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

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

G U NT GG1G2 GnG2 Gn GGUNTUNT GThe 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 Tin the range from 45 to 75° C., and the coating is effected by the...

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Hauptverfasser: Jakob, Harald, Hessberger, Waldemar, Lattich, Juergen, Overdick, Ralph
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Sprache:eng
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creator Jakob, Harald
Hessberger, Waldemar
Lattich, Juergen
Overdick, Ralph
description G U NT GG1G2 GnG2 Gn GGUNTUNT GThe 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 Tin 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 Tin 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 Tof greater than T, or b) the fluidized-bed granulation is carried out in at least two steps at T, T. . . T, Tor Tbeing higher than T1, and drying being unnecessary if ⅔ of the granulate have been formed at T1, or c) drying takes place not after the granulation but after the coating, at T, Tbeing at least 20° C. higher than T.
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title Process for the preparation of coated granular sodium percarbonate, and product obtainable by the process
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