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US3949059A
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Process for producing faujasitic-type crystalline zeolites
Assignee: WR Grace and Co
•
Filing: 1973-10-10
•
Granted: 1976-04-06
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Expires: 1993-10-10
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 3-10 Na2S: 5-15 Na2O: 5-50 SiO2: 0.4-4.0 Al2O3: 50-500 H2O is added to the reaction mixture to promote crystalline zeolite formation.
Inventors
- 👤 Curtis H. Elliott, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:44
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: 6
Claim 1
Independent Claim
75 words
A method for producing faujasite zeolite compositions comprising: a. forming a reactant admixture having essentially the molecular formulation SiO.sub.2 /Al.sub.2 O.sub.3
2.4-20
Na.sub.2 O/Al.sub.2 O.sub.3
2-10
Na.sub.2 O/Na.sub.2 S
1-5
H.sub.2 O/Na.sub.2 O
greater than 15 b. aging said formulation at about 15° to 75°C for from 2 to 30 hours, c. heating said aged formulation at from 40° to 100°C for from 1 to 20 hours to effect crystallization, and d. recovering faujasite zeolite.
Claim 2
Independent Claim
75 words
A method for producing faujasite zeolite compositions comprising: a. forming a reactant admixture having essentially the molecular formulation SiO.sub.2 /Al.sub.2 O.sub.3
2.4-20
Na.sub.2 O/Al.sub.2 O.sub.3
2-10
Na.sub.2 O/Na.sub.2 S
1-5
H.sub.2 O/Na.sub.2 O
greater than 15 b. aging said formulation at about 15° to 75°C for from 2 to 30 hours, c. heating said aged formulation at from 40° to 100°C for from 1 to 20 hours to effect crystallization, and d. recovering faujasite zeolite.
Claim 3
Dependent Claim
38 words
A method as in claim 1 wherein a zeolite nucleating mixture consisting essentially of 3-10 Na.sub.2 S:5-15 Na.sub.2 0:5-50 SiO.sub.2 :0.1-4.0 Al.sub.2 O.sub.3 :50-500 H.sub.2 O is dispersed within said reactant admixture and said aging step is deleted.
Claim 4
Dependent Claim
25 words
A method as in claim 2 wherein said zeolite nucleating mixture consists essentially of 5.0 Na.sub.2 S:10.7 Na.sub.2 O:14.9 SiO.sub.2 :Al.sub.2 O.sub.3 :319 H.sub.2 O.
Claim 5
Dependent Claim
41 words
A method as in claim 2 wherein the molecular formulation of said admixture effective to produce zeolite X is in the range of SiO.sub.2 /Al.sub.2 O.sub.3
2.4-8
Na.sub.2 O/Al.sub.2 O.sub.3
2-8
Na.sub.2 O/Na.sub.2 S
1-5
H.sub.2 O/Na.sub.2 O
greater than 15.
Claim 6
Dependent Claim
41 words
A method as in claim 2 wherein the molecular formulation of said admixture effective to produce zeolite Y is in the range of SiO.sub.2 /Al.sub.2 O.sub.3
3.5-20
Na.sub.2 O/Al.sub.2 O.sub.3
2-10
Na.sub.2 O/Na.sub.2 S
1-5
H.sub.2 O/Na.sub.2 O
greater than 15.
References Cited (Backward Citations)
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US3849463A
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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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |