Patent ID: 7241433

Claim:
A process for the preparation of a coated granular sodium percarbonate, comprising: (i) preparing granular sodium percarbonate by fluidized-bed spray granulation, wherein an aqueous sodium carbonate solution or suspension and an aqueous hydrogen peroxide solution are sprayed in a molar ratio of Na 2 CO 3 to H 2 O 2 in the range from 1:1.4 to 1:1.8 into a fluidized-bed comprising sodium percarbonate particles, at a fluidized-bed temperature T G in the range of from 45 to 75° C., and water is simultaneously evaporated off; (ii) coating said granular sodium percarbonate by spray application, in a fluidised bed, of at least one aqueous solution comprising one or more coating components, with the simultaneous evaporation of water; and (iii) drying said granular sodium percarbonate at a fluidized-bed temperature T NT in the range from greater than 75 to 95° C. that is higher than said fluidized-bed temperature T G , wherein said drying is carried out before the coating, or both before and after the coating.