US5508019A
Expired / Lapsed
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 19:27
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.
References Cited (Backward Citations)
US3442795A
Cited
GB1061847A
Cited
US3836561A
Cited
US3442794A
Cited
US3506400A
Cited
US3597155A
Cited
US3691099A
Cited
JPS56125321A
Cited
US4454367A
Cited
EP0095304A1
Cited
US4576805A
Cited
EP0142313A1
Cited
US4891448A
Cited
US5004841A
Cited
US5026941A
Cited
US5057472A
Cited
US5389357A
Cited
US5310534A
Cited
US5204076A
Cited
US5200168A
Cited
EP0575041A1
Cited
US5288922A
Cited
FR2694549A1
Cited
US5284989A
Cited
US5313006A
Cited
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 |