Patent US3674679A successfully refreshed from Google Patents.
US3674679A
Expired / Lapsed
US
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Process and apparatus for the thermal cracking of heavy hydrocarbon oils
Assignee: Kureha Corp
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Filing: 1970-02-24
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Granted: 1972-07-04
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Expires: 1990-02-24
Abstract
Abstract Improvement in thermal cracking of heavy hydrocarbon oils comprising the introduction of a moving film of falling oil on the surfaces of the reaction zone. Apparatus to accomplish this effect is also disclosed The moving oil film prevents the formation of coke otherwise resulting from contact between the heated reactor walls and normally liquid reaction products.
Inventors
- 👤 Koichi Washimi
- 👤 Masaaki Kanbayashi
- 👤 Toshio Kanai
- 👤 Akihiro Fujimori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:36
CPC Classifications
C; C10; C10G; C10G9/00; C10G9/34; C10G9/36; C10G2400/00; C10G2400/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
30 words
The apparatus of claim 1 wherein said inlet means are connected to circulating means for circulating at least a portion of a hydrocarbon oil produced in the thermal cracking operation.
Claim 2
Dependent Claim
26 words
The apparatus of claim 1 wherein a plurality of additional inlet means for introducing a quenching fluid are provided in the walls of said reaction zone.
Claim 3
Dependent Claim
39 words
The apparatus of claim 3 wherein said additional inlet means are positioned at spaced points along the length of the reaction zone such that the reaction time may be controlled by the selective introduction of quenching medium through them.
Claim 4
Dependent Claim
30 words
The apparatus of claim 4 wherein said additional inlet means are connected to means for circulating at least a portion of a hydrocarbon oil produced in the thermal cracking operation.
Claim 5
Dependent Claim
50 words
The apparatus of claim 1 wherein additional inlet means are positioned between the mixing zone and said inlet means for the introduction of a gaseous medium, said additional inlet means being so disposed that the gaseous medium is directed along the wall in the same direction as said hydrocarbon oil.
Claim 6
Dependent Claim
129 words
In a process for thermally cracking a heavy hydrocarbon oil comprising admixing said oil with a gaseous heating medium which has been heated to above 800*C., causing the resulting mixture to flow downwardly through a vertical chamber defining a reaction zone in order to form normally liquid and gaseous reaction products, quenching the reaction mixture upon substantial completion of the reaction, separating the quenched liquid and gaseous products and recovering said products, the improvement which comprises introducing a liquid hydrocarbon oil to the reaction zone such that the walls defining said zone are continuously wetted by a moving film of the liquid hydrocarbon oil, thereby precluding any significant formation of coke upon said walls of the reaction zone due to the contact of normally liquid products with said walls.
Claim 7
Dependent Claim
33 words
The process of claim 7 wherein said liquid hydrocarbon oil is introduced at a rate such that it does not absorb sufficient heat to exceed the temperature at which it is thermally stable.
Claim 8
Dependent Claim
18 words
The process of claim 7 wherein the liquid hydrocarbon oil comprises, at least in part, recirculated liquid product.
Claim 9
Dependent Claim
16 words
The process of claim 7 wherein recirculated liquid product is employed to quench the reaction mixture.
Claim 10
Dependent Claim
60 words
The process of claim 7 wherein an additional gaseous medium heated to above 800*C. is introduced along said wall of the reaction zone at a point above the introduction of said liquid hydrocarbon oil, thereby preventing the formation of coke at the wall boundary between the high temperature mixing zone and the point of introduction of the liquid hydrocarbon oil.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |