Process for preparing stabilized sodium percarbonate

US4117087A · kind A · utility

Assignee

• Peroxid-Chemie GmbH · DE

Inventors

• Helmut Dillenburg · Rheinberg, DE
• Wilhelm Moser · Markdorf, DE
• Robert D. Jones · Pearland, US

Key dates

• Filing date: May 17, 1977
• Grant date: Sep 26, 1978
• Expiry date: May 17, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B15/106
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Stabilized crystalline sodium percarbonate is prepared by reacting a soda solution or suspension, which has a pH value of between 10 and 11 and contains an amount of a soluble silicate, e.g., sodium waterglass, which is equivalent to from about 0.2 to about 0.9% of SiO.sub.2 relative to the sodium percarbonate, with a hydrogen peroxide solution which contains a heavy metal complexing agent, allowing to crystallize at least 50% of the sodium percarbonate and then adding to the resulting suspension a second amount of a water soluble silicate which is equivalent to from about 0.2 to about 0.8% of SiO.sub.2 relative to the sodium percarbonate and is sufficient to provide a silicate content in the final product equivalent to 0.5 to 1.5% of SiO.sub.2.