US4247388A
Expired / Lapsed
US
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Hydrodewaxing catalyst performance
Assignee: Mobil Oil AS
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Filing: 1979-06-27
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Granted: 1981-01-27
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Expires: 1999-06-27
Abstract
Abstract A method is disclosed for the improvement of catalyst performance in catalytic hydrodewaxing of both petroleum and synthetic hydrocarbon feedstocks utilizing a special group of acidic crystalline aluminosilicate zeolites such as those of the ZSM-5 type which involves treatment of said zeolites in order to adjust their initially high alpha activity to within a range of 55-150 alpha prior to use as catalysts in a hydrodewaxing operation.
Inventors
- 👤 Frederick Banta
- 👤 Henry R. Ireland
- 👤 Thomas R. Stein
- 👤 Robert C. Wilson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:49
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/58; C10G45/60; C10G45/64; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/42; B01J29/46
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
94 words
In the process of hydrodewaxing a petroleum or synthetic hydrocarbon charge by contact of said charge and hydrogen at elevated temperatures and pressures with an acidic crystalline aluminosilicate zeolite having a pore diameter greater than about 5 Angstroms, a silica-to-alumina ratio of at least 12, and a constraint index within the range of 1-12 at elevated temperatures, the improvement which comprises treating said zeolite prior to use so as to adjust its alpha activity from a value in excess of 150 to within the range of 55-150 in order to enhance its catalytic properties.
Claim 2
Dependent Claim
94 words
In the process of hydrodewaxing a petroleum or synthetic hydrocarbon charge by contact of said charge and hydrogen at elevated temperatures and pressures with an acidic crystalline aluminosilicate zeolite having a pore diameter greater than about 5 Angstroms, a silica-to-alumina ratio of at least 12, and a constraint index within the range of 1-12 at elevated temperatures, the improvement which comprises treating said zeolite prior to use so as to adjust its alpha activity from a value in excess of 150 to within the range of 55-150 in order to enhance its catalytic properties.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said acidic zeolite has a hydrogenation/dehydrogenation component associated therewith.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein said hydrogenation/dehydrogenation component is nickel.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the initial alpha activity of said zeolite is reduced to an alpha value of 65-135.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein the initial alpha activity of said zeolite is reduced to an alpha value of 90-120.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein a ZSM-5 type zeolite is used.
Claim 8
Dependent Claim
12 words
The process of claim 2 wherein a ZSM-5 type zeolite is used.
Claim 9
Dependent Claim
12 words
The process of claim 3 wherein a ZSM-5 type zeolite is used.
Claim 10
Dependent Claim
12 words
The process of claim 4 wherein a ZSM-5 type zeolite is used.
Claim 11
Dependent Claim
12 words
The process of claim 5 wherein a ZSM-5 type zeolite is used.
Claim 12
Dependent Claim
10 words
The process of claim 6 wherein the zeolite is ZSM-5.
Claim 13
Dependent Claim
10 words
The process of claim 7 wherein the zeolite is ZSM-5.
Claim 14
Dependent Claim
10 words
The process of claim 9 wherein the zeolite is ZSM-5.
Claim 15
Dependent Claim
10 words
The process of claim 10 wherein the zeolite is ZSM-5.
Claim 16
Dependent Claim
10 words
The process of claim 6 wherein the zeolite is ZSM-11.
Claim 17
Dependent Claim
10 words
The process of claim 7 wherein the zeolite is ZSM-11.
Claim 18
Dependent Claim
10 words
The process of claim 9 wherein the zeolite is ZSM-11.
Claim 19
Dependent Claim
10 words
The process of claim 10 wherein the zeolite is ZSM-11.
Claim 20
Dependent Claim
20 words
The process of claim 1 wherein the reduction of alpha activity is accomplished by steaming said zeolite prior to use.
Claim 21
Dependent Claim
24 words
The process of claim 1 wherein the reduction of alpha activity is accomplished by control of the silica to alumina ratio of said zeolite.
Claim 22
Dependent Claim
20 words
The process of claim 1 wherein the reduction of alpha activity is accomplished by base exchange with alkali metal cations.
Claim 23
Dependent Claim
63 words
In the process of hydrodewaxing a petroleum or synthetic hydrocarbon charge by contact of said charge and hydrogen at elevated temperatures and pressures with acid crystalline aluminosilicate zeolite ZSM-5 wherein said zeolite is contacted with steam prior to use in order to enhance the catalytic properties, the improvement which comprises carrying out said steaming until said zeolite has an alpha value of 55-150.
Claim 24
Dependent Claim
63 words
In the process of hydrodewaxing a petroleum or synthetic hydrocarbon charge by contact of said charge and hydrogen at elevated temperatures and pressures with acid crystalline aluminosilicate zeolite ZSM-5 wherein said zeolite is contacted with steam prior to use in order to enhance the catalytic properties, the improvement which comprises carrying out said steaming until said zeolite has an alpha value of 55-150.
Claim 25
Dependent Claim
15 words
The process of claim 22 wherein said acid ZSM-5 has a hydrogenation/dehydrogenation component associated therewith.
Claim 26
Dependent Claim
11 words
The process of claim 23 wherein said hydrogenation/dehydrogenation component is nickel.
Claim 27
Dependent Claim
19 words
The process of claim 22 wherein steaming is carried out until said zeolite has an alpha value of 80-135.
Claim 28
Dependent Claim
19 words
The process of claim 22 wherein steaming is carried out until said zeolite has an alpha value of 90-120.
References Cited (Backward Citations)
US3508867A
Cited
US3700585A
Cited
US3702886A
Cited
US3804746A
Cited
US3755145A
Cited
US3899544A
Cited
US3890218A
Cited
US3956102A
Cited
US4053532A
Cited
US4098678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |