Process for the preparation of coated granular sodium percarbonate, and product obtainable by the process

The invention relates to a process for the preparation of coated granular sodium percarbonate having a low TAM value. The preparation is carried out by fluidized-bed spray granulation at a temperature TG in the range from 45 to 75° C., and the coating is effected by the spray application of an aqueo...

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Bibliographische Detailangaben
Hauptverfasser:	HESSBERGER WALDEMAR, OVERDICK RALPH, LATTICH JUERGEN, JAKOB HARALD
Format:	Patent
Sprache:	eng
Schlagworte:	ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL CANDLES CHEMISTRY COMPOUNDS THEREOF DETERGENT COMPOSITIONS DETERGENTS FATTY ACIDS THEREFROM INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PERFORMING OPERATIONS PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL RECOVERY OF GLYCEROL RESIN SOAPS SOAP OR SOAP-MAKING SPRAYING OR ATOMISING IN GENERAL TRANSPORTING USE OF SINGLE SUBSTANCES AS DETERGENTS
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Beschreibung
Zusammenfassung:	The invention relates to a process for the preparation of coated granular sodium percarbonate having a low TAM value. The preparation is carried out by fluidized-bed spray granulation at a temperature TG in the range from 45 to 75° C., and the coating is effected by the spray application of an aqueous solution containing at least one coating component in a fluidized bed at a temperature TU in the range from 35 to 100° C. According to the invention, a) after the fluidized-bed spray granulation but before the coating, drying is carried out at TNT of greater than TG, or b) the fluidized-bed granulation is carried out in at least two steps at TG1, TG2 . . . TGn, TG2 or TGn being higher than TG1, and drying being unnecessary if 2/3 of the granulate have been formed at TG1, or c) drying takes place not after the granulation but after the coating, at TUNT, TUNT being at least 20° C. higher than TG.