Patent US4435376A successfully refreshed from Google Patents.
US4435376A
Expired / Lapsed
US
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Fibrous carbon production
Assignee: Phillips Petroleum Co
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Filing: 1982-03-26
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Granted: 1984-03-06
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Expires: 2002-03-26
Abstract
Abstract The production of fibrous carbon from hydrocarbons can be improved by employing recycled hydrocarbons as carrier gases.
Inventors
- 👤 Randall A. Porter
- 👤 Larry E. Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:19
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/127; D01F9/1271; B; B82; B82Y; B82Y30/00; D01F9/1278; D01F9/133
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
90 words
A process of decreasing the amount of externally-supplied carrier gas required in a pyrolysis operation for producing carbon particles from a carbonaceous feed comprising alkanes having from about 4 to about 10 carbon atoms comprising the steps of: (1) pyrolyzing the feed in a pyrolysis zone at a temperature ranging from about 500° C. to about 800° C., (2) removing hydrocarbon-containing effluent from the pyrolysis zone, (3) treating the effluent to remove hydrogen therefrom, and (4) employing the treated effluent as a carrier for carbonaceous feed to the pyrolysis zone.
Claim 2
Dependent Claim
90 words
A process of decreasing the amount of externally-supplied carrier gas required in a pyrolysis operation for producing carbon particles from a carbonaceous feed comprising alkanes having from about 4 to about 10 carbon atoms comprising the steps of: (1) pyrolyzing the feed in a pyrolysis zone at a temperature ranging from about 500° C. to about 800° C., (2) removing hydrocarbon-containing effluent from the pyrolysis zone, (3) treating the effluent to remove hydrogen therefrom, and (4) employing the treated effluent as a carrier for carbonaceous feed to the pyrolysis zone.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein excess methane is purged from the effluent between steps (2) and (4).
Claim 4
Dependent Claim
81 words
A process for pyrolyzing carbonaceous materials comprising C 4 -C 10 alkanes to produce carbon, which process includes the steps of: (1) pyrolyzing the feed in a pyrolysis reactor in the presence of a Group VIII catalyst at a temperature ranging from about 500° C. to about 800° C., (2) removing hydrocarbon-containing effluent from the pyrolysis reactor, (3) treating the effluent to remove hydrogen therefrom, and (4) employing the treated effluent as a carrier for carbonaceous feed to the pyrolysis reactor.
Claim 5
Dependent Claim
81 words
A process for pyrolyzing carbonaceous materials comprising C 4 -C 10 alkanes to produce carbon, which process includes the steps of: (1) pyrolyzing the feed in a pyrolysis reactor in the presence of a Group VIII catalyst at a temperature ranging from about 500° C. to about 800° C., (2) removing hydrocarbon-containing effluent from the pyrolysis reactor, (3) treating the effluent to remove hydrogen therefrom, and (4) employing the treated effluent as a carrier for carbonaceous feed to the pyrolysis reactor.
Claim 6
Dependent Claim
80 words
In a process of producing carbon fibers by pyrolyzing carbon-containing substances comprising alkanes having from about 4 to about 10 carbon atoms in a pyrolysis reactor temperatures ranging from about 500° C. to about 800° C. in the presence of carrier gases, the improvement comprising the steps of (1) removing hydrocarbon-containing effluent from the pyrolysis reactor, (2) treating the effluent to remove hydrogen therefrom, and (3) employing the treated effluent as a carrier for carbonaceous feed to the pyrolysis reactor.
Claim 7
Dependent Claim
80 words
In a process of producing carbon fibers by pyrolyzing carbon-containing substances comprising alkanes having from about 4 to about 10 carbon atoms in a pyrolysis reactor temperatures ranging from about 500° C. to about 800° C. in the presence of carrier gases, the improvement comprising the steps of (1) removing hydrocarbon-containing effluent from the pyrolysis reactor, (2) treating the effluent to remove hydrogen therefrom, and (3) employing the treated effluent as a carrier for carbonaceous feed to the pyrolysis reactor.
Claim 8
Dependent Claim
15 words
The process of claim 4 wherein the pyrolysis reaction takes place at about 700° C.
Claim 9
Dependent Claim
14 words
The process of claims 2 or 4 wherein step (3) includes a demethanizing operation.
Claim 10
Dependent Claim
12 words
The process of claim 5 wherein the carbon-containing substance employed comprises butane.
Claim 11
Dependent Claim
10 words
The process of claim 6 wherein the feed comprises butane.
Claim 12
Dependent Claim
81 words
A process of producing carbon particles comprising the steps of: (1) introducing a carbonaceous feed comprising C 4 -C 10 alkanes and an inert diluent into a pyrolysis zone, (2) pyrolyzing the feed in the presence of a catalyst to yield carbon, (3) removing hydrocarbon-containing effluent from the pyrolysis zone, (4) treating the effluent to remove hydrogen therefrom, and (5) recycling the treated effluent of step (4) as a carrier for fresh carbonaceous feed to replace part of the inert carrier.
Claim 13
Dependent Claim
81 words
A process of producing carbon particles comprising the steps of: (1) introducing a carbonaceous feed comprising C 4 -C 10 alkanes and an inert diluent into a pyrolysis zone, (2) pyrolyzing the feed in the presence of a catalyst to yield carbon, (3) removing hydrocarbon-containing effluent from the pyrolysis zone, (4) treating the effluent to remove hydrogen therefrom, and (5) recycling the treated effluent of step (4) as a carrier for fresh carbonaceous feed to replace part of the inert carrier.
Claim 14
Dependent Claim
22 words
The process of claim 9 wherein step (5) is repeated until all of the inert carrier has been replaced by recycled effluent.
Claim 15
Dependent Claim
18 words
The process of claim 10 comprising the additional step of removing excess recycled effluent via a slip stream.
Claim 16
Dependent Claim
18 words
The process of claim 11 wherein the excess recycled effluent is utilized as fuel for the pyrolysis reaction.
Claim 17
Dependent Claim
11 words
The process of claim 12 wherein the carbonaceous feed comprises butane.
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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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |