US4067798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic cracking process
Assignee: BP Corp North America Inc
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Filing: 1976-02-26
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Granted: 1978-01-10
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Expires: 1996-02-26
Abstract
Abstract A method for catalytically cracking an isolated reactant feed, 80-100 volume percent of which is a substantially mono-aromatic hydrocarbon fraction boiling in the boiling range of heavy gasoline and the remainder of which is a vaporizable hydrocarbon fraction, under effective cracking conditions of cracking temperature, catalyst composition, catalyst activity, catalyst-to-feed weight ratio, and weight hourly space velocity, to produce an isolated product having increased low molecular weight olefin and low molecular weight mono-aromatic contents and a reduced sulfur content and having a high octane rating.
Inventors
- 👤 Frank William Hauschildt
- 👤 Ralph J. Bertolacini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:23
CPC Classifications
C; C10; C10G; C10G35/00; C10G35/04; C10G35/10; C10G35/14; C10G2400/00; C10G2400/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
171 words
A process for converting an intermediate boiling-range hydrocarbon fraction to more valuable products by fluid catalytic cracking which comprises: a. fractionating a catalytic cracking product to separate therefrom a hydrocarbon fraction consisting of at least 40 weight percent of mono-aromatic hydrocarbons and boiling in the range from about 230° F. to about 500° F., b. preparing an isolated feed, 80 to 100 volume percent of which is the fraction from step (a) and the remainder of which is a vaporizable hydrocarbon fraction; c. catalytically cracking said isolated feed in a fluidized catalytic cracking zone under effective cracking conditions in the presence of a molecular sieve-type cracking catalyst having an equilibrium cracking activity of at least about 55 units on the Davision microactivity scale to produce an isolated hydrocarbon product; and d. recovering said isolated hydrocarbon product from the cracking zone, said isolated hydrocarbon product having increased low molecular weight olefin and low molecular weight mono-aromatic contents, a substantially reduced sulfur content, and a high octane rating relative to said isolated feed.
Claim 2
Dependent Claim
171 words
A process for converting an intermediate boiling-range hydrocarbon fraction to more valuable products by fluid catalytic cracking which comprises: a. fractionating a catalytic cracking product to separate therefrom a hydrocarbon fraction consisting of at least 40 weight percent of mono-aromatic hydrocarbons and boiling in the range from about 230° F. to about 500° F., b. preparing an isolated feed, 80 to 100 volume percent of which is the fraction from step (a) and the remainder of which is a vaporizable hydrocarbon fraction; c. catalytically cracking said isolated feed in a fluidized catalytic cracking zone under effective cracking conditions in the presence of a molecular sieve-type cracking catalyst having an equilibrium cracking activity of at least about 55 units on the Davision microactivity scale to produce an isolated hydrocarbon product; and d. recovering said isolated hydrocarbon product from the cracking zone, said isolated hydrocarbon product having increased low molecular weight olefin and low molecular weight mono-aromatic contents, a substantially reduced sulfur content, and a high octane rating relative to said isolated feed.
Claim 3
Dependent Claim
35 words
The process as set forth in claim 1 wherein said product is fractonated to separate therefrom a hydrocarbon fraction having a gasoline boiling range and having a substantially increased octane rating relative to said feed.
Claim 4
Dependent Claim
30 words
The process as set forth in claim 2 wherein the sulfur content of said hydrocarbon fraction having a gasoline boiling range is reduced by about 80% relative to said feed.
Claim 5
Dependent Claim
20 words
The process as set forth in claim 2 wherein said gasoline boiling range is from 93° F. to 430° F.
Claim 6
Dependent Claim
26 words
The process as set forth in claim 1 wherein the sulfur content of said isolated hydrocarbon product is reduced by about 40% relative to said feed.
Claim 7
Dependent Claim
25 words
The process as set forth in claim 1 wherein at least 90 volume per cent of said isolated feed is the fraction from step (a).
Claim 8
Dependent Claim
20 words
The process as set forth in claim 1 wherein all of said isolated feed is said fraction from step (a).
Claim 9
Dependent Claim
26 words
The process as set forth in claim 1 wherein said fraction from step (a) boils in the range from about 300° F. to about 450° F.
Claim 10
Dependent Claim
28 words
The process as set forth in claim 1 wherein said vaporizable hydrocarbon fraction is selected from the group consisting of a gas oil, cycle oil, and mixtures thereof.
Claim 11
Dependent Claim
23 words
The process as set forth in claim 1 wherein the weight-hourly-space velocity is in the range of from about 2 to about 200.
Claim 12
Dependent Claim
23 words
The process as set forth in claim 1 wherein the weight-hourly-space velocity is in the range of from about 2 to about 100.
Claim 13
Dependent Claim
24 words
The process as set forth in claim 1 wherein the catalyst-to-hydrocarbon weight ratio is in the range of from about 2 to about 25.
Claim 14
Dependent Claim
24 words
The process as set forth in claim 1 wherein the catalyst-to-hydrocarbon weight ratio is in the range of from about 3 to about 15.
Claim 15
Dependent Claim
25 words
The process as set forth in claim 1 wherein the cracking temperature is in the range of from about 900° F. to about 1,200° F.
Claim 16
Dependent Claim
25 words
The process as set forth in claim 1 wherein the cracking temperature is in the range of from about 950° F. to about 1,100° F.
Claim 17
Dependent Claim
25 words
The process as set forth in claim 1 wherein said molecular sieve-type cracking catalyst contains from about 13 to about 50 weight percent of alumina.
Claim 18
Dependent Claim
29 words
The process as set forth in claim 1 wherein the molecular sieve content of said catalyst is in the range of from about 1 to about 15 weight percent.
Claim 19
Dependent Claim
24 words
The process as set forth in claim 1 wherein said isolated hydrocarbon product contains an increased content of xylenes relative to said isolated feed.
Claim 20
Dependent Claim
26 words
The process as set forth in claim 1 wherein said isolated hydrocarbon product contains an increased content of butenes and propylene relative to said isolated feed.
Claim 21
Dependent Claim
33 words
The process as set forth in claim 1 wherein said isolated hydrocarbon product is fractionated to separate the fraction thereof boiling in the range of from about 280° F. to about 500° F.
Claim 22
Dependent Claim
35 words
The process as set forth in claim 20 wherein at least a portion of said separated fraction is recycled to the catalytic cracking zone as part of the mono-aromatic containing hydrocarbon fraction from step (a).
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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) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |