US4443327A
Expired / Lapsed
US
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Method for reducing catalyst aging in the production of catalytically hydrodewaxed products
Assignee: Mobil Oil AS
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Filing: 1983-01-24
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Granted: 1984-04-17
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Expires: 2003-01-24
Abstract
Abstract A method for stabilizing the activity of a highly siliceous zeolite used as a catalyst in the processing of hydrocarbon feedstock comprises the addition of about 0.1 to 10 weight percent olefins to the feedstock prior to contacting with said catalyst under hydrocarbon conversion conditions. The method is particularly useful when used in catalytic dewaxing processes.
Inventors
- 👤 David S. Shihabi
- 👤 John D. Lutner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:21
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/58; C10G45/60; C10G45/64
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
65 words
A method for reducing the aging rate of a highly siliceous zeolite catalyst used in the catalytic hydrodewaxing of 399° C.+ (750° F.+) hydrocarbon feedstock, which method comprises the addition of from about 0.1 to 10 weight percent olefins to said feedstock prior to its exposure to said catalyst under hydrocarbon hydrodewaxing conditions which include a hydrogen pressure of between about 50 to 400 psig.
Claim 2
Independent Claim
65 words
A method for reducing the aging rate of a highly siliceous zeolite catalyst used in the catalytic hydrodewaxing of 399° C.+ (750° F.+) hydrocarbon feedstock, which method comprises the addition of from about 0.1 to 10 weight percent olefins to said feedstock prior to its exposure to said catalyst under hydrocarbon hydrodewaxing conditions which include a hydrogen pressure of between about 50 to 400 psig.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein olefin-containing hydrocarbon mixtures are added to said feedstocks.
Claim 4
Dependent Claim
10 words
The method of claim 2 wherein said olefins include propene.
Claim 5
Dependent Claim
10 words
The method of claim 2 wherein said olefins include 1-hexene.
Claim 6
Dependent Claim
19 words
The method of claim 1 wherein said contact of feedstock with said catalyst occurs in downflow trickle bed reactor.
Claim 7
Dependent Claim
48 words
The method of claim 5 wherein said feedstock is catalytically hydrodewaxed in a reactor system comprising a first stage for catalytically hydrodewaxing the feedstock by contacting with said highly siliceous zeolite catalyst and a second stage for hydrotreating the effluent from the first stage with a hydrotreating catalyst.
Claim 8
Dependent Claim
61 words
The method of claim 6 wherein said highly siliceous zeolite catalyst is selected from the group consisting of ZSM-5, ZSM-5/ZSM-11 intermediate, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 and ZSM-48; and said hydrotreating catalyst comprises at least one Group VIII metal or its oxides or sulfides and at least one Group VIA metal or its oxides or sulfides on a refractory base support.
Claim 9
Dependent Claim
35 words
The method of claim 7 wherein said highly siliceous zeolite catalyst is ZSM-5 and the Group VIA metal of said hydrotreating catalyst is molybdenum, and the Group VIII metal of said hydrotreating catalyst is cobalt.
Claim 10
Dependent Claim
40 words
The method of claim 6 wherein the hydrodewaxing conditions include a temperature of between about 260° C. and 427° C., a hydrogen circulation rate of between about 500 and 10,000 s.c.f.b. and a LHSV of between about 0.1 and 5.
Claim 11
Dependent Claim
50 words
The method of claim 6 wherein the hydrodewaxing conditions include a hydrogen pressure of between about 200 and 400 psig, a temperature of between about 260° C. and 427° C., a hydrogen circulation rate of between about 1500 and 3000 s.c.f.b. and a LHSV of between about 0.3 and 3.
Claim 12
Dependent Claim
13 words
The method of claim 6, wherein said hydrocarbon feedstock is a distillate feedstock.
Claim 13
Dependent Claim
13 words
The method of claim 6, wherein said hydrocarbon feedstock is a lube feedstock.
Claim 14
Dependent Claim
19 words
The method of claim 1 wherein about 0.25 to about 2 weight percent olefin is added to the feedstock.
Claim 15
Dependent Claim
21 words
The method of claim 1 wherein about 0.02 to 2 moles of olefin are added to each liter of the feedstock.
Claim 16
Dependent Claim
21 words
The method of claim 1 wherein about 0.02 to 0.4 moles of olefin are added to each liter of the feedstock.
Claim 17
Dependent Claim
12 words
The method of claim 1 wherein said catalyst has been hydrogen reactivated.
Claim 18
Dependent Claim
11 words
The method of claim 1 wherein said catalyst is fresh catalyst.
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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) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |