Patent US4394250A successfully refreshed from Google Patents.
US4394250A
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Delayed coking process
Assignee: Chevron USA Inc
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Filing: 1982-01-21
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Granted: 1983-07-19
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Expires: 2002-01-21
Abstract
Abstract A catalytic delayed coking process is disclosed that gives increased distillate yield and reduced coke make. The process involves adding small amounts of cracking catalyst and hydrogen to the hydrocarbon feedstock before it is charged to the coking drum. The catalyst settles out in the coke and does not affect the utility of the coke.
Inventors
- 👤 Arnold L. Grossberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:22
CPC Classifications
C; C10; C10B; C10B57/00; C10B57/04; C10B57/06; C10B55/00; C10G; C10G47/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
In a delayed coking process comprising heating a hydrocarbon feedstock to cracking temperatures and thereafter introducing the heated feedstock into a coking drum under delayed coking conditions wherein the heated feedstock soaks in the drum in its contained heat which is sufficient to convert the feedstock to cracked vapors and coke, the improvement comprising adding a cracking catalyst in an amount in the range of about 0.1 to about 3% by weight based on the hydrocarbon feedstock and hydrogen in an amount in the range of about 50 to about 500 SCF per barrel of the hydrocarbon feedstock to the feedstock thereby causing an increase in the distillate yield from the process.
Claim 2
Dependent Claim
112 words
In a delayed coking process comprising heating a hydrocarbon feedstock to cracking temperatures and thereafter introducing the heated feedstock into a coking drum under delayed coking conditions wherein the heated feedstock soaks in the drum in its contained heat which is sufficient to convert the feedstock to cracked vapors and coke, the improvement comprising adding a cracking catalyst in an amount in the range of about 0.1 to about 3% by weight based on the hydrocarbon feedstock and hydrogen in an amount in the range of about 50 to about 500 SCF per barrel of the hydrocarbon feedstock to the feedstock thereby causing an increase in the distillate yield from the process.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein the catalyst is added to the feedstock before the feedstock is heated and the hydrogen is added to the feedstock after the feedstock is heated.
Claim 4
Dependent Claim
32 words
The process of claim 1 wherein the feedstock is heated to 850° F. to 1100° F. and the delayed coking conditions are 20 to 200 psig and 800° F. to 1200° F.
Claim 5
Dependent Claim
39 words
The process of claim 2 wherein the feedstock is heated to 850° F. to 1100° F., the delayed coking conditions are 20 to 200 psig and 800° F. to 1200° F., and the catalyst is fluid catalytic cracking fines.
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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) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |