US4080283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for continuous production of pitch
Assignee: Koa Oil Co Ltd
•
Filing: 1977-04-28
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Granted: 1978-03-21
•
Expires: 1997-04-28
Abstract
Abstract Pitch is produced continuously by heat treating a heavy hydrocarbon oil at a temperature of 350° to 500° C successively in two or more reactors connected in series, outlet to inlet, recirculating, at the same time, one portion of the liquid output substance from at least one reactor into that reactor, and introducing the output substance (molten pitch) of the final reactor into an after-treatment chamber of duct shape with an inactive atmosphere sealed therewithin thereby to cool the output substance.
Inventors
- 👤 Kosaku Noguchi
- 👤 Kiyoharu Yoshimura
- 👤 Honami Tanaki
- 👤 Reijiro Nishiyama
- 👤 Akio Mimura
- 👤 Jousuke Sato
- 👤 Kiyohiko Koizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:13
CPC Classifications
C; C10; C10C; C10C1/00; C10C1/19; C10C3/00; C10C3/002
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
65 words
A process for continuous production of pitch which comprises heat treating a heavy hydrocarbon oil at a temperature in the range of 350° to 500° C successively in a plurality of reactors connected in series arrangement and at the same time, recirculating one portion of the liquid output substance from at least one reactor of said plurality of reactors into said at least one reactor.
Claim 2
Dependent Claim
65 words
A process for continuous production of pitch which comprises heat treating a heavy hydrocarbon oil at a temperature in the range of 350° to 500° C successively in a plurality of reactors connected in series arrangement and at the same time, recirculating one portion of the liquid output substance from at least one reactor of said plurality of reactors into said at least one reactor.
Claim 3
Dependent Claim
33 words
A process for continuous production of pitch as claimed in claim 1 in which one portion of the liquid output substance from each of said plurality of reactors is recirculated into that reactor.
Claim 4
Dependent Claim
37 words
A process for continuous production of pitch as claimed in claim 1 in which said one portion of the liquid output substance from said at least one reactor is thus recirculated into said reactor after being reheated.
Claim 5
Dependent Claim
63 words
A process for continuous production of pitch as claimed in claim 1 in which the heavy hydrocarbon oil is first introduced into a heater together with steam supplied at a rate of 0.1 to 5 percent by weight of the heavy hydrocarbon oil, and is thus preheated to a temperature of 350° to 500° C prior to being introduced into the first reactor.
Claim 6
Dependent Claim
45 words
A process for continuous production of pitch as claimed in claim 1 further comprising an after-treatment step of introducing the output substance from the final reactor into an after-treatment chamber of duct shape with an inactive atmosphere sealed therein thereby to cool said output substance.
Claim 7
Dependent Claim
52 words
A process for continuous production of pitch as claimed in claim 5 in which, in the after-treatment step, the output substance is introduced into the after-treatment chamber at a part thereof which, together with the vicinity thereof, is maintained at a constant temperature, heating being resorted to if necessary for this purpose.
Claim 8
Dependent Claim
28 words
A process for continuous production of pitch as claimed in claim 5 in which the interior of the after-treatment chamber is maintained under reduced pressure during the process.
Claim 9
Dependent Claim
55 words
A process for continuous production of pitch as claimed in claim 1 in which the heavy hydrocarbon oil is a member selected from the group consisting of atmospheric distillation residue oils, vacuum distillation residue oils, residue oils of thermal cracking and catalytic cracking, deasphalting residue oils, natural asphalts, shale oil, coal tars, and mixtures thereof.
Claim 10
Dependent Claim
55 words
A process for continuous production of pitch as claimed in claim 5 in which the heavy hydrocarbon oil is a member selected from the group consisting of atmospheric distillation residue oils, vacuum distillation residue oils, residue oils of thermal cracking and catalytic cracking, deasphalting residue oils, natural asphalts, shale oil, coal tars, and mixtures thereof.
Claim 11
Dependent Claim
29 words
A process for continuous production of pitch as claimed in claim 1 in which the temperatures within the reactors are maintained within the range of 400° to 450° C.
Claim 12
Dependent Claim
32 words
A process for continuous production of pitch as claimed in claim 5 in which the temperature within at least the first reactor is maintained within the range of 400° to 450° C.
Claim 13
Dependent Claim
33 words
A process for continuous production of pitch as claimed in claim 4 in which the steam is supplied at a rate of 0.3 to 3 percent by weight of the heavy hydrocarbon oil.
Claim 14
Dependent Claim
38 words
A process as claimed in claim 1 in which the recirculation flow rate R is such that the value V/R will become 1 hour or less wherein V denotes the retention volume of said at least one reactor.
Claim 15
Dependent Claim
23 words
A process as claimed in claim 13 in which said value V/R is set within the range of from 5 to 30 minutes.
References Cited (Backward Citations)
US2752290A
Cited
US2756186A
Cited
US3140248A
Cited
US3318801A
Cited
US3928170A
Cited
US4014781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |