Patent US5508019A successfully refreshed from Google Patents.
US5508019A
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US
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Dealumination of aluminosilicates
Assignee: Lyondell Chemical Technology LP
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Filing: 1994-06-30
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Granted: 1996-04-16
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Expires: 2014-06-30
Abstract
Abstract Crystalline aluminosilicates such as zeolite beta may be readily dealuminated using organic sulfonic acids such as methanesulfonic acid to provide useful catalysts or catalyst precursors. A high degree of aluminum removal with minimal loss of crystallinity is possible even when an organic template is not present in the starting aluminosilicate.
Inventors
- 👤 Robert J. Saxton
- 👤 Guy L. Crocco
- 👤 John G. Zajacek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:25
CPC Classifications
C; C01; C01B; C01B37/00; C01B37/02; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/70; B01J29/7007; C01B39/00; C01B39/02; C01B39/026; B01J2229/00; B01J2229/10; B01J2229/16; B01J2229/30; B01J2229/34; B01J2229/37; Y; Y10; Y10S; Y10S423/00; Y10S423/27
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
87 words
A method of removing framework aluminum from a zeolite beta, said method comprising contacting the zeolite beta with a water-soluble organic sulfonic acid, wherein the water-soluble organic sulfonic acid is present at a concentration of at least 2N in an aqueous medium, at a temperature of from 20° C. to 200° C. to form a dealuminated zeolite beta having a framework Si/Al ratio of at least 800 and a crystallinity of at least 90% relative to the crystallinity of the zeolite beta prior to said acid treatment.
Claim 2
Independent Claim
87 words
A method of removing framework aluminum from a zeolite beta, said method comprising contacting the zeolite beta with a water-soluble organic sulfonic acid, wherein the water-soluble organic sulfonic acid is present at a concentration of at least 2N in an aqueous medium, at a temperature of from 20° C. to 200° C. to form a dealuminated zeolite beta having a framework Si/Al ratio of at least 800 and a crystallinity of at least 90% relative to the crystallinity of the zeolite beta prior to said acid treatment.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the water-soluble organic sulfonic acid is methanesulfonic acid.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein the water-soluble organic sulfonic acid is present at a concentration of at least 5N.
Claim 5
Dependent Claim
26 words
The method of claim 1 comprising an additional step of contacting the dealuminated zeolite beta with a titanium compound to form a titanium substituted zeolite beta.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein the zeolite beta is essentially free of a structuring agent.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein the water-soluble organic sulfonic acid has a pk a of less than 1.
Claim 8
Dependent Claim
42 words
The method of claim 1 wherein the water soluble organic sulfonic acid is selected from the group consisting of benzenesulfonic acid, methanesulfonic acid, p-toluenesulfonic acid, ethanesulfonic acid, trifluoromethane sulfonic acid, propanesulfonic acid, butanesulfonic acid, xylenesulfonic acid, trichloromethane sulfonic acid, and mixtures thereof.
Claim 9
Dependent Claim
19 words
The method of claim 1 comprising an additional step of separating the dealuminated zeolite beta from the aqueous medium.
Claim 10
Dependent Claim
17 words
The method of claim 8 comprising an additional step of washing the dealuminated zeolite beta with water.
Claim 11
Dependent Claim
17 words
The method of claim 9 comprising an additional step of drying the dealuminated zeolite beta after washing.
Claim 12
Dependent Claim
12 words
The method of claim 8 wherein the separated aqueous medium is recycled.
Claim 13
Dependent Claim
15 words
The method of claim 1 wherein said temperature is from 40° C. to 120° C.
Claim 14
Dependent Claim
13 words
The method of claim 1 wherein said contacting is performed in multiple stages.
Claim 15
Dependent Claim
14 words
The method of claim 1 wherein said contacting is performed in a single stage.
Claim 16
Independent Claim
107 words
A method of removing framework aluminum from a zeolite beta, said method comprising contacting the zeolite beta with a water-soluble organic sulfonic acid having the structure RSO 3 H wherein R is C 1 -C 20 alkyl or C 6 -C 20 aryl, wherein the water soluble organic sulfonic acid is present at a concentration of at least 5N in an aqueous medium, at a temperature of 40° C. to 120° C. to form a dealuminated zeolite beta having a framework Si/Al ratio of at least 800 and a crystallinity of at least 90% relative to the crystallinity of the zeolite beta prior to said acid treatment.
Claim 17
Independent Claim
107 words
A method of removing framework aluminum from a zeolite beta, said method comprising contacting the zeolite beta with a water-soluble organic sulfonic acid having the structure RSO 3 H wherein R is C 1 -C 20 alkyl or C 6 -C 20 aryl, wherein the water soluble organic sulfonic acid is present at a concentration of at least 5N in an aqueous medium, at a temperature of 40° C. to 120° C. to form a dealuminated zeolite beta having a framework Si/Al ratio of at least 800 and a crystallinity of at least 90% relative to the crystallinity of the zeolite beta prior to said acid treatment.
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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) | 1999-04-16 | 1999-10-16 | 2000-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-16 | 2003-10-16 | 2004-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-16 | 2007-10-16 | 2008-04-16 | $7700.00 | Window Closed / Lapsed |