US4358363A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for enhancing catalytic activity
Assignee: Mobil Oil AS
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Filing: 1981-01-15
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Granted: 1982-11-09
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Expires: 2001-01-15
Abstract
Abstract A waxy fuel oil that contains a catalytically deleterious contaminant is treated with a crystalline zeolite under sorption conditions followed by catalytic dewaxing with a crystalline zeolite exemplified by ZSM-5 to produce dewaxed fuel oil and high octane gasoline.
Inventors
- 👤 Fritz A. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:58
CPC Classifications
C; C10; C10G; C10G67/00; C10G67/02; C10G67/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
190 words
A process for reducing the pour point of a waxy hydrocarbon fuel oil that boils in the range of about 350° to about 1025° F. and that contains a catalytically deleterious impurity, which process comprises: contacting said hydrocarbon oil with a sorbent comprising a first molecular sieve zeolite having a Constraint Index of about 1 to 12 and a dried crystal density in the hydrogen form of not less than about 1.6 grams per cubic centimeter, said contacting being under sorption conditions effective to remove a substantial fraction of said deleterious impurity and thereby forming a refined waxy oil; contacting said refined waxy oil and hydrogen gas under dewaxing conditions that include a temperature of about 725° to 1000° F. with a catalyst consisting of a second molecular sieve zeolite having a Constraint Index of about 1 to 12 and a dried crystal density in the hydrogen form of not less than about 1.6 grams per cubic centimeter, thereby forming a dewaxed fuel oil admixed with a gasoline fraction having a clear research octane number greater than about 86; and recovering separately said dewaxed fuel oil and said gasoline fraction.
Claim 2
Dependent Claim
190 words
A process for reducing the pour point of a waxy hydrocarbon fuel oil that boils in the range of about 350° to about 1025° F. and that contains a catalytically deleterious impurity, which process comprises: contacting said hydrocarbon oil with a sorbent comprising a first molecular sieve zeolite having a Constraint Index of about 1 to 12 and a dried crystal density in the hydrogen form of not less than about 1.6 grams per cubic centimeter, said contacting being under sorption conditions effective to remove a substantial fraction of said deleterious impurity and thereby forming a refined waxy oil; contacting said refined waxy oil and hydrogen gas under dewaxing conditions that include a temperature of about 725° to 1000° F. with a catalyst consisting of a second molecular sieve zeolite having a Constraint Index of about 1 to 12 and a dried crystal density in the hydrogen form of not less than about 1.6 grams per cubic centimeter, thereby forming a dewaxed fuel oil admixed with a gasoline fraction having a clear research octane number greater than about 86; and recovering separately said dewaxed fuel oil and said gasoline fraction.
Claim 3
Dependent Claim
31 words
The process described in claim 1 wherein said first and said second molecular sieve zeolites are individually selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 and ZSM-48.
Claim 4
Dependent Claim
22 words
The process described in claim 2 wherein said first and second molecular sieve zeolites are both ZSM-5 or ZSM-11 or intergrowths thereof.
Claim 5
Dependent Claim
36 words
The process described in claim 1 wherein said dewaxing conditions include a LHSV of 0.1 to 10 and the LHSV for the sorption step is equal to or less than the LHSV for the dewaxing step.
Claim 6
Dependent Claim
36 words
The process described in claim 2 wherein said dewaxing conditions include a LHSV of 0.1 to 10 and the LHSV for the sorption step is equal to or less than the LHSV for the dewaxing step.
Claim 7
Dependent Claim
36 words
The process described in claim 3 wherein said dewaxing conditions include a LHSV of 0.1 to 10 and the LHSV for the sorption step is equal to or less than the LHSV for the dewaxing step.
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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) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |