Method of preparing crystalline zeolitic aluminosilicates

US4606900A · kind A · utility

Assignee

• Sud Chemie, Inc. · US

Inventors

• Harmut Kacirek · Norderstedt, DE
• Andreas Meyer · Speichersdorf, DE

Key dates

• Filing date: Jan 24, 1985
• Grant date: Aug 19, 1986
• Expiry date: Jan 24, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S423/22
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

There is disclosed an improvement in the preparation of a crystalline zeolitic aluminosilicate with an atomic Si-to-Al ratio .gtoreq.10 by hydrothermal crystallization from a reaction batch that contains SiO.sub.2 and Al.sub.2 O.sub.3 or their hydrated derivatives or alkali silicates and aluminates along with crystallization accelerators and optionally in the copresence of a quaternary ammonium compound amino or mixture of alcohol and ammonia, in an aqueous and alkaline medium, the improvement wherein an aged but still X-ray amorphous aluminosilicate nucleating gel with an atomic Si-to-Al ratio .gtoreq.10 is added to the reaction batch as a crystallization accelerator.