Method for producing granulated sodium percarbonate

US5560896A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Martin Bewersdorf · Gelnhausen, DE
• Claas-Jurgen Klasen · Alzenau, DE
• Petra Look-Herber · Hanau, DE
• Birgit Bertsch-Frank · Rheinfelden (Baden), DE
• Thomas Lieser · Hanau, DE
• Klaus Muller · Wiesbaden, DE

Key dates

• Filing date: Jun 1, 1995
• Grant date: Oct 1, 1996
• Expiry date: Jun 1, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B15/103
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Sodium percarbonate is produced by means of fluidized bed granulation. The process includes spraying an aqueous sodium carbonate solution and a hydrogen peroxide solution onto nuclei in a fluidized bed and evaporating the water. In the process of the invention, it is not necessary to use a phosphorus-containing crystallization inhibitor in order to avoid cloggings and incrustations in and on the nozzle. This is accomplished by spraying the solutions through separate channels in a single ternary atomizer nozzle, to provide external mixing of the solutions with respect to the nozzle.