Patent US4309270A successfully refreshed from Google Patents.
US4309270A
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US
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Flash pyrolysis of agglomerating coal
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1979-06-12
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Granted: 1982-01-05
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Expires: 1999-06-12
Abstract
Abstract A technique is described which enables agglomerating coals (caking coals) to be flash pyrolyzed in a fluidized-bed reactor without agglomerates forming in the fluidized-bed. The technique requires the inert particles of the fluidized-bed to be coarser and denser than the particulate coal being pyrolyzed. With this arrangement the momentum of the inert particles in the fluidized-bed is believed to destroy the agglomerates as they form.
Inventors
- 👤 Ralph J. Tyler
- 👤 Ian W. Smith
- 👤 James H. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:44
CPC Classifications
C; C10; C10B; C10B49/00; C10B49/16; C10B49/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
53 words
A method of flash pyrolysis of coal comprising feeding a stream of coal, in particulate form and suspended in an inert carrier, into a fluidised-bed maintained at a temperature in the range 400° C. to 1000° C., the fluidised-bed being formed of inert particles of larger particulate size and density than the coal.
Claim 2
Independent Claim
53 words
A method of flash pyrolysis of coal comprising feeding a stream of coal, in particulate form and suspended in an inert carrier, into a fluidised-bed maintained at a temperature in the range 400° C. to 1000° C., the fluidised-bed being formed of inert particles of larger particulate size and density than the coal.
Claim 3
Dependent Claim
28 words
A method as defined in claim 1, in which the average size of the particles of coal is about one-sixth the average size of the inert fluidised-bed particles.
Claim 4
Dependent Claim
23 words
A method as defined in claim 2, in which the fluidised-bed particles are sand particles having an average diameter of about 600 microns.
Claim 5
Dependent Claim
24 words
A method as defined in claim 1, in which the fluidised-bed is maintained at a temperature in the range 500° C. to 800° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |