Patent ID: 6228342
Filing Date: 2001-05-08
Classification: C01B

Abstract:
A process for producing sodium percarbonate particles comprising the steps of:a) introducing a 30 to 50% by weight aqueous hydrogen peroxide solution into a receiving vessel; metering in solid soda in an amount in approximately 1.1 to 0.6 times the molar amount of hydrogen peroxide, and intensively mixing the resulting mixture at a temperature of at most 80.degree. C. for a period sufficient to allow the hydrogen peroxide and soda to react to form a slurry of sodium percarbonate particles having a water content of no more than about 40% by weight;b1) comminuting the particle suspension obtained in step a) by wet comminution to form a ground, homogeneous particle slurry; andb2) immediately thereafter spray drying the ground, homogeneous particle slurry obtained in step b1) and recovering homogeneous sodium percarbonate particles having an active oxygen content of at least 13.5% by weight.