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US3789107A
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Process for producing a crystalline zeolite
Assignee: WR Grace and Co Conn
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Filing: 1971-05-04
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Granted: 1974-01-29
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Expires: 1991-05-04
Abstract
Abstract Faujasitic-type crystalline zeolites X and Y are produced. In one embodiment, sodium sulfide is added to the reaction mixture as a source of sodium and as a buffer. The buffering action of the sodium sulfide provides the basicity required to maintain the alumina hydrate component of the reaction mixture in solution but not a basicity whereby zeolite crystallization is retarded. In another embodiment, a nucleating mixture having the formula 310Na2S: 5-15 Na2O: 5-50 SiO2: 0.4-4.0 Al2O3: 50-500H20 is added to the reaction mixture to promote crystall;ne zeolite formation.
Inventors
- 👤 C Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:58
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2838; Y; Y10; Y10S; Y10S423/00; Y10S423/21
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
19 words
A method as in claim 1 wherein said zeolite nuleating mixture has the composition 5.0 Na2S:10.7 Na2O:14.9 SiO2:Al2O3:319 H2O.
Claim 2
Dependent Claim
15 words
A method as in claim 1 wherein said crystalline zeolite is washed, dried and activated.
Claim 3
Dependent Claim
31 words
A method as in claim 1 wherein said nucleating mixture is added so as to be in a concentration of about 2 to 10 percent by weight of the reaction mixture.
Claim 4
Dependent Claim
28 words
A method as in claim 1 wherein prior to step (c), the mixture of step (b) is aged at 15* to 75* C for 0.5 to 4 hours.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |