US5080878A
Expired / Lapsed
US
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Modified crystalline aluminosilicate zeolite catalyst and its use in the production of lubes of high viscosity index
Assignee: ExxonMobil Oil Corp
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Filing: 1990-05-14
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Granted: 1992-01-14
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Expires: 2010-05-14
Abstract
Abstract The catalytic activity of a crystalline aluminosilicate zeolite having a Constraint Index of from about 1 to about 12 for a variety of hydrocarbon conversions including the oligomerization of olefins to provide high viscosity index lubes is significantly enhanced by modifying the catalyst to reduce surface acid sites. This is accomplished by contacting the zeolite with a fluorosilicate salt to extract surface zeolite aluminum which is replaced by silicon.
Inventors
- 👤 Emmerson Bowes
- 👤 David S. Shihabi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:08
CPC Classifications
C; C10; C10G; C10G50/00; C10G50/02; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J2229/00; B01J2229/10; B01J2229/16; B01J2229/30; B01J2229/36; B01J2229/37; B01J29/65; B01J29/70; Y; Y10; Y10S; Y10S423/00; Y10S423/22; Y10S423/23; Y10S423/29; Y10S423/33; Y10S423/35; Y10S423/36
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
63 words
A method for reducing the surface acidity of a crystalline aluminosilicate having a silica to alumina mole ratio of 100 or less, said crystalline aluminosilicate being selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-22, ZSM-23, ZSM-35, ZSM-38 and ZSM-48, said method comprising contacting the zeolite with aqueous fluorosilicate salt to extract external zeolite aluminum therefrom, said aluminum being replaced with silicon.
Claim 2
Independent Claim
63 words
A method for reducing the surface acidity of a crystalline aluminosilicate having a silica to alumina mole ratio of 100 or less, said crystalline aluminosilicate being selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-22, ZSM-23, ZSM-35, ZSM-38 and ZSM-48, said method comprising contacting the zeolite with aqueous fluorosilicate salt to extract external zeolite aluminum therefrom, said aluminum being replaced with silicon.
Claim 3
Dependent Claim
13 words
The method of claim 1, wherein the zeolite is in the ammonium form.
Claim 4
Dependent Claim
17 words
The method of claim 2, wherein the thus-contacted zeolite is further treated to provide the hydrogen form.
Claim 5
Dependent Claim
11 words
The method of claim 1, wherein the starting zeolite is ZSM-5.
Claim 6
Dependent Claim
32 words
The method of claim 1, wherein the fluorosilicate salt is represented by the formula: (A).sub.2/b SiF.sub.6 wherein A is a metallic or non-metallic cation other than H + having the valence b.
Claim 7
Dependent Claim
67 words
The method of claim 5, wherein A is alkylammonium, NH 4 + , Mg ++ , Li + , Na + , K + , Ba ++ , Cd ++ , Cu + , Ca ++ , Cs + , Fe ++ , Co ++ , Pb ++ , Mn ++ , Rb + , Ag + , Sr ++ , Tl + and Zn ++ .
Claim 8
Dependent Claim
17 words
The method of claim 5, wherein the fluorosilicate salt is (NH 4 ) 3 SiF 6 .
Claim 9
Dependent Claim
19 words
The method of claim 1, wherein said zeolite has a silica to alumina mole ratio of 20 or more.
Claim 10
Dependent Claim
18 words
The method of claim 1, wherein said contacting takes place in the absence of an aluminum-containing binder material.
Claim 11
Dependent Claim
10 words
The method of claim 1, wherein said zeolite is binder-free.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-01-13 | 1995-07-15 | 1996-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-13 | 1999-07-15 | 2000-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-13 | 2003-07-15 | 2004-01-14 | $7700.00 | Window Closed / Lapsed |