Preparation of crystalline 4A zeolites
US5474753A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 1994 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | May 16, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/24
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Crystalline 4A zeolites having high calcium ion exchange capacity, well adapted as builder materials for detergent compositions, are prepared by directly admixing an aqueous sodium silicate solution with a first aqueous sodium aluminate solution in a first reaction vessel to form a hydrogel therefrom, and transferring the hydrogel thus formed to a discrete crystallization zone and therein contacting such hydrogel with a crystallization-effecting amount of a second aqueous sodium aluminate solution to convert same into a crystalline 4A zeolite, and, advantageously, filtering, washing and optionally drying such crystalline 4A zeolite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.