Patent US2148363A successfully refreshed from Google Patents.
Patent US4340464A successfully refreshed from Google Patents.
US4340464A
Expired / Lapsed
US
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Method for thermal cracking of heavy petroleum oil
Assignee: Kureha Corp
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Filing: 1980-01-17
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Granted: 1982-07-20
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Expires: 2000-01-17
Abstract
Abstract Disclosed is a method for the thermal cracking of a heavy petroleum oil to produce a pitch with a high aromaticity having a high softening point, the ratio of H/C of about 0.4 to 1.1 and the fraction insoluble in n-heptane but soluble in quinoline of higher than 55% by weight and an oil mainly composed of aliphatic hydrocarbon by feeding the heavy petroleum oil into a reaction system and bringing it therein into contact with a gas which does not react with the heavy petroleum oil, of a temperature in the range of from 400 DEG C. to 2000 DEG C., which method is improved by using, as the reaction system, a plurality of reaction vessels arranged in series and having their interior temperatures successively lower by a fixed step in the direction of the transfer of the charge.
Inventors
- 👤 Takaaki Aiba
- 👤 Hisatsugu Kaji
- 👤 Tomizo Endo
- 👤 Takao Ishihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:52
CPC Classifications
C; C10; C10G; C10G51/00; C10G51/02; C10G51/023; C10C; C10C3/00; C10C3/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
225 words
In the method for the thermal cracking of a heavy petroleum oil wherein the heavy petroleum oil is preheated to a temperature of 450° to 520° C. and introduced into a reaction system, where the heavy petroleum oil is then subjected to thermal cracking under conditions of a temperature of 350° to 450° C., a pressure of 300 mmHg to 15 kg/cm 2 and a residence time of 1 to 10 hours, the improvement wherein (a) the heavy petroleum oil is introduced into a reaction system comprising a plurality of reaction vessels arranged in series; and (b) the interior of each of said plurality of reaction vessels arranged in series is maintained at a temperature which is 5° to 50° C. lower than the interior temperature of the preceding reaction vessel by contacting the heavy petroleum oil in each vessel with a gaseous thermal medium which does not react with the oil at a temperature of 400° to 2000° C. and controlling the volume of the gaseous thermal medium introduced into each vessel, thereby suppressing the formation of coke on the inner walls of said reaction vessels and forming a high aromatic and uniform pitch of the ratio of H/C of 0.4 to 1.1, of a content of n-heptane-insoluble and quinoline-soluble fraction of more than 55% and of a softening point of about 170° C.
Claim 2
Dependent Claim
225 words
In the method for the thermal cracking of a heavy petroleum oil wherein the heavy petroleum oil is preheated to a temperature of 450° to 520° C. and introduced into a reaction system, where the heavy petroleum oil is then subjected to thermal cracking under conditions of a temperature of 350° to 450° C., a pressure of 300 mmHg to 15 kg/cm 2 and a residence time of 1 to 10 hours, the improvement wherein (a) the heavy petroleum oil is introduced into a reaction system comprising a plurality of reaction vessels arranged in series; and (b) the interior of each of said plurality of reaction vessels arranged in series is maintained at a temperature which is 5° to 50° C. lower than the interior temperature of the preceding reaction vessel by contacting the heavy petroleum oil in each vessel with a gaseous thermal medium which does not react with the oil at a temperature of 400° to 2000° C. and controlling the volume of the gaseous thermal medium introduced into each vessel, thereby suppressing the formation of coke on the inner walls of said reaction vessels and forming a high aromatic and uniform pitch of the ratio of H/C of 0.4 to 1.1, of a content of n-heptane-insoluble and quinoline-soluble fraction of more than 55% and of a softening point of about 170° C.
Claim 3
Dependent Claim
17 words
The method according to claim 1 wherein the number of said reaction vessels is 2 to 5.
Claim 4
Dependent Claim
13 words
The method according to claim 1, wherein the gaseous thermal medium is steam.
References Cited (Backward Citations)
GB332913A
Cited
US2234910A
Cited
US2416023A
Cited
US2813824A
Cited
US3928170A
Cited
US4080283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |