US3775286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation of coal
Assignee: Council of Scientific and Industrial Research
•
Filing: 1971-09-07
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Granted: 1973-11-27
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Expires: 1991-09-07
Abstract
Abstract A process of catalytic hydrogenation of coal comprising impregnating a water-soluble iron salt (chloride, nitrate, sulphate) into discrete coal particles, chemically converting such water-soluble iron salt into iron oxide and generating activated iron oxide catalyst by subjecting the iron oxide coated coal particles to pressure-temperature conditions in a hydrogenhydrogen sulfide atmosphere.
Inventors
- 👤 D Mukherjee
- 👤 P Chowdhury
- 👤 J Sama
- 👤 A Basu
- 👤 N Basak
- 👤 A Lahiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:50
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/08; C10G1/086; Y; Y10; Y10S; Y10S208/00; Y10S208/951
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
111 words
A process of catalytic hydrogenation of coal comprising the sequential steps of: i. mixing powdered coal with a solution of an iron salt so that said salt impregnates said coal; ii. gradually adding ammonium hydroxide to the resultant mixture in an amount sufficient to achieve effective conversion of the iron salt to hydrated iron oxide; iii. allowing solids within said mixture to settle, filtering and washing said solids until the filter washings remain at a pH between about 7 and 8; iv. drying the washed solids in the absence of oxygen; and v. adding a sulfur-yielding material to the dried solids and subjecting the resultant mixture to coal catalytic hydrogenation conditions.
Claim 2
Dependent Claim
22 words
A process as claimed in claim 2, wherein the washing referred to in step (iii) is effected with an ammonium nitrate solution.
Claim 3
Dependent Claim
30 words
A process as claimed in claim 2, wherein the coal is powdered to a 60-200 mesh or 250-75 micron size, before it is mixed with the solution of iron salt.
Claim 4
Dependent Claim
25 words
A process as claimed in claim 2, wherein the iron salt is selected from the group consisting of ferrous sulfate, ferric chloride and ferric nitrate.
Claim 5
Dependent Claim
38 words
A process as claimed in claim 2, wherein the solution of the iron salt is heated to a temperature of 80*-100*C before the powdered coal is added to it and is maintained at this temperature during step (ii).
Claim 6
Dependent Claim
26 words
A process as claimed in claim 2, wherein the ammonium hydroxide solution used for interaction with the iron salt is of a strength of about 1:1.
Claim 7
Dependent Claim
26 words
A process as claimed in claim 2, wherein the mixture to which ammonium hydroxide has been added is allowed to settle for 1 to 2 hours.
Claim 8
Dependent Claim
31 words
A process as claimed in claim 2, wherein the iron salt used is ferric chloride, and the washing of the solids is effected until the washings are free of chloride ion.
Claim 9
Dependent Claim
22 words
A process as claimed in claim 2, wherein the drying of the washed solids is carried out at a temperature of 110*C.
Claim 10
Dependent Claim
27 words
A process as claimed in claim 2, wherein the drying of the washed solids is carried out until its moisture content is about 2 to 3 percent.
References Cited (Backward Citations)
US1946341A
Cited
US3502564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |