High active oxygen content granulated sodium perborate product and method of making the same

US5094827A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Birgit Bertsch-Frank · Rheinfelden (Baden), DE
• Klaus Mueller · Hanau, DE
• Thomas Lieser · Hanau, DE

Key dates

• Filing date: Aug 20, 1990
• Grant date: Mar 10, 1992
• Expiry date: Aug 20, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B15/126
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The spray drying of a solution containing hydrogen peroxide and sodium metaborate to obtain primary particles which are immediately conveyed after leaving the drying zone to a granulating device and are then granulated in the presence of free and/or perborate water of crystallization. The granulated materials are dried, if necessary. The generally amorphous primary particles are converted into granulated materials with at least partially crystalline structure and significantly improved shelf life. The work is performed with advantage in a spray dryer with integrated fluid bed or in a compressing granulating device. The method is suitable for preparing perborate granulated materials with an active oxygen content of over 10% by weight, especially perborate monohydrate granular materials with 14 to 16% by weight active oxygen. A rapidly dissolving product is produced with an acceptable apparent weight for ease in packaging.