US4391608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the beneficiation of carbonous materials with the aid of ultrasound
Assignee: MINERS AND MECHANICS SAVINGS & TRUST Co
•
Filing: 1981-08-03
•
Granted: 1983-07-05
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Expires: 2001-08-03
Abstract
Abstract A process for reducing the sulfur and ash content of coal and the like by treatment in an aqueous slurry with ultrasound followed by subsequent separating steps.
Inventors
- 👤 Michael A. Dondelewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:27
CPC Classifications
C; C10; C10L; C10L9/00; Y; Y10; Y10S; Y10S44/00; Y10S44/904
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A method of treating coal to reduce ash and sulfur content comprising the steps for: (a) combining the coal with water and oil to form a slurry, said oil being a semi-reactive oil containing esters of fatty acids, (b) applying ultrasound to said slurry to cause separation of ash from coal and sulfur including organic sulfur from coal, (c) physically separating coal and adhered oil from the slurry and washing to separate ash and sulfur from the coal to recover coal with reduced sulfur and ash content.
Claim 2
Independent Claim
87 words
A method of treating coal to reduce ash and sulfur content comprising the steps for: (a) combining the coal with water and oil to form a slurry, said oil being a semi-reactive oil containing esters of fatty acids, (b) applying ultrasound to said slurry to cause separation of ash from coal and sulfur including organic sulfur from coal, (c) physically separating coal and adhered oil from the slurry and washing to separate ash and sulfur from the coal to recover coal with reduced sulfur and ash content.
Claim 3
Dependent Claim
21 words
A method according to claim 1 wherein the coal is first crushed and sized to a more or less uniform dimension.
Claim 4
Dependent Claim
26 words
A method according to claim 1 wherein said oil is present in an amount up to 5% by weight of the coal added to the slurry.
Claim 5
Independent Claim
16 words
A method according to claims 1 or 2 wherein sodium chloride is added to the slurry.
Claim 6
Independent Claim
22 words
A method according to claims 1 or 2 wherein the frequency of applied sound is between 20 and 40 kilocycles per second.
Claim 7
Independent Claim
20 words
A method according to claims 1 or 2 wherein the temperature of the slurry is maintained less than 75° C.
Claim 8
Independent Claim
25 words
The method according to claims 1 or 2 wherein the weight ratio of coal to water in the slurry comprises between about 1:20 and 1:3.
References Cited (Backward Citations)
GB183430A
Cited
US3616375A
Cited
US3497005A
Cited
US4108759A
Cited
US4156593A
Cited
US4167397A
Cited
GB2023172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |