US4415335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal preparation
Assignee: BP Australia Pty Ltd
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Filing: 1981-05-12
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Granted: 1983-11-15
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Expires: 2001-05-12
Abstract
Abstract PCT No. PCT/AU81/00055 Sec. 371 Date Jan. 7, 1982 Sec. 102(e) Date Jan. 7, 1982 PCT Filed May 12, 1981 PCT Pub. No. WO81/03337 PCT Pub. Date Nov. 26, 1981.Deashing of coal is achieved by oil agglomeration and subsequent separation of a carbon oil phase. The oil is removed by steam stripping after the coal oil agglomerates have been disintegrated. The fine coal product can be used in steam generating plants such as power stations.
Inventors
- 👤 David E. Mainwaring
- 👤 Charles U. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:40
CPC Classifications
B; B03; B03B; B03B9/00; B03B9/005; C; C10; C10L; C10L9/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
134 words
A method of separating an agglomerated mixture of finely divided coal particles and a liquid hydrocarbon to recover the hydrocarbon liquid and the coal as finely divided particles comprising: providing a conduit having a first end and a second end; introducing agglomerates of said coal particles and liquid hydrocarbon into said conduit adjacent said first end; contacing said agglomerates with steam at tempertures in excess of 200° C. to separate the liquid hydrocarbon from its association with said coal particles and to disintegrate said agglomerates into finely divided particles suspended in said steam and entrained liquid hydrocarbon; passing said separated coal particles and hydrocarbon liquid out of said second end of said conduit within 5 seconds of the steam contacting said agglomerates; and separating sequentially said coal particles and liquid hydrocarbon from said steam.
Claim 2
Independent Claim
134 words
A method of separating an agglomerated mixture of finely divided coal particles and a liquid hydrocarbon to recover the hydrocarbon liquid and the coal as finely divided particles comprising: providing a conduit having a first end and a second end; introducing agglomerates of said coal particles and liquid hydrocarbon into said conduit adjacent said first end; contacing said agglomerates with steam at tempertures in excess of 200° C. to separate the liquid hydrocarbon from its association with said coal particles and to disintegrate said agglomerates into finely divided particles suspended in said steam and entrained liquid hydrocarbon; passing said separated coal particles and hydrocarbon liquid out of said second end of said conduit within 5 seconds of the steam contacting said agglomerates; and separating sequentially said coal particles and liquid hydrocarbon from said steam.
Claim 3
Dependent Claim
44 words
A method as in claim 1 wherein: all of said agglomerates are above 1 mm. in size; at least 70 percent of the coal particles comprise particles less than 0.3 mm. in size; and the final product oil content is less than 2.5 percent.
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) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |