Preparation of spheroidal silico-alumina particles

US3993589A · kind A · utility

Assignee

• Labofina, S.A. · BE

Inventors

• Jacques Andre · Sainte-Geneviève-des-Bois, FR
• Raymond M. Cahen · Brussels, BE
• Henri Robert Debus · Meise, BE
• Rene Odon Lammers · Brussels, BE
• Hugo Van Thillo · Grimbergen, BE

Key dates

• Filing date: Feb 10, 1975
• Grant date: Nov 23, 1976
• Expiry date: Feb 10, 1995

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J37/0018
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for preparing spheroidal silica-alumina particles containing alumina in an amount at least equal to that of silica, comprising dispersing as droplets into a hot and practically water-immiscible fluid, an aqueous mixture comprising an alkali silicate, alumina hydrogel, perchloric acid and a water-soluble monomer whose uncross-linked polymer is water-soluble or forms a gel, alkali silicate and alumina hydrogel being used in proportions corresponding to 0.5 to 50% by weight of SiO.sub.2 and 99.5 to 50% by weight of Al.sub.2 O.sub.3, and maintaining the droplets of the mixture in the fluid until a substantial polymerization of the monomer occurs.