Process for the production of zeolite A
US4339420A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Feb 24, 1981 |
| Grant date | Jul 13, 1982 |
| Priority date | — |
| Expiry date | Feb 24, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/24
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Crystalline zeolite powder of Type A is employed as a phosphate substitute in washing agents. For this use, it is advantageous if the crystalline zeolite powder of Type A has a specific average particle diameter of 4.3 to 8.5.mu. as well as a specifically narrow particle size distribution. By a specific sequence in the addition of the reactants in the precipitation of zeolites A this requirement of the product is fulfilled. Thereby water is present in a receiver and there are simultaneously added sodium aluminate liquor and waterglass solution and subsequently after a long stirring phase there are added further sodium aluminate liquor and further waterglass solution. The maximum grit content of the zeolite powder of Type A obtained is 0.2%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.