Method of preparing storage-stable aqueous sodium peroxymonsulfate solutions

US5250280A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Birgit Bertsch-Frank · Rheinfelden (Baden), DE
• Axel Düker · Rübhausen, DE
• Friedrich Bittner · Bad Soden, DE
• Gert Rossler · Münstermaifeld, DE

Key dates

• Filing date: Jun 28, 1991
• Grant date: Oct 5, 1993
• Expiry date: Jun 28, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B15/08
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Previously known peroxymonosulfate solutions exhibit an unsatisfactory storage stability and/or can only be used with technical limitations. According to the invention, storage-stable, aqueous sodium peroxymonosulfate solutions can be prepared with a content of 5% to 50% by weight NaHSO.sub.5 in an economic manner by means of the partial neutralization of a solution containing sulfuric acid and Caro's acid if a such a solution containing H.sub.2 SO.sub.4 and H.sub.2 SO.sub.5 is added which contains less than 3 parts by weight hydrogen peroxide per 100 parts by weight Caro's acid and the partial neutralization is carried out up to an equivalent proportion of total SO.sub.3 to sodium ions in a range of 1 to 1 up to 1 to 1.3 and if the solution is diluted or concentrated as required.