US4065379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of normally gaseous olefins
Assignee: Shell USA Inc
•
Filing: 1976-01-14
•
Granted: 1977-12-27
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Expires: 1996-01-14
Abstract
Abstract The invention relates to an integrated process for the production of normally gaseous olefins, starting from a petroleum residue.
Inventors
- 👤 Homi D. Soonawala
- 👤 Steven E. DEN Broeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:57
CPC Classifications
C; C10; C10G; C10G69/00; C10G69/02; C10G69/06; C10G2400/00; C10G2400/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
71 words
A process for the production of normally gaseous olefins from a petroleum residue, which comprises subjecting the petroleum residue to a thermal cracking treatment, recovering a gas oil fraction by distillation from the product of the thermal cracking treatment, catalytically hydrotreating at least a substantial part of the gas oil fraction, steam-cracking at least a substantial part of the hydrotreated product and recovering normally gaseous olefins from the effluent thus obtained.
Claim 2
Dependent Claim
71 words
A process for the production of normally gaseous olefins from a petroleum residue, which comprises subjecting the petroleum residue to a thermal cracking treatment, recovering a gas oil fraction by distillation from the product of the thermal cracking treatment, catalytically hydrotreating at least a substantial part of the gas oil fraction, steam-cracking at least a substantial part of the hydrotreated product and recovering normally gaseous olefins from the effluent thus obtained.
Claim 3
Dependent Claim
21 words
The process of claim 1, in which the starting material is an atmospheric petroleum residue with a cut-point above 330° C.
Claim 4
Dependent Claim
24 words
The process of claim 2 in which the residue is subjected to a thermal cracking treatment at a temperature between 430° and 510° C.
Claim 5
Dependent Claim
21 words
The process of claim 3 in which the thermal cracking treatment of the residue is followed by quenching the product obtained.
Claim 6
Dependent Claim
33 words
The process of claim 4 in which a C 4 - gas fraction, a naphtha fraction and a gas oil fraction are recovered by distillation from the product of the thermal cracking step.
Claim 7
Dependent Claim
21 words
The process of claim 5, in which a gas oil fraction boiling in the range from 180° C-370° C is recovered.
Claim 8
Dependent Claim
34 words
The process of claim 6, in which at least a substantial part of the gas oil fraction is subjected to a hydrotreatment in the presence of an alumina supported catalyst containing cobalt and molybdenum.
Claim 9
Dependent Claim
28 words
The process of claim 7, in which the catalytic hydrotreatment is performed at a temperature between 300° and 390° C and a pressure between 20 and 60 atmospheres.
Claim 10
Dependent Claim
25 words
The process of claim 8, in which the hydrotreated product is subjected to a steam-cracking treatment in a steam/hydrocarbon weight ratio between 0.5 and 1.1
Claim 11
Dependent Claim
30 words
The process of claim 9 in which the steam-cracking treatment is performed at a temperature between 775° C and 850° C and a residence time between 0.04 and 1.0 sec.
Claim 12
Dependent Claim
18 words
The process of claim 10, in which ethylene is recovered from the product obtained in the steam-cracking step.
References Cited (Backward Citations)
US2843530A
Cited
US3324029A
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US3755143A
Cited
US3839484A
Cited
GB1361671A
Cited
US3898299A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |