US3928172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic cracking of FCC gasoline and virgin naphtha
Assignee: Mobil Oil AS
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Filing: 1973-07-02
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Granted: 1975-12-23
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Expires: 1993-07-02
Abstract
Abstract A combination process is described for improving the quality and volatility of a refinery gasoline pool comprising the recracking of gasoline product of gas oil cracking and separate product recovery thereof, cracking of virgin naphtha and alkylating olefins formed in the combination process for blending with pool gasoline.
Inventors
- 👤 Jr Francis E Davis
- 👤 Richard G Graven
- 👤 Wooyoung Lee
- 👤 Robert A Sailor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:05
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/14; C10G11/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
181 words
A METHOD FOR UPGRADING HYDROCARBONS WHICH COMPRISES CRACKING A GAS OIL BOILING RANGE FEED IN A FIRST CRACKING ZONE IN THE PRESENCE OF A CRYSTALLINE ZEOLITE CRACKING CATALYST AT AN ELEVATED TEMPERATURE OF AT LEAST 850*F TO OBTAIN CONVERSION OF THE GAS OIL FEED TO MATERIALS INCLUDING A HEAVY CYCLE OIL, A LIGHT CYCLE OIL, HEAVY NAPHTHA FRACTION AND MATERIALS LOWER BOILING THAN SAID HEAVY NAPHTHA FRACTION, CRACKING THE HEAVY NAPHTHA FRACTION ABOVE OBTAINED IN A SECOND CRACKING ZONE IN THE PRESENCE OF FRESHLY REGENERATED CRYSTALLINE ZEOLITE CRACKING CATALYST AT AN ELEVATED TEMPERATURE WITHIN THE RANGE OF 850*F TO ABOUT 1000*F, SEPARATING THE PRODUCT OF SAID HEAVY, NAPHTHA FRACTION CRACKING OPERATION IN A ZONE SEPARATE FROM THE GAS OIL PRODUCT SEPARATION UNDER CONDITIONS TO RECOVER GASOLINE BOILING RANGE MATERIAL RICH IN AROMATICS AND LIGHTER HYDROCARBON MATERIAL FROM A LIGHT CYCLE OIL PRODUCT MATERIAL, COMBINING SAID LIGHT CYCLE OIL RECOVERED PRODUCTS, COMBINING MATERIALS LOWER BOILING THAN SAID HEAVY NAPHTHA PRODUCT OF GAS OIL CRACKING WITH SAID GASOLINE BOILING AND LIGHTER MATERIALS SEPARATED FROM THE PRODUCT OF SAID HEAVY NAPHTHA CRACKING OPERATION AND
Claim 2
Independent Claim
181 words
A METHOD FOR UPGRADING HYDROCARBONS WHICH COMPRISES CRACKING A GAS OIL BOILING RANGE FEED IN A FIRST CRACKING ZONE IN THE PRESENCE OF A CRYSTALLINE ZEOLITE CRACKING CATALYST AT AN ELEVATED TEMPERATURE OF AT LEAST 850*F TO OBTAIN CONVERSION OF THE GAS OIL FEED TO MATERIALS INCLUDING A HEAVY CYCLE OIL, A LIGHT CYCLE OIL, HEAVY NAPHTHA FRACTION AND MATERIALS LOWER BOILING THAN SAID HEAVY NAPHTHA FRACTION, CRACKING THE HEAVY NAPHTHA FRACTION ABOVE OBTAINED IN A SECOND CRACKING ZONE IN THE PRESENCE OF FRESHLY REGENERATED CRYSTALLINE ZEOLITE CRACKING CATALYST AT AN ELEVATED TEMPERATURE WITHIN THE RANGE OF 850*F TO ABOUT 1000*F, SEPARATING THE PRODUCT OF SAID HEAVY, NAPHTHA FRACTION CRACKING OPERATION IN A ZONE SEPARATE FROM THE GAS OIL PRODUCT SEPARATION UNDER CONDITIONS TO RECOVER GASOLINE BOILING RANGE MATERIAL RICH IN AROMATICS AND LIGHTER HYDROCARBON MATERIAL FROM A LIGHT CYCLE OIL PRODUCT MATERIAL, COMBINING SAID LIGHT CYCLE OIL RECOVERED PRODUCTS, COMBINING MATERIALS LOWER BOILING THAN SAID HEAVY NAPHTHA PRODUCT OF GAS OIL CRACKING WITH SAID GASOLINE BOILING AND LIGHTER MATERIALS SEPARATED FROM THE PRODUCT OF SAID HEAVY NAPHTHA CRACKING OPERATION AND
Claim 3
Dependent Claim
46 words
The method of claim 1 wherein a freshly regenerated crystalline aluminosilicate containing cracking catalyst is sequentially passed through said heavy naphtha cracking step, said gas oil cracking step and a virgin naphtha cracking step before stripping of the catalyst and passing stripped catalyst to catalyst regeneration.
Claim 4
Dependent Claim
26 words
The method of claim 2 wherein the cracking catalyst comprises a faujasite type of crystalline zeolite in combination with a crystalline aluminosilicate of the ZSM-5 type.
Claim 5
Dependent Claim
41 words
The method of claim 1 wherein freshly regenerated catalyst is used for recracking the heavy cracked naphtha material and the gas oil feed and catalyst used in each cracking operation is passed to a common catalyst stripping operation before being regenerated.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein recracking of said heavy naphtha fraction is accomplished in a high temperature riser cracking zone at a temperature of at least 950*F.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the recracking of said heavy naphtha fraction is accomplished in a riser cracking zone.
Claim 8
Dependent Claim
29 words
The method of claim 1 wherein recracking of said heavy naphtha fraction is accomplished in a high temperature riser cracking zone terminating in a dense fluid bed cracking zone.
Claim 9
Dependent Claim
51 words
The method of claim 1 wherein catalyst separated from said gas oil riser cracking step is used to convert a virgin naphtha at an elevated cracking temperature to improve its octane rating and the products of said virgin naphtha cracking step are separated with products of said gas oil cracking step.
Claim 10
Dependent Claim
21 words
The method of claim 1 wherein the heavy naphtha fraction subjected to recracking contains hydrocarbon components boiling up to about 500*F.
Claim 11
Dependent Claim
19 words
The method of claim 1 wherein a virgin naphtha is cracked in the presence of said heavy cracked naphtha.
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |