US4908342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
ZSM-5 zeolites having uniformly large crystals
Assignee: Mobil Oil AS
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Filing: 1987-03-03
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Granted: 1990-03-13
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Expires: 2007-03-03
Abstract
Abstract There is provided an improvement for making large crystallite ZSM-5 zeolites by a method comprising forming the zeolite in a medium containing a combination of tetramethylammonium and tetrapropylammonium cations. The improvement involves the addition of sodium chloride to the aqueous reaction medium to increase the uniformity of crystallite size and to increase the mean crystallite size. Also provided are catalysts comprising these ZSM-5 crystallites and processes for converting organic compounds with these catalysts.
Inventors
- 👤 John P. McWilliams
- 👤 Catherine T. Sigal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:55
CPC Classifications
C; C07; C07C; C07C6/00; C07C6/08; C07C6/12; C07C6/123; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; C01; C01B; C01B39/00; C01B39/02; C01B39/36; C01B39/38; C01B39/40; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2/86; C07C2/862; C07C2/864; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/36; B01J2229/42; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
43 words
A catalyst composition comprising an extrudate of zeolite crystallites and a binder, said crystallites being ZSM-5 crystallites having an average minimum dimension of greater than 3 microns with a size variation of no more than 25 percent in terms of relative standard deviation.
Claim 2
Dependent Claim
43 words
A catalyst composition comprising an extrudate of zeolite crystallites and a binder, said crystallites being ZSM-5 crystallites having an average minimum dimension of greater than 3 microns with a size variation of no more than 25 percent in terms of relative standard deviation.
Claim 3
Dependent Claim
12 words
A catalyst composition according to claim 1, wherein said binder is clay.
Claim 4
Dependent Claim
30 words
A catalyst composition according to claim 1, wherein said binder is selected from the group consisting of alumina, silica, silica-alumina, silica-magnesia, silica-zirconia, silica-thoria, silica-beryllia, silica-titania, silica-alumina-thoria, silica-alumina-zirconia, silica-alumina-magnesia and silica-magnesia-zirconia.
Claim 5
Dependent Claim
27 words
A catalyst composition according to claim 1, wherein said ZSM-5 crystallites comprise from about 1 to about 99 percent by weight of the total crystallites plus binder.
Claim 6
Dependent Claim
27 words
A catalyst composition according to claim 1, wherein said ZSM-5 crystallites comprise from about 5 to about 80 percent by weight of the total crystallites plus binder.
Claim 7
Dependent Claim
12 words
A catalyst composition according to claim 5, wherein said binder is alumina.
Claim 8
Dependent Claim
18 words
A catalyst composition according to claim 6, wherein said crystallites have an average crystallite size of 16×8×4 microns.
References Cited (Backward Citations)
GB1003266A
Cited
US3790471A
Cited
US3849463A
Cited
US3941871A
Cited
US3976598A
Cited
US4100215A
Cited
GB1581513A
Cited
GB1601915A
Cited
US4375458A
Cited
US4182923A
Cited
AU536830B2
Cited
AU536561B2
Cited
AU537988B2
Cited
JPS577817A
Cited
EP0057016A2
Cited
EP0065400A2
Cited
EP0065401A2
Cited
DE3212106A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |