US4169710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for comminuting and reducing the sulfur and ash content of coal
Assignee: Chevron USA Inc
•
Filing: 1978-03-29
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Granted: 1979-10-02
•
Expires: 1998-03-29
Abstract
Abstract Coal may be effectively comminuted and the ash and sulfur content thereof reduced by contacting the coal with a hydrogen halide such as HF.
Inventors
- 👤 Harbo P. Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:18
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
26 words
A process for comminuting raw coal, which comprises: treating said coal with a hydrogen halide at an effective concentration level such that the coal is comminuted.
Claim 2
Dependent Claim
26 words
A process for comminuting raw coal, which comprises: treating said coal with a hydrogen halide at an effective concentration level such that the coal is comminuted.
Claim 3
Dependent Claim
78 words
A process for comminuting raw coal containing sulfur and ash, which comprises: treating said coal with a hydrogen halide in an effective concentration to produce fine coal particles substantially liberated from at least a portion of said sulfur and ash and to convert at least a portion of said sulfur and ash to solubles dissolved in said hydrogen halide; and substantially separating the hydrogen halide and dissolved solubles from the fine coal particles and remaining sulfur and ash.
Claim 4
Dependent Claim
78 words
A process for comminuting raw coal containing sulfur and ash, which comprises: treating said coal with a hydrogen halide in an effective concentration to produce fine coal particles substantially liberated from at least a portion of said sulfur and ash and to convert at least a portion of said sulfur and ash to solubles dissolved in said hydrogen halide; and substantially separating the hydrogen halide and dissolved solubles from the fine coal particles and remaining sulfur and ash.
Claim 5
Dependent Claim
32 words
A process as recited in claim 2, which further comprises: recycling at least a portion of the hydrogen halide and dissolved solubles from the separating step for use in the treating step.
Claim 6
Dependent Claim
60 words
A process as recited in claim 2, which further comprises: separating at least a portion of the dissolved solubles from at least a portion of the hydrogen halide and dissolved solubles from the preceding separation step to produce a hydrogen halide with reduced dissolved solubles; and recycling said hydrogen halide with reduced dissolved solubles for use in the treating step.
Claim 7
Dependent Claim
22 words
A process as recited in claim 4, which further comprises: substantially separating the fine coal particles from the remaining sulfur and ash.
Claim 8
Dependent Claim
39 words
A process as recited in claim 2 or claim 3 or claim 4 or claim 5 wherein said hydrogen halide in an effective concentration is an aqueous HF solution having an HF conentration of at least 48 weight percent.
Claim 9
Dependent Claim
39 words
A process as recited in claim 2 or claim 3 or claim 4 or claim 5 wherein said hydrogen halide in an effective concentration is an aqueous HCl solution having an HCl concentration of at least 37 weight percent.
References Cited (Backward Citations)
US3850447A
Cited
US3863846A
Cited
US3870237A
Cited
US3918761A
Cited
US4071328A
Cited
US4083940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |