Process for producing granulated sodium percarbonate

Details Process for producing granulated sodium percarbonate Process for producing granulated sodium percarbonate

C - Chemistry, Metallurgy

01

B

C01B 15/10 (2006.01) B01D 1/20 (2006.01) B01J 2/04 (2006.01) B01J 2/16 (2006.01) B05B 7/06 (2006.01)

Patent

CA 2170599

Sodium percarbonate of the formula 2 Na2CO33 H2O2 can be produced by fluidised-bed spray granulation by spraying an aqueous solution of sodium carbonate and a hydrogen peroxide solution on sodium percarbonate seeds and evaporating water. The previously necessary use of phosphorous-containing crystallisation inhibitor to prevent blockages and incrustations in and on the nozzle can be avoided by the invention if the solutions are sprayed using a single three- substance pulverisation nozzle with the external mixing of the solutions.

Pour produire du percarbonate de sodium de la formule 2 Na2CO3<.>3 H2O2, par granulation par pulvérisation sur lit fluidisé, on pulvérise une solution aqueuse de carbonate de sodium et une solution d'eau oxygénée sur des germes de percarbonate de sodium et on vaporise de l'eau. La pulvérisation des solutions à l'aide d'un seul ajutage de diffusion ternaire et le mélange externe des solutions permettent d'éviter d'avoir recours, comme c'était le cas jusqu'à présent, à un inhibiteur de cristallisation contenant du phosphore pour empêcher les engorgements et les incrustations.

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