Patent US4908342A successfully refreshed from Google Patents.
US4908342A
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US
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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 09:57
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.
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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) | 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 |