Continuous process for manufacturing crystalline zeolites in continuously stirred backmixed crystallizers
US4818509A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1986 |
| Grant date | Apr 4, 1989 |
| Priority date | — |
| Expiry date | Oct 21, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B39/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A continuous process is described for manufacturing a wide variety of zeolites having selected crystal sizes and other desired characteristics. Selected raw materials are fed to a precursor tank of relatively large capacity, wherein the resultant zeolite precursor slurry is held at temperatures of up to 180.degree. F. for 4-16 hours, with high shear agitation, as an induction period. The slurry is sent to a plurality of crystallization tanks before it possesses a total solids content exceeding 10% by weight and a crystalline content exceeding 15% by weight of the total solids content. The crystallization tanks are preferably operated in two stages. The first crystallizing stage is held at a temperature of 180.degree.-250.degree. F. for 2-72 hours. The second crystallizing stage is held at a temperature greater than 250.degree. F. for 2-16 hours.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.