US5154904A
Expired / Lapsed
US
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Process for the production of a seed mixture for the synthesis of faujasite
Assignee: Evonik Operations GmbH
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Filing: 1986-10-28
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Granted: 1992-10-13
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Expires: 2006-10-28
Abstract
Abstract Precipitated silica is mixed with a solution of caustic soda, water and sodium aluminate to form a mixture of the composition: 12±3 Na 2 O:Al 2 O 3 :12±3 SiO 2 :200±60 H 2 O. This mixture was aged for 18-72 hours.
Inventors
- 👤 Peter Kleinschmit
- 👤 Gangolf Kriechbaum
- 👤 Hans Strack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:37
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B39/20; Y; Y10; Y10S; Y10S423/00; Y10S423/21
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
157 words
A process for the production of a seed mixture for the synthesis of faujasite comprising the steps of a) diluting aqueous sodium hydroxide with water to a solution of 300-600 grams of Na 2 O per liter of solution: b) heating the diluted aqueous sodium hydroxide to a temperature of 50° to 80° C. and maintaining that temperature while; c) adding precipitated silica to the diluted aqueous sodium hydroxide; d) allowing the aqueous sodium hydroxide/silica mixture obtained in step (c) to cool or maintaining a temperature of 30° to 70° C.; e) adding aqueous sodium aluminate liquor to the mixture obtained in step (d); f) aging the aqueous sodium hydroxide/silica/sodium aluminate mixture obtained in step (c) at 30°-40° C. for 18-72 hours; wherein the precipitated silica and sodium aluminate are added in amounts such that, after step (e), the mixture has a composition Na 2 O:Al 2 O 3 :SiO 2 :H 2 O equal to (9-15):(1):(9-15):140-260.
Claim 2
Dependent Claim
157 words
A process for the production of a seed mixture for the synthesis of faujasite comprising the steps of a) diluting aqueous sodium hydroxide with water to a solution of 300-600 grams of Na 2 O per liter of solution: b) heating the diluted aqueous sodium hydroxide to a temperature of 50° to 80° C. and maintaining that temperature while; c) adding precipitated silica to the diluted aqueous sodium hydroxide; d) allowing the aqueous sodium hydroxide/silica mixture obtained in step (c) to cool or maintaining a temperature of 30° to 70° C.; e) adding aqueous sodium aluminate liquor to the mixture obtained in step (d); f) aging the aqueous sodium hydroxide/silica/sodium aluminate mixture obtained in step (c) at 30°-40° C. for 18-72 hours; wherein the precipitated silica and sodium aluminate are added in amounts such that, after step (e), the mixture has a composition Na 2 O:Al 2 O 3 :SiO 2 :H 2 O equal to (9-15):(1):(9-15):140-260.
Claim 3
Dependent Claim
43 words
The process according to claim 1, wherein, after step (e), the mixture has a composition Na 2 O:Al 2 O 3 :SiO 2 :H 2 O equal to (11.5 to 13.5):(1):(11.5 to 13.5):(200) and the ratio (Na O ):(SiO 2 ) equals 1:1.
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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) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |