US3843744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlling coke in the pyrolysis of hydrocarbons to acetylene and hydrogen
Assignee: Individual
•
Filing: 1972-02-14
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Granted: 1974-10-22
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Expires: 1992-02-14
Abstract
Abstract A method for controlling and diminishing the formation of coke on the walls of reactors wherein hydrocarbons are undergoing pyrolysis and especially pyrolysis for formation of acetylene, which comprises injection of steam and/or an inert gas at at least one critically located point in the system downstream from the feed injection. The improvement step prolongs the period of introduction of feed to the pyrolysis by reducing the frequency of feed interruption in order to remove coke build-up.
Inventors
- 👤 L Kramer
- 👤 J Happel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:20
CPC Classifications
C; C10; C10G; C10G9/00; C10G9/14; C10G9/16; C01; C01B; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/36; C01B3/363; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/95
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
95 words
A PROCESS FOR THE CONTROL OF COKE PRODUCED IN HYDROCARBON PYROLYSIS REACTORS WHEREIN HYDROCARBONS UNDERGO PYROLYSIS TO ACETYLENE CONTAINING PYROLYSIS PRODUCTS, BY INJECTION OF A SUPPLEMENTARY GAS STREAM SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, STEAM AND MIXTURES THEREOF, SAID GAS STREAM BEING AT A TEMPERATURE ABOVE 750*C. BUT LOWER THAN THE TEMPERATURE OF THE PYROLYSIS PRODUCTS AT THE LOCATION OF INJECTION INTO THE REACTOR SYSTEM AT A LOCATION DOWNSTREAM FROM THAT AT WHICH SUBSTANTIALLY ALL THE PYROLYSIS REACTION HAS BEEN COMPLETED BUT PRIOR TO THE POINT AT WHICH THE SAID PYROLYSIS PRODUCTS ARE QUENCHED.
Claim 2
Dependent Claim
95 words
A PROCESS FOR THE CONTROL OF COKE PRODUCED IN HYDROCARBON PYROLYSIS REACTORS WHEREIN HYDROCARBONS UNDERGO PYROLYSIS TO ACETYLENE CONTAINING PYROLYSIS PRODUCTS, BY INJECTION OF A SUPPLEMENTARY GAS STREAM SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, STEAM AND MIXTURES THEREOF, SAID GAS STREAM BEING AT A TEMPERATURE ABOVE 750*C. BUT LOWER THAN THE TEMPERATURE OF THE PYROLYSIS PRODUCTS AT THE LOCATION OF INJECTION INTO THE REACTOR SYSTEM AT A LOCATION DOWNSTREAM FROM THAT AT WHICH SUBSTANTIALLY ALL THE PYROLYSIS REACTION HAS BEEN COMPLETED BUT PRIOR TO THE POINT AT WHICH THE SAID PYROLYSIS PRODUCTS ARE QUENCHED.
Claim 3
Dependent Claim
12 words
The process according to claim 1 wherein the gas injected is steam.
Claim 4
Dependent Claim
12 words
The process according to claim 1 wherein the gas injected is hydrogen.
Claim 5
Dependent Claim
17 words
The process according to claim 1 wherein the gas injected is a mixture of steam and hydrogen.
Claim 6
Dependent Claim
38 words
The process according to claim 1 wherein the gas stream is injected at a location between that point at which the maximum reactor profile temperature occurs and that point at which ''''sheet coke'''' forms under conventional operating conditions.
Claim 7
Dependent Claim
71 words
In a process for pyrolysis of hydrocarbons to acetylene, the improvement which comprises injection of a supplementary gas stream selected from the group consisting of hydrogen, steam, and mixtures thereof, into the reactor at a location downstrEam from that at which substantially all the pyrolysis reaction has been completed but prior to the point of quenching whereby production of coke is controlled and the duration of the pyrolysis cycle is increased.
Claim 8
Dependent Claim
71 words
In a process for pyrolysis of hydrocarbons to acetylene, the improvement which comprises injection of a supplementary gas stream selected from the group consisting of hydrogen, steam, and mixtures thereof, into the reactor at a location downstrEam from that at which substantially all the pyrolysis reaction has been completed but prior to the point of quenching whereby production of coke is controlled and the duration of the pyrolysis cycle is increased.
Claim 9
Dependent Claim
12 words
The improvement of claim 6 in which the supplementary stream is steam.
Claim 10
Dependent Claim
12 words
The improvement of claim 6 in which the supplementary stream is hydrogen.
Claim 11
Dependent Claim
17 words
The improvement of claim 6 in which the supplementary stream is a mixture of steam and hydrogen.
Claim 12
Dependent Claim
58 words
The process of claim 1 wherein after overall reactor coking occurs, at least a portion of the said supplementary gas stream is diverted to the pyrolysis reactor feed inlet, and is allowed to flow through the pyrolysis reactor until coke is removed from the entire reactor and then re-establishing the original feed and supplementary gas stream flow pattern.
Claim 13
Dependent Claim
21 words
The process of claim 10 wherein the feed stream to the reactor is interrupted prior to diverting the supplementary gas stream.
Claim 14
Dependent Claim
47 words
The process of claim 7, wherein after overall reactor coking occurs, at least part of the supplementary gas stream is diverted to the reactor inlet, and is allowed to flow until coke is removed from the entire reactor followed by re-establishment of the original feed flow pattern.
Claim 15
Dependent Claim
21 words
The process of claim 12 wherein the feed stream to the reactor is interrupted prior to diverting the supplementary gas stream.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |