of about 15° to about 200° C. for about 0.5 to about 15 hours, mechanically separating the solids in the resulting slurry, extracting the resulting solids with a polar solvent to obtain an acetone-soluble fraction and an acetone-insoluble fraction, and then recovering said acetone-insoluble fraction as said mixture of polycyclic aromatic polycarboxylic acids.
Claim 2
Dependent Claim
133 words
A process for converting a carbonaceous material selected from the group consisting of coal and lignite to a mixture of polycyclic aromatic polycarboxylic acids that is insoluble in acetone and insoluble in water which comprises subjecting an aqueous slurry containing said carbonaceous material in particulate form and from about 50 to about 90 weight percent water to oxidation with aqueous nitric acid, having a concentration of about five to about 90 percent, the reaction mixture being maintained at a temperature of about 15° to about 200° C. for about 0.5 to about 15 hours, mechanically separating the solids in the resulting slurry, extracting the resulting solids with a polar solvent to obtain an acetone-soluble fraction and an acetone-insoluble fraction, and then recovering said acetone-insoluble fraction as said mixture of polycyclic aromatic polycarboxylic acids.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said polar solvent is acetone.
Claim 4
Dependent Claim
42 words
The process of claim 1 wherein the nitric acid has a concentration of about 10 to about 70 percent and the reaction is carried out at a temperature of about 50° to about 100° C. for about two to about six hours.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein the mechanical separation is effected by filtration.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the acetone separation is effected by subjecting the acetone extract to drying.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein the carbonaceous material is coal.
Claim 8
Dependent Claim
11 words
The process of claim 1 wherein the carbonaceous material is lignite.
Claim 9
Dependent Claim
21 words
A mixture of polycyclic aromatic polycarboxylic acids insoluble in acetone and insoluble in water resulting from the process of claim 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) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |