US4753910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dealumination of aluminosilicate zeolites
Assignee: Mobil Oil AS
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Filing: 1987-02-17
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Granted: 1988-06-28
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Expires: 2007-02-17
Abstract
Abstract In a method of removing tetrahedral aluminum from a aluminosilicate zeolite, the zeolite is treated with an aqueous fluorosilicate solution which reacts with tetrahedral aluminum in said zeolite to produce water-insoluble aluminum fluoride. In addition, during or after the aluminum removal, the zeolite is contacted with an aqueous solution containing a water-soluble fluoride of reacting with the insoluble aluminum fluoride to produce a water-soluble species.
Inventors
- 👤 Scott Han
- 👤 David S. Shihabi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:13
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J2229/00; B01J2229/10; B01J2229/16; Y; Y10; Y10S; Y10S423/00; Y10S423/21; Y10S423/22
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
A method of removing tetrahedral aluminum from an aluminosilicate zeolite containing at least 50 ppm of tetrahedral aluminum, comprising the steps of: (a) contacting the zeolite with an aqueous solution containing a fluorocompound of an element different from aluminum capable of reacting with tetrahedral aluminum in said zeolite to remove said tetrahedral aluminum from the zeolite lattice and produce a water-insoluble aluminum fluoride; and (b) contacting the zeolite with an aqueous solution containing a water-soluble fluoride MF n where M has a valence of n and is selected from the group consisting of hydrogen, ammonium and a metal of Group I or Group II of the Periodic Table capable of reacting with insoluble aluminum fluoride to produce a water-soluble species.
Claim 2
Independent Claim
120 words
A method of removing tetrahedral aluminum from an aluminosilicate zeolite containing at least 50 ppm of tetrahedral aluminum, comprising the steps of: (a) contacting the zeolite with an aqueous solution containing a fluorocompound of an element different from aluminum capable of reacting with tetrahedral aluminum in said zeolite to remove said tetrahedral aluminum from the zeolite lattice and produce a water-insoluble aluminum fluoride; and (b) contacting the zeolite with an aqueous solution containing a water-soluble fluoride MF n where M has a valence of n and is selected from the group consisting of hydrogen, ammonium and a metal of Group I or Group II of the Periodic Table capable of reacting with insoluble aluminum fluoride to produce a water-soluble species.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein the zeolite is zeolite Y.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the zeolite is zeolite beta.
Claim 5
Dependent Claim
10 words
The method of claim 1 wherein the zeolite is ZSM-5.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein said fluorocompound is selected from the group consisting of a fluorosilicate and a fluorotitanate.
Claim 7
Dependent Claim
11 words
The method of claim 5 wherein the fluorocompound is ammonium fluorosilicate.
Claim 8
Dependent Claim
24 words
The method of claim 1 wherein said aqueous solution contains at least 0.0075 moles of the fluorocompound per 100 g of the anhydrous zeolite.
Claim 9
Dependent Claim
13 words
The method of claim 1 wherein said fluoride MF n is ammonium fluoride.
Claim 10
Dependent Claim
27 words
The method of claim 1 wherein steps (a) and (b) are conducted substantially simultaneously using an aqueous solution containing said fluorocompound as said fluoride MF n .
Claim 11
Dependent Claim
18 words
The method of claim 9 wherein steps (a) and (b) are conducted at 20°-125° C. for 0.2-300 hours.
Claim 12
Dependent Claim
17 words
The method of claim 9 wherein said aqueous solution is 0.001-3N in said fluoride MF n .
Claim 13
Dependent Claim
14 words
The method of claim 1 wherein step (a) is conducted prior to step (b).
Claim 14
Dependent Claim
19 words
The method of claim 12 wherein said aqueous solution is 0.001N to 5N in said fluoride MF n .
Claim 15
Dependent Claim
20 words
The method of claim 12 wherein step (b) is conducted at 20° to 100° C. for 0.005 to 20 hours.
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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) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |