Patent US4261701A successfully refreshed from Google Patents.
US4261701A
Expired / Lapsed
US
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Uniform coal suspensions and process for preparing same
Assignee: Gulf Research and Development Co
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Filing: 1980-01-09
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Granted: 1981-04-14
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Expires: 2000-01-09
Abstract
Abstract A suspension containing coal, water and the product resulting from the reaction of (1) polycyclic, polycarboxylic acids obtained as a result of the oxidation of coal with (2) a base. The process for preparing such suspensions is also claimed.
Inventors
- 👤 Johann G. D. Schulz
- 👤 John A. Cobler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:06
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/32; C10L1/326; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/02; Y10S516/06
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
30 words
A suspension containing coal, water and the product resulting from the reaction of (1) polycyclic, polycarboxylic acids obtained as a result of the oxidation of coal with (2) a base.
Claim 2
Dependent Claim
30 words
A suspension containing coal, water and the product resulting from the reaction of (1) polycyclic, polycarboxylic acids obtained as a result of the oxidation of coal with (2) a base.
Claim 3
Dependent Claim
11 words
The suspension of claim 1 wherein said product is water soluble.
Claim 4
Dependent Claim
11 words
The suspension of claim 1 wherein said product is water insoluble.
Claim 5
Dependent Claim
13 words
The suspension of claim 1 wherein said first coal is a bituminous coal.
Claim 6
Dependent Claim
11 words
The suspension of claim 1 wherein said first coal is lignite.
Claim 7
Dependent Claim
21 words
The suspension of claim 1 wherein said first coal has a particle size of about one inch to about 500 mesh.
Claim 8
Dependent Claim
21 words
The suspension of claim 1 wherein said first coal has a particle size of about one-half inch to about 200 mesh.
Claim 9
Dependent Claim
44 words
The suspension of claim 1 wherein the weight ratio of said first coal to water is in the range of about 19:1 to about 1:6 and the weight ratio of said product to water is in the range of about 1:199 to about 1:3.
Claim 10
Dependent Claim
44 words
The suspension of claim 1 wherein the weight ratio of said first coal to water is in the range of about 4:1 to about 1:4 and the weight ratio of said product to water is in the range of about 1:49 to about 1:4.
Claim 11
Dependent Claim
22 words
The suspension of claim 1 wherein said polycyclic, polycarboxylic acids are obtained as a result of the nitric acid oxidation of coal.
Claim 12
Dependent Claim
63 words
The suspension of claim 1 wherein said polycyclic, polycarboxylic acids are obtained as a result of the nitric acid oxidation of coal, said oxidation comprising subjecting a slurry containing coal to reaction with nitric acid having a concentration of about one to about 90 percent at a temperature of about 15° to about 200° C. for about five minutes to about 15 hours.
Claim 13
Dependent Claim
62 words
The suspension of claim 1 wherein said polycyclic, polycarboxylic acids are obtained as a result of the nitric acid oxidation of coal, said oxidation comprising subjecting a slurry containing coal to reaction with nitric acid having a concentration of about three to about 70 percent at a temperature of about 50° to about 100° C. for about two to about six hours.
Claim 14
Dependent Claim
14 words
The suspension of claim 1 wherein said coal being oxidized is a bituminous coal.
Claim 15
Dependent Claim
12 words
The suspension of claim 1 wherein said coal being oxidized is lignite.
Claim 16
Dependent Claim
12 words
The suspension of claim 1 wherein said base is an organic base.
Claim 17
Dependent Claim
21 words
The suspension of claim 1 wherein said base is a hydroxide of an element of Group IA of the Periodic Table.
Claim 18
Dependent Claim
21 words
The suspension of claim 1 wherein said base is a hydroxide of an element of Group IIA of the Periodic Table.
Claim 19
Dependent Claim
11 words
The suspension of claim 1 wherein said base is sodium hydroxide.
Claim 20
Dependent Claim
11 words
The suspension of claim 1 wherein said base is potassium hydroxide.
Claim 21
Dependent Claim
11 words
The suspension of claim 1 wherein said base is calcium hydroxide.
Claim 22
Dependent Claim
24 words
The suspension of claim 1 wherein said reaction with said base is carried out at a temperature of about 5° to about 150° C.
Claim 23
Dependent Claim
24 words
The suspension of claim 1 wherein said reaction with said base is carried out at a temperature of about 15° to about 90° C.
Claim 24
Dependent Claim
49 words
A process for preparing a suspension which comprises mixing an aqueous mixture containing (I) the product resulting from the reaction of (I) polycyclic, polycarboxylic acids obtained as a result of the oxidation of coal with (2) a base with (II) coal for a time sufficient to obtain a suspension.
Claim 25
Dependent Claim
49 words
A process for preparing a suspension which comprises mixing an aqueous mixture containing (I) the product resulting from the reaction of (I) polycyclic, polycarboxylic acids obtained as a result of the oxidation of coal with (2) a base with (II) coal for a time sufficient to obtain a suspension.
Claim 26
Dependent Claim
11 words
The process of claim 23 wherein said product is water soluble.
Claim 27
Dependent Claim
11 words
The process of claim 23 wherein said product is water insoluble.
Claim 28
Dependent Claim
13 words
The process of claim 23 wherein said second coal is a bituminous coal.
Claim 29
Dependent Claim
11 words
The process of claim 23 wherein said second coal is lignite.
Claim 30
Dependent Claim
21 words
The process of claim 23 wherein said second coal has a particle size of about one inch to about 500 mesh.
Claim 31
Dependent Claim
21 words
The process of claim 23 wherein said second coal has a particle size of about one-half inch to about 200 mesh.
Claim 32
Dependent Claim
44 words
The process of claim 23 wherein the weight ratio of said second coal to water is in the range of about 19:1 to about 1:6 and the weight ratio of said product to water is in the range of about 1:199 to about 1:3.
Claim 33
Dependent Claim
44 words
The process of claim 23 wherein the weight ratio of said second coal to water is in the range of about 4:1 to about 1:4 and the weight ratio of said product to water is in the range of about 1:49 to about 1:4.
Claim 34
Dependent Claim
22 words
The process of claim 23 wherein said polycyclic, polycarboxylic acids are obtained as a result of the nitric acid oxidation of coal.
Claim 35
Dependent Claim
63 words
The process of claim 23 wherein said polycyclic, polycarboxylic acids are obtained as a result of the nitric acid oxidation of coal, said oxidation comprising subjecting a slurry containing coal to reaction with nitric acid having a concentration of about one to about 90 percent at a temperature of about 15° to about 200° C. for about five minutes to about 15 hours.
Claim 36
Dependent Claim
62 words
The process of claim 23 wherein said polycyclic, polycarboxylic acids are obtained as a result of the nitric acid oxidation of coal, said oxidation comprising subjecting a slurry containing coal to reaction with nitric acid having a concentration of about three to about 70 percent at a temperature of about 50° to about 100° C. for about two to about six hours.
Claim 37
Dependent Claim
12 words
The process of claim 23 wherein said coal is a bituminous coal.
Claim 38
Dependent Claim
10 words
The process of claim 23 wherein said coal is lignite.
Claim 39
Dependent Claim
12 words
The process of claim 23 wherein said base is an organic base.
Claim 40
Dependent Claim
21 words
The process of claim 23 wherein said base is a hydroxide of an element of Group IA of the Periodic Table.
Claim 41
Dependent Claim
21 words
The process of claim 23 wherein said base is a hydroxide of an element of Group IIA of the Periodic Table.
Claim 42
Dependent Claim
11 words
The process of claim 23 wherein said base is sodium hydroxide.
Claim 43
Dependent Claim
11 words
The process of claim 23 wherein said base is potassium hydroxide.
Claim 44
Dependent Claim
11 words
The process of claim 23 wherein said base is calcium hydroxide.
Claim 45
Dependent Claim
24 words
The process of claim 23 wherein said reaction with said base is carried out at a temperature of about 5° to about 150° C.
Claim 46
Dependent Claim
24 words
The process of claim 23 wherein said reaction with said base is carried out at a temperature of about 15° to about 90° C.
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) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |