Method for producing sodium percarbonate

US6248707A · kind A · utility

Assignee

• Solvay Interox GmbH · GB

Inventors

• Werner Doetsch · Homborn, DE
• Manfred Mathes · Homborn, DE
• Helmut Honig · Geretsried, DE
• Gabriele Wasem · Eschborn, DE

Key dates

• Filing date: Aug 13, 1999
• Grant date: Jun 19, 2001
• Expiry date: Aug 13, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D17/065
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A method for the "dry" production of sodium percarbonate (dry process), in which monohydrate crystals of sodium carbonate are reacted with a quasi-stoichiometric quantity of concentrated aqueous hydrogen peroxide solution, relative to the quantity of active oxygen required in the sodium percarbonate to be produced. This method can be combined to great advantage with subsequent compaction of the sodium percarbonate obtained. Sodium percarbonate products containing varying concentrations of active oxygen of at least 10 weight percent, particularly high active oxygen concentrations of above 14.5 weight percent, can be produced. The resulting sodium percarbonate products are distinguished in that they have remarkably advantageous dissolution rates, stabilities and compatibility with detergent bases, and are superior to conventional sodium percarbonates obtained, for example, by a crystallization process. The invention also relates to the sodium percarbonate products obtained and to detergent compositions containing such sodium percarbonate products.