Method for the preparation of stabilized sodium percarbonate

US5632965A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Claas-Juergen Klasen · Alzenau, DE
• Birgit Bertsch-Frank · Rheinfelden (Baden), DE
• Thomas Lieser · Hanau, DE
• Peter J. Schubert · Carmel, US
• Klaus Mueller · Hanau, DE

Key dates

• Filing date: Sep 28, 1995
• Grant date: May 27, 1997
• Expiry date: Sep 28, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D17/0039
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a method for increasing the storage stability of sodium percarbonate (2 Na.sub.2 CO.sub.3.3 H.sub.2 O.sub.2) by coating with a sodium perborate. According to the present invention wet sodium percarbonate salt, obtained by reacting sodium carbonate with hydrogen peroxide in aqueous phase and separating the salt from the aqueous phase, is treated with a solution or suspension containing sodium perborate in a solid-liquid separator by a kind of displacement wash. In contrast to previously known methods, according to the present invention a greater storage stability is attained with smaller quantities of perborate coating.