US5043307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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: 1989-09-05
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Granted: 1991-08-27
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Expires: 2009-09-05
Abstract
Abstract The present invention provides a process for modifying a crystalline aluminosilicate zeolite having a Constraint Index of from about to about 12 which comprises: a) steaming the as synthesized crystalline aluminosilicate zeolite containing organic template material to decompose at least a portion of said template material and to extract zeolitic aluminum; and, b) contacting the zeolite resulting from step (a) in the ammonium, alkali metal or hydrogen form with a dealuminizing agent which forms a water-soluble complex with aluminum to remove a further quantity of zeolitic aluminum therefrom.
Inventors
- 👤 Emmerson Bowes
- 👤 Clarence D. Chang
- 👤 Scott Han
- 👤 David S. Shihabi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:06
CPC Classifications
C; C10; C10G; C10G50/00; C10G50/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
A process for modifying a crystalline aluminosilicate zeolite having a Constraint Index of from about 1 to about 12 which comprises: a) steaming the as synthesized crystalline aluminosilicate zeolite containing organic template material to decompose at least a portion of said template material and to extract zeolitic aluminum; and, b) contacting the zeolite resulting from step (a) in the ammonium, alkali metal or hydrogen form with a dealuminizing agent which forms a water-soluble complex with aluminum to remove a further quantity of zeolitic aluminum therefrom.
Claim 2
Dependent Claim
85 words
A process for modifying a crystalline aluminosilicate zeolite having a Constraint Index of from about 1 to about 12 which comprises: a) steaming the as synthesized crystalline aluminosilicate zeolite containing organic template material to decompose at least a portion of said template material and to extract zeolitic aluminum; and, b) contacting the zeolite resulting from step (a) in the ammonium, alkali metal or hydrogen form with a dealuminizing agent which forms a water-soluble complex with aluminum to remove a further quantity of zeolitic aluminum therefrom.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the modified zeolite resulting from step (b) is calcined to provide the hydrogen form of the zeolite.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein the starting zeolite is ZSM-5.
Claim 5
Dependent Claim
58 words
The process of claim 1 wherein in step (b), the steamed zeolite in the ammonium, alkali metal or hydrogen form is slurried with an aqueous solution of an ammonium or alkali metal salt which upon acidification yields an anion which complexes with aluminum, a water-soluble acid thereafter being added to said aqueous slurry to provide the dealuminizing agent.
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein said acid is a mineral acid.
Claim 7
Dependent Claim
12 words
The process of claim 5 wherein said mineral acid is hydrochloric acid.
Claim 8
Dependent Claim
15 words
The process of claim 4 wherein said salt is an ammonium or alkali metal ethylenediaminetetraacetate.
Claim 9
Dependent Claim
12 words
The process of claim 4 wherein said salt is disodium dihydrogen ethylenediaminetetraacetate.
Claim 10
Dependent Claim
12 words
The process of claim 4 wherein said salt is diammonium dihydrogen ethylenediaminetetraacetate.
Claim 11
Dependent Claim
18 words
The process of claim 1 wherein the starting zeolite has a silica/alumina mole ratio of at least 12.
Claim 12
Dependent Claim
18 words
The process of claim 1 wherein the starting zeolite has a silica/alumina mole ratio of 70 or above.
References Cited (Backward Citations)
US4093560A
Cited
US4335020A
Cited
US4443554A
Cited
US4642407A
Cited
US4487843A
Cited
US4864074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |