Patent JPS6025834A successfully refreshed from Google Patents.
US4375458A
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US
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Synthesis of large crystallite zeolites
Assignee: Mobil Oil AS
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Filing: 1981-09-23
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Granted: 1983-03-01
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Expires: 2001-09-23
Abstract
Abstract The invention provides a method of making large crystallite zeolites by a method comprising forming the zeolite in a medium containing a combination of two different alkylammonium cations or a combination of an alkylammonium cation and a metallic cation. In the combination at least one of the cations will have an ionic radius of from about 1.40 to the pore size of the specific zeolite.
Inventors
- 👤 Francis G. Dwyer
- 👤 Pochen Chu
- 👤 William E. Cormier, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:23
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2876; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/65; B01J29/70; Y; Y10; Y10S; Y10S423/00; Y10S423/22; Y10S423/23; Y10S423/29; Y10S423/33
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
In a method of preparing a crystalline aluminosilicate zeolite having a SiO 2 to Al 2 O 3 molar ratio of from about 25 to about 1000 and a Constraint Index of from 1 to 12 from an aqueous reaction mixture comprising sources of silica, alumina and alkylammonium cations and metal cations, the improvement which comprises having in the reaction medium for which said zeolite is prepared, metal cations having an ionic radius of from 1.40 A to the pore size of the specific zeolite whereby the crystal size of the zeolite product in increased to at least 1 micron.
Claim 2
Dependent Claim
100 words
In a method of preparing a crystalline aluminosilicate zeolite having a SiO 2 to Al 2 O 3 molar ratio of from about 25 to about 1000 and a Constraint Index of from 1 to 12 from an aqueous reaction mixture comprising sources of silica, alumina and alkylammonium cations and metal cations, the improvement which comprises having in the reaction medium for which said zeolite is prepared, metal cations having an ionic radius of from 1.40 A to the pore size of the specific zeolite whereby the crystal size of the zeolite product in increased to at least 1 micron.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the alkylammonium cations comprise tetramethylammonium, tetraethylammonium or tetrapropylammonium cations.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein the alkylammonium cations comprise tetramethylammonium cations.
Claim 5
Dependent Claim
12 words
The method of claim 2 wherein the alkylammonium cations comprise tetraethylammonium cations.
Claim 6
Dependent Claim
12 words
The method of claim 2 wherein the alkylammonium cations comprise tetrapropylammonium cations.
Claim 7
Dependent Claim
14 words
The method of claim 1 wherein the metal cations comprise cesium or rubidium cations.
Claim 8
Independent Claim
15 words
The method of claims 3, 4 or 5 wherein the metal cations comprise cesium cations.
Claim 9
Independent Claim
15 words
The method of claims 3, 4 or 5 wherein the metal cations comprise rubidium cations.
Claim 10
Dependent Claim
21 words
The method of claim 1 wherein said zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-35 and ZSM-38.
Claim 11
Dependent Claim
10 words
The method of claim 9 wherein said zeolite is ZSM-5.
References Cited (Backward Citations)
US3702886A
Cited
US3849463A
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GB1345363A
Cited
US3832449A
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US3904738A
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US3941871A
Cited
US4025571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-28 | 1986-08-30 | 1987-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-28 | 1990-08-30 | 1991-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-28 | 1994-08-30 | 1995-03-01 | $7700.00 | Window Closed / Lapsed |