US4483760A
Expired / Lapsed
US
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Process for dewaxing middle distillates
Assignee: Mobil Oil AS
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Filing: 1983-06-30
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Granted: 1984-11-20
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Expires: 2003-06-30
Abstract
Abstract A process is provided for catalytically dewaxing a middle distillate with a ZSM-5 type catalyst. In this process the olefinic by-product is separated and catalytically converted to additional fuel oil and gasoline of good quality.
Inventors
- 👤 Samuel A. Tabak
- 👤 Robert E. Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:17
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/58; C10G45/60; C10G45/64; C10G65/00; C10G65/02; C10G65/04; C10G65/043
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
217 words
In a process for catalytically dewaxing a hydrocarbonaceous fuel oil feed boiling within the range of about 500° F. to about 1050° F., which process comprises contacting said feed under dewaxing conditions with a crystalline aluminosilicate zeolite having a Constraint Index of 1 to 12 and a silica to alumina ratio of at least 12 thereby forming a dewaxed fuel oil having a reduced pour point and a by-product fraction that contains olefins, said fraction boiling up to about 415° F. and containing more than about 40 wt% of hydrocarbons boiling in the C 5 to 415° F. range, the improvement, whereby the yield of dewaxed oil is increased, which comprises: separating said by-product fraction including contained olefins from said dewaxed fuel oil; and converting said separated by-product fraction by contact with a crystalline zeolite catalyst having a Constraint Index of 1 to 12 and a silica to alumina ratio of at least about 12 under a combination of reaction conditions that include a temperature of about 400° F. to about 900° F., a pressure of 15 to 2000 psig, and a LHSV of about 0.2 to 10, said combination of conditions being effective to decrease the specific volume of the C 5 + to 330° F. cut of said by-product fraction by at least 0.05 cc/g.
Claim 2
Dependent Claim
217 words
In a process for catalytically dewaxing a hydrocarbonaceous fuel oil feed boiling within the range of about 500° F. to about 1050° F., which process comprises contacting said feed under dewaxing conditions with a crystalline aluminosilicate zeolite having a Constraint Index of 1 to 12 and a silica to alumina ratio of at least 12 thereby forming a dewaxed fuel oil having a reduced pour point and a by-product fraction that contains olefins, said fraction boiling up to about 415° F. and containing more than about 40 wt% of hydrocarbons boiling in the C 5 to 415° F. range, the improvement, whereby the yield of dewaxed oil is increased, which comprises: separating said by-product fraction including contained olefins from said dewaxed fuel oil; and converting said separated by-product fraction by contact with a crystalline zeolite catalyst having a Constraint Index of 1 to 12 and a silica to alumina ratio of at least about 12 under a combination of reaction conditions that include a temperature of about 400° F. to about 900° F., a pressure of 15 to 2000 psig, and a LHSV of about 0.2 to 10, said combination of conditions being effective to decrease the specific volume of the C 5 + to 330° F. cut of said by-product fraction by at least 0.05 cc/g.
Claim 3
Dependent Claim
20 words
The process described in claim 1 including the step of recovering fuel oil and gasoline from said converted by-product fraction.
Claim 4
Dependent Claim
13 words
The process described in claim 1 wherein said feed is a petroleum distillate.
Claim 5
Dependent Claim
13 words
The process described in claim 2 wherein said feed is a petroleum distillate.
Claim 6
Dependent Claim
46 words
The process described in claim 1 or 2 or 3 or 4 wherein said converting of said by-product fraction is conducted in the presence of hydrogen gas with a crystalline zeolite selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-21, ZSM-23, ZSM-35, ZSM-38 and ZSM-48.
Claim 7
Dependent Claim
30 words
The process described in claim 1 or 2 or 3 or 4 wherein said converting of said by-product fraction is conducted in the presence of hydrogen gas with ZSM-5 catalyst.
Claim 8
Dependent Claim
192 words
A process for catalytically dewaxing a petroleum distillate feed boiling within the range of about 500° F. to about 1050° F., which comprises: contacting said feed and hydrogen gas under dewaxing conditions in a first reactor with a first crystalline aluminosilicate catalyst having a Constraint Index of 1 to 12 and a silica to alumina ratio of at least 12 thereby forming a dewaxed fuel oil and a by-product fraction that contains olefins, said fraction boiling up to about 415° F. and containing more than about 40 wt% of hydrocarbons boiling in the C 5 to 415° F. range; separating said by-product fraction and hydrogen from said dewaxed fuel oil; cascading said separated by-product fraction and hydrogen to a second reactor wherein it is converted with a second crystalline aluminosilicate zeolite catalyst having a Constraint Index of 1 to 12 and a silica to alumina ratio of at least 12, said conversion being conducted under a combination of reaction conditions effective to increase the aromatic hydrocarbon content of said by-product fraction by from at least 5.5 wt% to about 65 wt%; and recovering fuel oil and gasoline from said converted by-product fraction.
Claim 9
Dependent Claim
192 words
A process for catalytically dewaxing a petroleum distillate feed boiling within the range of about 500° F. to about 1050° F., which comprises: contacting said feed and hydrogen gas under dewaxing conditions in a first reactor with a first crystalline aluminosilicate catalyst having a Constraint Index of 1 to 12 and a silica to alumina ratio of at least 12 thereby forming a dewaxed fuel oil and a by-product fraction that contains olefins, said fraction boiling up to about 415° F. and containing more than about 40 wt% of hydrocarbons boiling in the C 5 to 415° F. range; separating said by-product fraction and hydrogen from said dewaxed fuel oil; cascading said separated by-product fraction and hydrogen to a second reactor wherein it is converted with a second crystalline aluminosilicate zeolite catalyst having a Constraint Index of 1 to 12 and a silica to alumina ratio of at least 12, said conversion being conducted under a combination of reaction conditions effective to increase the aromatic hydrocarbon content of said by-product fraction by from at least 5.5 wt% to about 65 wt%; and recovering fuel oil and gasoline from said converted by-product fraction.
Claim 10
Dependent Claim
25 words
The process described in claim 7 wherein said olefinic by-product fraction contains at least 25 wt% olefins and said separation is effected by flash distillation.
Claim 11
Dependent Claim
31 words
The process described in claim 7 or 8 wherein said second crystalline aluminosilicate zeolite catalyst is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-21, ZSM-23, ZSM-35, ZSM-38 and ZSM-48.
Claim 12
Dependent Claim
18 words
The process described in claim 7 or 8 wherein said first and said second zeolite catalyst are ZSM-5.
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) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |