Process for the production of very fine-particle zeolitic alkali metal aluminum silicates

US5645811A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Peter Kuhm · Hilden, DE
• Rainer Salz · Goldkronach, DE
• Gerhard Blasey · Goldkronach, DE

Key dates

• Filing date: Sep 22, 1995
• Grant date: Jul 8, 1997
• Expiry date: Sep 22, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S423/24
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Finely ground zeolithic alkali metal aluminum silicates having the general formula: xMe.sub.2 O.Al.sub.2 O.sub.3.ySiO.sub.2.zH.sub.2 O, are prepared by mixing both reaction components, alkali metal silicate and alkali metal aluminate, in the presence of a stoichiometrically excessive amount of alkali metal hydroxide. The thus obtained gel is matured, the reaction mixture is heated up to crystallisation temperature, then crystallised. During crystallisation, at least one of both reaction components is added to the reaction mixture.