Process for producing faujasitic-type crystalline zeolites
US3949059A · kind A · utility
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5References
5Claims
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Key dates
| Filing date | Oct 10, 1973 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Oct 10, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/21
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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 EQU 3-10 Na.sub.2 S: 5-15 Na.sub.2 O: 5-50 SiO.sub.2 : 0.4-4.0 Al.sub.2 O.sub.3 : 50-500 H.sub.2 O is added to the reaction mixture to promote crystalline zeolite formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.