A zeolite synthesis procedure with homogeneous stirring of the synthesis medium allows to reduce both the average and local shear rate and to improve the crystallization process. Examples are provided for the syntheses of high-silica faujasite, hexagonal faujasite and mazzite. The apparatus is easy to scale up for industrial crystallization.

With the industrial scale, the synthesis of zeolites must imperatively be made out of agitated reactor. However a significant parameter of agitation must be taken into account: shearing. Shearing seems to have a harmful effect (when one seeks has a metastable form) on the stability of the zeolite thus synthesized on its purity.