US4007253A
Expired / Lapsed
US
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Production of synthetic zeolite of faujasite structure
Assignee: Bayer AG
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Filing: 1975-07-25
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Granted: 1977-02-08
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Expires: 1995-07-25
Abstract
Abstract A process for the production of synthetic zeolite with the crystal structure of faujasite and with a composition corresponding to the formula: Na.sub.2 O . Al.sub.2 O.sub.3 . (2.5 ± 0.5) SiO.sub.2 . n H.sub.2 O (n = 0 to 8) comprising forming a reaction mixture containing Na 2 O, Al 2 O 3 , SiO 2 and H 2 O at a temperature of about 60° to 105° C in the presence of about 1 to 20% of finely divided zeolite A based on the weight of Na 2 O + Al 2 O 3 + SiO 2 , thereby to form a precipitate which crystallizes to form a synthetic zeolite of faujasite structure. Advantageously the molar ratios of the oxides in the reaction mixture, exclusive of the added zeolite A, are approximately: SiO.sub.2 /Al.sub.2 O.sub.3 = 3 to 5 Na.sub.2 O/SiO.sub.2 = 1.2 to 1.5 H.sub.2 O/Na.sub.2 O = 35 to 45. Even if the mass is stirred during crystallization, little or no phillipsite is produced.
Inventors
- 👤 Lothar Puppe
- 👤 Gunter Ulisch
- 👤 Friedrich Schwochow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:56
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B39/28; Y; Y10; Y10S; Y10S423/00; Y10S423/21
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A process for the production of synthetic zeolite with the crystal structure of faujasite and with a composition corresponding to the formula Na.sub.2 O . Al.sub.2 O.sub.3 . (2.5 ± 0.5) SiO.sub.2 . n H.sub.2 O (n = 0 to 8) comprising forming a reaction mixture containing Na 2 O, Al 2 O 3 , SiO 2 and H 2 O at a temperature of about 60° to 105° C in the presence of about 1 to 20% of finely divided zeolite A based on the weight of Na 2 O + Al 2 O 3 + SiO 2 , the molar proportions of the oxides in the reaction mixture being sufficient to form a precipitate which can crystallize to form synthetic zeolite of faujasite structure, and permitting said precipitate to crystallize to essentially pure faujasite.
Claim 2
Dependent Claim
136 words
A process for the production of synthetic zeolite with the crystal structure of faujasite and with a composition corresponding to the formula Na.sub.2 O . Al.sub.2 O.sub.3 . (2.5 ± 0.5) SiO.sub.2 . n H.sub.2 O (n = 0 to 8) comprising forming a reaction mixture containing Na 2 O, Al 2 O 3 , SiO 2 and H 2 O at a temperature of about 60° to 105° C in the presence of about 1 to 20% of finely divided zeolite A based on the weight of Na 2 O + Al 2 O 3 + SiO 2 , the molar proportions of the oxides in the reaction mixture being sufficient to form a precipitate which can crystallize to form synthetic zeolite of faujasite structure, and permitting said precipitate to crystallize to essentially pure faujasite.
Claim 3
Dependent Claim
46 words
A process as claimed in claim 1, wherein the molar ratios of the oxides in the reaction mixture, exclusive of the added zeolite A, are about: SiO.sub.2 /Al.sub.2 O.sub.3 = 3 to 5 Na.sub.2 O/SiO.sub.2 = 1.2 to 1.5 H.sub.2 O/Na.sub.2 O = 35 to 45.
Claim 4
Dependent Claim
29 words
A process as claimed in claim 1, wherein crystallization is effected with stirring of the reaction mixture containing the precipitate over a period of about 0.5 to 10 hours.
Claim 5
Dependent Claim
31 words
A process as claimed in claim 1, wherein more than about 30% of the total number of particles of added zeolite A have a radius of less than about 1 micron.
Claim 6
Dependent Claim
93 words
A process as claimed in claim 4, wherein precipitation and crystallization are effected in the presence of about 3 to 10% by weight of added zeolite A at a temperature of about 80° to 100° C with stirring of the reaction mixture containing the precipitate over a period of about 2 to 6 hours, and the molar ratios of the oxides in the reaction mixture, exclusive of the added zeolite A, are about SiO.sub.2 /Al.sub.2 O.sub.3 = 3 to 5 Na.sub.2 O/SiO.sub.2 = 1.2 to 1.5 H.sub.2 O/Na.sub.2 O = 35 to 45.
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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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |