US5200168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the dealumination of zeolite Beta
Assignee: ExxonMobil Oil Corp
•
Filing: 1992-01-31
•
Granted: 1993-04-06
•
Expires: 2012-01-31
Abstract
Abstract A process for the dealumination of a zeolite having the structure of zeolite Beta by contacting the zeolite with dicarboxylic acid, such as oxalic acid.
Inventors
- 👤 Minas R. Apelian
- 👤 Thomas F. Degnan
- 👤 Anthony S. Fung
- 👤 Gordon J. Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:53
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/70; B01J29/7007; B01J2229/00; B01J2229/10; B01J2229/16; Y; Y10; Y10S; Y10S423/00; Y10S423/27
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
39 words
A process for the dealumination of a zeolite having the structure of zeolite Beta, which comprises contacting said zeolite having the structure of zeolite Beta with dicarboxylic acid for a sufficient time to effect greater than about 50% dealumination.
Claim 2
Dependent Claim
39 words
A process for the dealumination of a zeolite having the structure of zeolite Beta, which comprises contacting said zeolite having the structure of zeolite Beta with dicarboxylic acid for a sufficient time to effect greater than about 50% dealumination.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein greater than about 85% dealumination is effected.
Claim 4
Dependent Claim
28 words
The process of claim 1 wherein the dealuminated zeolite having the structure of zeolite Beta has a silica to alumina ratio of greater than about 400 to 1.
Claim 5
Dependent Claim
28 words
The process of claim 1 wherein the dealuminated zeolite having the structure of zeolite Beta has a silica to alumina ratio of greater than about 600 to 1.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein said contacting results in less than about 10% loss of crystallinity.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said dicarboxylic acid is in solution.
Claim 8
Dependent Claim
25 words
The process of claim 6 wherein said solution of dicarboxylic acid is at a volume ratio of solution to catalyst of at least about 1:1.
Claim 9
Dependent Claim
15 words
The process of claim 1 wherein said dicarboxylic acid is an aqueous dicarboxylic acid solution.
Claim 10
Dependent Claim
23 words
The process of claim 1 wherein said dicarboxylic acid is in a concentration in the range of from about 0.01 to about 4M.
Claim 11
Dependent Claim
29 words
The process of claim 1 wherein said dicarboxylic acid is selected from the group consisting of oxalic, malonic, succinic, glutaric, adipic, maleic, phthalic, isophthalic, terephthalic, fumaric and mixtures thereof.
Claim 12
Dependent Claim
12 words
The process of claim 1 wherein said dicarboxylic acid is oxalic acid.
Claim 13
Dependent Claim
18 words
The process of claim 1 wherein said contacting is for a time of at least about 10 minutes.
Claim 14
Dependent Claim
24 words
The process of claim 1 wherein said contacting is at a temperature in the range of from about 60° F. to about 200° F.
Claim 15
Dependent Claim
23 words
The process of claim 1 wherein said zeolite having the structure of zeolite Beta is incorporated with a binder prior to said dealumination.
Claim 16
Dependent Claim
10 words
The process of claim 14 wherein said binder is silica.
Claim 17
Dependent Claim
39 words
A process for the dealumination of a zeolite having the structure of zeolite Beta, which comprises contacting said zeolite having the structure of zeolite Beta with oxalic acid for a sufficient time to effect greater than about 50% dealumination.
Claim 18
Dependent Claim
39 words
A process for the dealumination of a zeolite having the structure of zeolite Beta, which comprises contacting said zeolite having the structure of zeolite Beta with oxalic acid for a sufficient time to effect greater than about 50% dealumination.
Claim 19
Dependent Claim
30 words
The zeolite having the structure of zeolite Beta produced by the process of claim 1, wherein said zeolite has a slicia to alumina ratio greater than about 600 to 1.
Claim 20
Dependent Claim
30 words
The zeolite having the structure of zeolite Beta produced by the process of claim 16, wherein said zeolite has a silica to alumina ratio greater than about 600 to 1.
References Cited (Backward Citations)
US3442795A
Cited
US3308069A
Cited
USRE28341E
Cited
US4388177A
Cited
US4419220A
Cited
US4701313A
Cited
EP0259526A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-05 | 1996-10-05 | 1997-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-05 | 2000-10-05 | 2001-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-05 | 2004-10-05 | 2005-04-06 | $7700.00 | Window Closed / Lapsed |