US4624771A
Expired / Lapsed
US
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Fluid catalytic cracking of vacuum residuum oil
Assignee: Texaco Inc
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Filing: 1985-09-18
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Granted: 1986-11-25
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Expires: 2005-09-18
Abstract
Abstract A mixture of hydrocarbons consisting of gas oil and residual oil is catalytically cracked in the presence of a fluidized zeolite catalyst. The mixture of hydrocarbons is classified by boiling range as a 550°-1000° F. gas oil and a 1000+° F. vacuum residuum. The gas oil is selectively cracked using a freshly regenerated fluid zeolite catalyst having less than 0.1 wt % residual carbon to give a high yield of desirable liquid hydrocarbon boiling from about 60°-670° F. The vacuum residuum is injected into the riser reactor at a point near the riser outlet to quench the cracking reactions in the gas oil. The vacuum residuum undergoes a small amount of reaction removing undesirable materials and yielding a liquid hydrocarbon boiling up to about 1000° F. The amount of vacuum residuum cracking and overall yield of liquid hydrocarbons are controlled by downstream injection of vacuum residuum into the riser.
Inventors
- 👤 Philip A. Lane
- 👤 Charles H. Schrader
- 👤 Glenn A. Clausen
- 👤 David E. Self
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:43
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/14; C10G11/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
183 words
In a fluid catalytic cracking process comprising a riser conversion zone, a catalyst separation zone and a catalyst regeneration zone, wherein the improvement comprises: a. contacting a vacuum gas oil with a regenerated cracking catalyst to form a first suspension in an initial portion of said riser conversion zone under elevated temperature hydrocarbon conversion conditions for a contacting time of about 0.5 to 1.5 seconds; b. contacting the first suspension in a down stream portion of the riser conversion zone with a vacuum residuum fraction to form a second suspension under elevated temperature hydrocarbon conversion conditions for a contacting time of about 0.25 to 0.6 seconds; c. separating cracking catalyst with deposited contaminants of hydrocarbon conversion from hydrocarbon conversion products of said vacuum gas oil and said vacuum residuum fraction in said catalyst separation zone; d. regenerating separated cracking catalyst with deposited contaminants of hydrocarbon conversion in said catalyst regeneration zone wherein said catalyst is raised to a temperature of about 1200° to 1400° F. to yield a regenerated cracking catalyst wherein deposited contaminants are reduced to about 0.1 wt % or less.
Claim 2
Dependent Claim
183 words
In a fluid catalytic cracking process comprising a riser conversion zone, a catalyst separation zone and a catalyst regeneration zone, wherein the improvement comprises: a. contacting a vacuum gas oil with a regenerated cracking catalyst to form a first suspension in an initial portion of said riser conversion zone under elevated temperature hydrocarbon conversion conditions for a contacting time of about 0.5 to 1.5 seconds; b. contacting the first suspension in a down stream portion of the riser conversion zone with a vacuum residuum fraction to form a second suspension under elevated temperature hydrocarbon conversion conditions for a contacting time of about 0.25 to 0.6 seconds; c. separating cracking catalyst with deposited contaminants of hydrocarbon conversion from hydrocarbon conversion products of said vacuum gas oil and said vacuum residuum fraction in said catalyst separation zone; d. regenerating separated cracking catalyst with deposited contaminants of hydrocarbon conversion in said catalyst regeneration zone wherein said catalyst is raised to a temperature of about 1200° to 1400° F. to yield a regenerated cracking catalyst wherein deposited contaminants are reduced to about 0.1 wt % or less.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the first suspension reaches a temperature of about 1000° to 1200° F. before contacting with said vacuum residuum fraction.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein said second suspension reaches a temperature of about 900° to 975° F. before separating.
Claim 5
Dependent Claim
27 words
The process of claim 1 wherein the downstream portion of the riser conversion zone is the last 10 to 20 vol % of the riser conversion zone.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein the relative amount of vacuum residuum fraction to (vacuum residuum fraction+vacuum gas oil) is about 5 to 20 wt %.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein the relative amount of vacuum residuum fraction to (vacuum residuum fraction+vacuum gas oil) is 10 to 15 wt %.
Claim 8
Independent Claim
94 words
A method of cracking a vacuum residuum fraction to produce gasoline and lower boiling products which comprises: a. contacting a vacuum gas oil with a fluidized cracking catalyst for a contacting time of 0.5 to 1.5 seconds, said cracking catalyst at an initial contacting temperature of about 1000° to 1200° F.; b. contacting said fluidized cracking catalyst and vacuum gas oil with a vacuum residuum fraction for a contacting time of about 0.2 to 0.6 seconds; c. separating said cracking catalyst from cracked products of said vacuum residuum fraction and said vacuum gas oil.
Claim 9
Independent Claim
94 words
A method of cracking a vacuum residuum fraction to produce gasoline and lower boiling products which comprises: a. contacting a vacuum gas oil with a fluidized cracking catalyst for a contacting time of 0.5 to 1.5 seconds, said cracking catalyst at an initial contacting temperature of about 1000° to 1200° F.; b. contacting said fluidized cracking catalyst and vacuum gas oil with a vacuum residuum fraction for a contacting time of about 0.2 to 0.6 seconds; c. separating said cracking catalyst from cracked products of said vacuum residuum fraction and said vacuum gas oil.
Claim 10
Dependent Claim
22 words
The method of claim 7 wherein the fluidized cracking catalyst of step a contains less than 0.1 wt % deposited carbon contaminants.
Claim 11
Dependent Claim
26 words
The process of claim 7 wherein the relative amount of vacuum residuum fraction to (vacuum residuum fraction+vacuum gas oil) is about 5 of 20 wt %.
Claim 12
Dependent Claim
24 words
The process of claim 7 wherein the relative amount of vacuum residuum to (vacuum residuum fraction+vacuum gas oil) is 10 to 15 wt %.
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) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |