Method for producing zeolites
US4341748A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1980 |
| Grant date | Jul 27, 1982 |
| Priority date | — |
| Expiry date | Jul 15, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/29
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
As synthesized by previous methods, ZSM-5 or ZSM-11 zeolites are crystallized in the presence of substantial amounts of a nitrogen-containing compound. When synthesized in this way, they contain an organic ammonium cation as well as a metal cation such as sodium. To obtain a more active form, the sodium ion must be exchanged out. Such exchange, especially with ZSM-5 and ZSM-11, is difficult unless there is calcination of the zeolite to remove the obstructing organo compounds. By making these zeolites in the presence of (1) seeds of the desired zeolite, (2) mixtures of them with ammonium hydroxide and/or alcohol, (3) the alcohol per se or (4) mixtures of the alcohol with ammonium hydroxide, a product substantially deficient in organic ammonium cation is obtained. These products can be exchanged directly without any calcination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.