US4479869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible feed pyrolysis process
Assignee: MW KELLOGG COMPANY (A DE CORP FORMED IN 1987)
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Filing: 1983-12-14
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Granted: 1984-10-30
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Expires: 2003-12-14
Abstract
Abstract Hydrocarbon feed to a steam cracking furnace is heated to near cracking temperature by indirect heat exchange with steam to permit use of a range of feedstocks.
Inventors
- 👤 William C. Petterson
- 👤 Larry G. Hackemesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:50
CPC Classifications
C; C10; C10G; C10G9/00; C10G9/14; C10G9/34; C10G9/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
In a process for steam cracking hydrocarbon feed in a tubular, fired furnace having a radiant section and a convection section wherein dilution steam is added to the hydrocarbon feed and the resulting mixed feed of dilution steam and hydrocarbon feed is heated to near incipient cracking temperature prior to introduction of the mixed feed to the radiant section, the improvement which comprises heating the hydrocarbon feed within the temperature range from about 370° C. to about 700° C. by indirect heat exchange with superheated steam and at least a portion of the superheated steam is generated in the convection section of said tubular, fired furnace.
Claim 2
Dependent Claim
106 words
In a process for steam cracking hydrocarbon feed in a tubular, fired furnace having a radiant section and a convection section wherein dilution steam is added to the hydrocarbon feed and the resulting mixed feed of dilution steam and hydrocarbon feed is heated to near incipient cracking temperature prior to introduction of the mixed feed to the radiant section, the improvement which comprises heating the hydrocarbon feed within the temperature range from about 370° C. to about 700° C. by indirect heat exchange with superheated steam and at least a portion of the superheated steam is generated in the convection section of said tubular, fired furnace.
Claim 3
Dependent Claim
48 words
The process of claim 1 wherein the hydrocarbon feed is selected from the group consisting of ethane, propane, or mixtures thereof and the mixed feed is heated by indirect heat exchange with superheated steam to a temperature within the range from about 600° C. to about 700° C.
Claim 4
Dependent Claim
50 words
The process of claim 1 wherein the hydrocarbon feed is naphtha having an end point between about 150° C. and about 250° C. and the mixed feed is heated by indirect heat exchange with superheated steam to a temperature within the range from about 430° C. to about 650° C.
Claim 5
Dependent Claim
51 words
The process of claim 1 wherein the hydrocarbon feed is gas oil having an end point between about 290° C. and about 570° C. and the mixed feed is heated by indirect heat exchange with superheated steam to a temperature within the range from about 450° C. to about 570° C.
Claim 6
Dependent Claim
34 words
The process of claim 1 wherein the process for steam cracking additionally comprises a cracked gas quench boiler for raising at least a portion of the steam that is superheated in the convection section.
References Cited (Backward Citations)
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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) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |