US4288232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ester containing fuel composition
Assignee: BASF Corp
•
Filing: 1979-12-19
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Granted: 1981-09-08
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Expires: 1999-12-19
Abstract
Abstract Unwanted settling in a composition comprising a suspension of fine particles of coal in fuel oil is eliminated or substantially reduced by adding an effective amount of a fatty acid ester of a polyoxypropylene-polyoxyethylene copolymer. The fatty acid has about 12 to 22 carbon atoms in the acyl group. The polyoxyethylene groups and polyoxypropylene groups have a total molecular weight of about 500 to 2000 and contain 0 to about 60 percent by weight polyoxyethylene groups.
Inventors
- 👤 Irving R. Schmolka
- 👤 Joseph H. Y. Niu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:52
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/32; C10L1/322; C10L1/324
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
82 words
A combustible fuel slurry comprising solid particulate carbonaceous material, liquid hydrocarbon fuel, and a minor slurry suspension stabilizing amount of a fatty acid ester of a polyoxyalkylene polymer wherein said fatty acid has about 12 to 22 carbon atoms in the acyl group, the polyoxyalkylene groups have a total molecular weight of about 500 to 2000 and said polyoxyalkylene polymer is selected from the group consisting of polyoxypropylene polymers and polyoxyethylene-polyoxypropylene copolymers containing up to about 60 percent by weight polyoxyethylene groups.
Claim 2
Dependent Claim
82 words
A combustible fuel slurry comprising solid particulate carbonaceous material, liquid hydrocarbon fuel, and a minor slurry suspension stabilizing amount of a fatty acid ester of a polyoxyalkylene polymer wherein said fatty acid has about 12 to 22 carbon atoms in the acyl group, the polyoxyalkylene groups have a total molecular weight of about 500 to 2000 and said polyoxyalkylene polymer is selected from the group consisting of polyoxypropylene polymers and polyoxyethylene-polyoxypropylene copolymers containing up to about 60 percent by weight polyoxyethylene groups.
Claim 3
Dependent Claim
13 words
The slurry of claim 1 wherein said fatty acid ester is predominantly monoester.
Claim 4
Dependent Claim
26 words
The slurry of claim 2 wherein said carbonaceous material is in the form of particles sufficiently fine that 80 percent pass through a 200 mesh screen.
Claim 5
Dependent Claim
48 words
The fuel slurry of claim 2 wherein the ratio of said solid particulate carbonaceous material to said liquid hydrocarbon fuel ranges from by weight 20:80 to 55:45 and the content of said fatty acid ester ranges from about 0.05 to 5 percent by weight of the total composition.
Claim 6
Dependent Claim
17 words
The fuel slurry of claim 4 wherein said stabilizer is the stearate ester of the polyoxypropylene-polyoxyethylene copolymer.
Claim 7
Dependent Claim
11 words
The fuel slurry of claim 4 including an aromatic hydrocarbon solvent.
Claim 8
Dependent Claim
24 words
The fuel slurry of claim 4 wherein said composition includes an aromatic hydrocarbon solvent in amount from about 0.05 to 5 percent by weight.
Claim 9
Dependent Claim
18 words
The fuel slurry of claim 4 wherein said slurry also contains a small but effective amount of water.
Claim 10
Dependent Claim
22 words
The fuel slurry of claim 4 wherein said slurry also contains water in amount from up to about 10 percent by weight.
Claim 11
Dependent Claim
18 words
The fuel slurry of claim 6 wherein said slurry also contains a small but effective amount of water.
Claim 12
Dependent Claim
22 words
The fuel slurry of claim 7 wherein said slurry also contains water in amount from up to about 10 percent by weight.
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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |