US5310534A
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Process for dealuminization of the synthetic zeolites of large pores, catalysts and selective organophilic adsorbents containing the dealuminized zeolites obtained according to the process and essentially silicic beta zeolite
Assignee: Societe National Elf Aquitaine
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Filing: 1991-11-26
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Granted: 1994-05-10
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Expires: 2011-11-26
Abstract
Abstract A process is provided for dealuminization of zeolites having large pores, the diameter of the aperture of the pores being greater than or equal to about 0.7 nm and the silica/alumina ratio greater than or equal to about 6. The process comprises acid leaching of the raw zeolite containing the structuring agent. The dealuminized zeolites obtained are useful as catalysts for the transformation of hydrocarbons and as selective organophilic adsorbents.
Inventors
- 👤 Francois Fajula
- 👤 Elodie Bourgeat-Lami
- 👤 Catherine Zivkov
- 👤 Thierry Des Courieres
- 👤 Didier Anglerot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:53
CPC Classifications
C; C01; C01B; C01B37/00; C01B37/02; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/70; B01J29/7007; C01B39/00; C01B39/02; C01B39/026; B01J2229/00; B01J2229/10; B01J2229/16; Y; Y10; Y10S; Y10S423/00; Y10S423/27
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
52 words
A process for dealuminization of a synthetic zeolite having pores with the diameter of aperture of the channels of greater than or equal to about 0.7 nm and a silica/alumina ratio greater than or equal to about 6, which comprises subjecting said raw zeolite while containing the structuring agent, to acid leaching.
Claim 2
Dependent Claim
52 words
A process for dealuminization of a synthetic zeolite having pores with the diameter of aperture of the channels of greater than or equal to about 0.7 nm and a silica/alumina ratio greater than or equal to about 6, which comprises subjecting said raw zeolite while containing the structuring agent, to acid leaching.
Claim 3
Dependent Claim
59 words
The process according to claim 1, wherein the raw zeolite of synthesis corresponds to the formula: ##EQU3## wherein M is a metal cation of valence n, S is the structuring agent ##EQU4## y has a value of from 0.5 to 8 z has a value of from 6 to 200 w has a value of from 4 to 50.
Claim 4
Dependent Claim
21 words
The process according to claim 1, wherein the synthetic zeolite is selected from the group consisting of beta zeolite and ZSM-20.
Claim 5
Dependent Claim
13 words
The process according to claim 1, wherein the synthetic zeolite is beta zeolite.
Claim 6
Dependent Claim
21 words
The process according to claim 1, wherein the raw zeolite is separated from its mother liquors prior to the acid leaching.
Claim 7
Dependent Claim
22 words
The process according to claim 1, wherein the raw zeolite is not separated from its mother liquors prior to the acid leaching.
Claim 8
Dependent Claim
27 words
The process according to claim 1, wherein the acid is a strong organic acid selected from the group consisting of formic acid, trichloroacetic acid, and trifluoroacetic acid.
Claim 9
Dependent Claim
27 words
The process according to claim 1, wherein the acid is a strong inorganic acid selected from the group consisting of hydrochloric acid, sulfuric acid and nitric acid
Claim 10
Dependent Claim
14 words
The process according to claim 8 wherein the strong inorganic acid is nitric acid.
Claim 11
Dependent Claim
15 words
The process according to claim 1, wherein the concentration of the acid is above 2N.
Claim 12
Dependent Claim
18 words
The process according to claim 10, wherein the concentration of the acid is between about 2 and 15N.
Claim 13
Dependent Claim
19 words
The process according to claim 10, wherein the concentration of the acid is between about 5 and about 15N.
Claim 14
Dependent Claim
23 words
The process according to claim 1, wherein from about 5 to about 150 ml of acid solution per gram of zeolite are used.
Claim 15
Dependent Claim
17 words
The process according to claim 1, wherein the dealuminization temperature is between about 20° and 100° C.
Claim 16
Dependent Claim
18 words
The process according to claim 1, wherein the dealuminization temperature is between about 70° and about 90° C.
Claim 17
Dependent Claim
19 words
The process according to claim 1, wherein the duration of dealuminization is between about 1 and about 40 hours.
Claim 18
Dependent Claim
19 words
The process according to claim 1, wherein the duration of dealuminization is between about 3 and about 30 hours.
Claim 19
Dependent Claim
20 words
A catalyst for the transformation of hydrocarbons comprised of a zeolite dealuminized according to the process described in claim 1.
Claim 20
Dependent Claim
17 words
A selective organophilic adsorbent comprised of a zeolite dealuminized according to the process described in claim 1.
Claim 21
Dependent Claim
28 words
An essentially silicic beta zeolite, having a silica/alumina ratio of greater than or equal to about 800 and a crystallinity of greater than or equal to about 80%.
Claim 22
Dependent Claim
28 words
An essentially silicic beta zeolite, having a silica/alumina ratio of greater than or equal to about 800 and a crystallinity of greater than or equal to about 80%.
Claim 23
Dependent Claim
29 words
A zeolite according to claim 20, having a silica/alumina ratio of greater than or equal to about 4000 and a crystallinity of greater than or equal to about 80%.
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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) | 1997-05-09 | 1997-11-08 | 1998-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-09 | 2001-11-08 | 2002-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-09 | 2005-11-08 | 2006-05-10 | $7700.00 | Window Closed / Lapsed |