US4563197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of ethylene and other hydrocarbons from coal
Assignee: United States Department of Energy
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Filing: 1984-02-15
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Granted: 1986-01-07
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Expires: 2004-02-15
Abstract
Abstract A process for the production of economically significant amounts of ethylene and other hydrocarbon compounds, such as benzene, from coal is disclosed wherein coal is reacted with methane at a temperature in the approximate range of 500 DEG C. to 1100 DEG C. at a partial pressure less than about 200 psig for a period of less than 10 seconds. Ethylene and other hydrocarbon compounds may be separated from the product stream so produced, and the methane recycled for further production of ethylene. In another embodiment, other compounds produced, such as by-product tars, may be burned to heat the recycled methane.
Inventors
- 👤 Meyer Steinberg
- 👤 Peter Fallon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:43
CPC Classifications
C; C07; C07C; C07C1/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
A process for the production of ethylene from coal in commercially significant yields greater than 10% (% carbon converted to product) comprising the steps of: (a) reacting coal particulates entrained in a flow of gas consisting essentially of methane with said methane gas at a temperature in the approximate range of 850° C. to 1000° C. and at a partial pressure of approximately 50 psi for a period of time of approximately 1.5 seconds; and (b) recovering ethylene gas produced in said reaction from the product stream comprising in addition to said ethylene, said methane and other reaction products.
Claim 2
Dependent Claim
99 words
A process for the production of ethylene from coal in commercially significant yields greater than 10% (% carbon converted to product) comprising the steps of: (a) reacting coal particulates entrained in a flow of gas consisting essentially of methane with said methane gas at a temperature in the approximate range of 850° C. to 1000° C. and at a partial pressure of approximately 50 psi for a period of time of approximately 1.5 seconds; and (b) recovering ethylene gas produced in said reaction from the product stream comprising in addition to said ethylene, said methane and other reaction products.
Claim 3
Dependent Claim
28 words
A process as described in claim 1, wherein a portion of said other reaction products comprising tars, hydrogen sulfide, benzene, and light oils, are recovered from said methane.
Claim 4
Dependent Claim
26 words
A process as described in claim 2, wherein after said recovery a first portion of said methane is recycled for further reaction with said coal particulates.
Claim 5
Dependent Claim
60 words
A process as described in claim 2, wherein after said recovery a second portion of said methane is further processed for the removal of residual gases comprising carbon monoxide, carbon dioxide and hydrogen, said second portion then being mixed with said first portion prior to recycling, whereby the percentage of said residual gases in said recycled methane is below 20%.
Claim 6
Dependent Claim
17 words
A process as described in claim 1, wherein said reaction is carried out in a tubular reactor.
Claim 7
Dependent Claim
14 words
A process as described in claim 1, wherein said coal is a sub-bituminous coal.
References Cited (Backward Citations)
US2709675A
Cited
US3375175A
Cited
US3574065A
Cited
US3736233A
Cited
US3698882A
Cited
US3846096A
Cited
US3855070A
Cited
US4229185A
Cited
US4213826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |