Process for preparing crystalline silicas

US4772456A · kind A · utility

Assignee

• Labofina, S.A. · BE

Inventors

• Georges E. M. J. DeClippeleir · Sint-Pieters-Leeuw, BE
• Raymond M. Cahen · Brussels, BE
• Hugo Van Thillo · Grimbergen, BE
• Guy Debras · Les Bons Villers, BE

Key dates

• Filing date: Dec 19, 1983
• Grant date: Sep 20, 1988
• Expiry date: Dec 19, 2003

Classification

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

Abstract

Disclosed is a process for preparing crystalline silicas having the monoclinic symmetry which comprises the step of calcining in air for at least 3 hours at a temperature of at least 500.degree. C. a crystalline silica of the silicalite type having a silica to alumina atomic ratio of at least 80.