Method for preparation of silica particles

US5256386A · kind A · utility

Assignee

• Eka Nobel AB · SE

Inventors

• Mats Nystrom · Ytterby, SE
• Wolgang Herrmann · Gothenburg, SE
• Bernt Larsson · Sandviken, SE

Key dates

• Filing date: Jun 14, 1990
• Grant date: Oct 26, 1993
• Expiry date: Jun 14, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B33/16
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Silica particles which are substantially spherical, have a particle size of 1 to 100 .mu.m, a very narrow pore size distribution and a low alkali metal content. The particles can be prepared by sol-gel technique using emulsification technique for drop formation. The process comprises a sol growth step in a basic environment based on ammonium or amines and a post-treatment in such an environment. The silica particles are particularly suitable for use in chromatography as they have very good particle and porosity properties and high purity.