Merck Patent Gesellschaft MIT Beschrankter Haftung

Sto Se & Co. Kgaa

Michael Grebner

Klaus Unger

Ferdi Schuth

Axel Reich

Horst Reichert

Jan-Karsten Meier

The invention relates to a process for the preparation of crystalline clathrasil of the dodecasil 1 H structural type having an average crystal size of not more than 20 .mu.m, characterised in that an alkaline aqueous silicate-containing medium comprising templates and crystallisation seeds is heat-treated, the crystallisation seeds content, relative to the SiO.sub.2 content of the medium, being not less than 1% by weight.

Clathrasil of the dodecasil 1 H structural type having a small average

The invention relates to a process for the preparation of low-template clathrasil, comprising heat-treating an alkaline aqueous silicate-containing medium containing crystallization seeds and an amount of a template such that the template content of the clathrasil, relative to the number of moles of the SiO.sub.2 of the medium, is less than 2 mol %.

Low-template clathrasil

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Mainz, Germany

Michael Grebner