Preparation and Coating Method of Sodium Carbonate Hydrate Stable in Detergent Formulations (PROCESS FOR MANUFACTURING AND COATING SODIUM CARBONATE PERHYDRATE TO BE STABLE IN DETERGENT FORMULATIONS)

摘要

A process for the preparation and coating of sodium carbonate dihydrate containing 10.5% to 14% active oxygen, which is stable in a non-phosphate detergent composition and has a bulk density of 900 to 1,050 kg / m3. Anhydrous sodium carbonate having a pore volume of 0.29 ml / g or more is contacted with 50 to 75% by weight of hydrogen peroxide in the presence of 1-hydroxyethylidene-1,1-diphosphonic acid, Water is evaporated. The product is coated by spraying sodium borosilicate at a rate that does not wet the particles.