US4650656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large crystal ZSM-5 from template addition to the gel
Assignee: Mobil Oil AS
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Filing: 1985-04-19
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Granted: 1987-03-17
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Expires: 2005-04-19
Abstract
Abstract Large crystal aluminosilicate zeolites of the ZSM-5 type, as crystallized having at least one crystalline dimension in excess of about 1 micron are prepared by introducing an alkyl ammonium compound or its precursor into the crystallization mixture under high agitation and controlled conditions of concentration and temperature.
Inventors
- 👤 Francis G. Dwyer
- 👤 Donald J. Klocke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:58
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2876; Y; Y10; Y10S; Y10S423/00; Y10S423/22
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
113 words
A process for preparing ZSM- 5 characterized by having at least one crystalline dimension of about 1 micron or more which comprises preparing an aluminosilicate gel, and thereafter adding a mixture of alkyl ammonium compound precursors to said gel and raising the temperature of the resultant gel-mixture to at least about 300° F., a level sufficient to promote crystallization thereof, under agitation, thereby dispersing said precursors uniformly throughout the mixture and inhibiting the formation of the alkyl ammonium compound whereby the concentration of said alkyl ammonium compound is maintained therein at low effective concentrations throughout the crystallization such that the nitrogen content of the mother liquor is less than about 0.003 weight percent.
Claim 2
Dependent Claim
113 words
A process for preparing ZSM- 5 characterized by having at least one crystalline dimension of about 1 micron or more which comprises preparing an aluminosilicate gel, and thereafter adding a mixture of alkyl ammonium compound precursors to said gel and raising the temperature of the resultant gel-mixture to at least about 300° F., a level sufficient to promote crystallization thereof, under agitation, thereby dispersing said precursors uniformly throughout the mixture and inhibiting the formation of the alkyl ammonium compound whereby the concentration of said alkyl ammonium compound is maintained therein at low effective concentrations throughout the crystallization such that the nitrogen content of the mother liquor is less than about 0.003 weight percent.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the alkyl ammonium compound precursors consist of C 1 -C 10 alkyl ammonium compound precursors.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein said alkyl ammonium compound is a tetraalkyl halogenated ammonium compound.
Claim 5
Dependent Claim
13 words
The process of claim 3 wherein said alkyl ammonium compound is tetrapropylammonium bromide.
Claim 6
Dependent Claim
17 words
The process of claim 4 wherein the precursor materials of tetrapropylammonium bromide are tri-n-propylamine and n-propyl bromide.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein said zeolite has at least one crystalline dimension greater than about 2 microns.
Claim 8
Dependent Claim
22 words
The process of claim 6 wherein said crystalline dimension is the large dimension of said zeolite, and is from about 3-5 microns.
Claim 9
Dependent Claim
21 words
The process of claim 1 wherein said nitrogen content of the mother liquor ranges between about 0.001 to 0.003 weight percent.
Claim 10
Dependent Claim
12 words
The process of claim 1 wherein said temperature is about 300° F.
Claim 11
Dependent Claim
110 words
A process for preparing ZSM-5 characterized by having at least one crystalline dimension of about 1 micron or more which comprises preparing an aluminosilicate gel and thereafter adding a mixture of alkyl ammonium compound precursors to said gel and raising the temperature of the resultant gel-mixture to about 320±100° F., a level sufficient to promote crystallization thereof, under agitation thereby dispersing said precursors uniformly throughout the mixture and inhibiting the formation of the alkyl ammonium compound whereby the concentration of said alkyl ammonium compound is maintained therein at low effective concentrations throughout the crystallization such that the nitrogen content of the mother liquor is less than about 0.003 weight percent.
Claim 12
Dependent Claim
110 words
A process for preparing ZSM-5 characterized by having at least one crystalline dimension of about 1 micron or more which comprises preparing an aluminosilicate gel and thereafter adding a mixture of alkyl ammonium compound precursors to said gel and raising the temperature of the resultant gel-mixture to about 320±100° F., a level sufficient to promote crystallization thereof, under agitation thereby dispersing said precursors uniformly throughout the mixture and inhibiting the formation of the alkyl ammonium compound whereby the concentration of said alkyl ammonium compound is maintained therein at low effective concentrations throughout the crystallization such that the nitrogen content of the mother liquor is less than about 0.003 weight percent.
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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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |