US4169782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visbreaking process
Assignee: Honeywell UOP LLC
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Filing: 1978-01-06
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Granted: 1979-10-02
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Expires: 1998-01-06
Abstract
Abstract A process for visbreaking a heavy petroleum fraction wherein the effluent of the visbreaking heater is quenched by admixture with an overhead liquid produced by condensation of the overhead vapors of a secondary flash zone. The visbreaker effluent is then passed into a rectified flash zone, with the bottoms liquid of the rectified flash zone forming the feed stream to the secondary flash zone.
Inventors
- 👤 H. Lytle Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:52
CPC Classifications
C; C10; C10G; C10G9/00; C10G9/002; C10G9/007
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
334 words
A process for thermally treating a heavy hydrocarbonaceous charge stock which comprises the steps of: (a) passing a feed stream comprising petroleum derived hydrocarbonaceous compounds having an API gravity of less than 20.0° and having a 10% distillation temperature over 250° C. through a visbreaking heater operated at visbreaking conditions, and effecting the cracking of hydrocarbonaceous compounds and the production of a visbreaker effluent stream; (b) cooling the visbreaker effluent stream at least 30 Centigrade degrees by admixing the visbreaker effluent stream with a quench stream; (c) passing the visbreaker effluent stream into a rectified flash zone operated with a bottom temperature within the range of 365° C. to 460° C. and a pressure of from 45 psig. to 150 psig.; (d) withdrawing a distillate sidecut stream from the rectified flash zone at a first intermediate point and returning at least a portion of the distillate sidecut stream to the rectified flash zone at a second, higher intermediate point; (e) withdrawing an overhead vapor stream from the rectified flash zone, condensing at least a portion of the overhead stream to form a first overhead liquid, and passing a stream of the first overhead liquid into a fractionation column; (f) withdrawing a liquid bottoms stream from the rectified flash zone, and flashing the liquid bottoms stream in a secondary flash zone maintained at flashing conditions including a pressure at least 30 psig. less than that maintained in the rectified flash zone; (g) withdrawing a residue liquid stream from the bottom of the secondary flash zone, and removing at least a portion of the residue liquid stream from the process as a product; and (h) condensing overhead vapors removed from the secondary flash zone to form a second overhead liquid having a temperature less than 150° C., passing a first stream of the second overhead liquid into the secondary flash zone and admixing a second stream of the second overhead liquid with a portion of the distillate sidecut stream as the quench stream of step (b).
Claim 2
Dependent Claim
334 words
A process for thermally treating a heavy hydrocarbonaceous charge stock which comprises the steps of: (a) passing a feed stream comprising petroleum derived hydrocarbonaceous compounds having an API gravity of less than 20.0° and having a 10% distillation temperature over 250° C. through a visbreaking heater operated at visbreaking conditions, and effecting the cracking of hydrocarbonaceous compounds and the production of a visbreaker effluent stream; (b) cooling the visbreaker effluent stream at least 30 Centigrade degrees by admixing the visbreaker effluent stream with a quench stream; (c) passing the visbreaker effluent stream into a rectified flash zone operated with a bottom temperature within the range of 365° C. to 460° C. and a pressure of from 45 psig. to 150 psig.; (d) withdrawing a distillate sidecut stream from the rectified flash zone at a first intermediate point and returning at least a portion of the distillate sidecut stream to the rectified flash zone at a second, higher intermediate point; (e) withdrawing an overhead vapor stream from the rectified flash zone, condensing at least a portion of the overhead stream to form a first overhead liquid, and passing a stream of the first overhead liquid into a fractionation column; (f) withdrawing a liquid bottoms stream from the rectified flash zone, and flashing the liquid bottoms stream in a secondary flash zone maintained at flashing conditions including a pressure at least 30 psig. less than that maintained in the rectified flash zone; (g) withdrawing a residue liquid stream from the bottom of the secondary flash zone, and removing at least a portion of the residue liquid stream from the process as a product; and (h) condensing overhead vapors removed from the secondary flash zone to form a second overhead liquid having a temperature less than 150° C., passing a first stream of the second overhead liquid into the secondary flash zone and admixing a second stream of the second overhead liquid with a portion of the distillate sidecut stream as the quench stream of step (b).
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the visbreaker effluent stream is also cooled by admixture with a portion of the residue liquid stream.
Claim 4
Dependent Claim
40 words
The process of claim 2 wherein the stream of the first overhead liquid which is passed into the fractionation column is separated therein into a naphtha bottoms stream and an overhead stream vapor stream comprising C 1 -C 4 hydrocarbons.
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) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |