US4276053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel composition and method for its preparation
Assignee: BP PLC
•
Filing: 1979-12-04
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Granted: 1981-06-30
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Expires: 1999-12-04
Abstract
Abstract A stable, uniform solvent refined coal (SRC)--oil dispersion is prepared by grinding 15 to 55% by weight of SRC particles in the absence of free oxygen in a medium consisting essentially of gas oil and/or a heavier petroleum fraction. Grinding is continued until the size of the majority of the particles is reduced to a value in the range 1 to 10 micron. Preferably the SRC is uniformly dispersed in the gas oil and/or heavier petroleum fraction prior to grinding.
Inventors
- 👤 Christopher J. Veal
- 👤 Derek R. Wall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:39
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/32; C10L1/322; C21; C21B; C21B5/00; C21B5/001; C21B5/003; C21B5/004
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
61 words
A uniformly dispersed, stable fuel dispersion containing 15 to 55% by weight of SRC particles, the size of the majority of the particles being in the range 1 to 10 micron, in a medium consisting essentially of a gas oil and/or a heavier petroleum fraction, the percentage being expressed as a percentage by weight of the total weight of the dispersion.
Claim 2
Dependent Claim
61 words
A uniformly dispersed, stable fuel dispersion containing 15 to 55% by weight of SRC particles, the size of the majority of the particles being in the range 1 to 10 micron, in a medium consisting essentially of a gas oil and/or a heavier petroleum fraction, the percentage being expressed as a percentage by weight of the total weight of the dispersion.
Claim 3
Dependent Claim
14 words
A dispersion according to claim 1 wherein the petroleum fraction is a fuel oil.
Claim 4
Dependent Claim
24 words
A dispersion according to claim 2 wherein the fuel oil has a viscosity not greater than 3500 seconds Redwood No. 1 at 37.8° C.
Claim 5
Independent Claim
79 words
A method for the preparation of a stable, uniform SRC-oil dispersion which method comprises grinding 15 to 55% by weight of SRC particles in the absence of free oxygen in a medium consisting essentially of gas oil and/or a heavier petroleum fraction until the size of the majority of the particles is reduced to a value in the range 1 to 10 micron, the percentage being expressed as a percentage by weight of the total weight of the dispersion.
Claim 6
Independent Claim
79 words
A method for the preparation of a stable, uniform SRC-oil dispersion which method comprises grinding 15 to 55% by weight of SRC particles in the absence of free oxygen in a medium consisting essentially of gas oil and/or a heavier petroleum fraction until the size of the majority of the particles is reduced to a value in the range 1 to 10 micron, the percentage being expressed as a percentage by weight of the total weight of the dispersion.
Claim 7
Dependent Claim
19 words
A method according to claim 4 wherein grinding is carried out in a vibratory, agitatory or tumbling ball mill.
Claim 8
Independent Claim
27 words
A method according to either claims 4 or 5 wherein the SRC supplied to the grinding process is an SRC of particle size less than 250 micron.
Claim 9
Independent Claim
28 words
A method according to any of claims 4 to 6 wherein the SRC supplied is uniformly dispersed in the gas oil and/or heavier petroleum fraction prior to grinding.
Claim 10
Independent Claim
18 words
A method according to any of claims 4 to 7 wherein the petroleum fraction is a fuel oil.
Claim 11
Dependent Claim
24 words
A method according to claim 8 wherein the fuel oil has a viscosity not greater than 3500 seconds Redwood No. 1 at 37.8° C.
References Cited (Backward Citations)
US2231513A
Cited
GB1523193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |