PRODUCTION OF STABILIZED GRANULAR SODIUM PERCARBONATE

PURPOSE:To produce granular sodium percarbonate having excellent slubility and storage stability, easily, by reacting Na2CO3 with H2O2 in an aqueous solution containing a silicate, etc., and adding a specific amount of a stabilizer such as a solicate to the obtained crystal. CONSTITUTION:Granular so...

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Hauptverfasser: ITOU YOSHIROU, HASHIMOTO AKIHIRO
Format: Patent
Sprache:eng
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Zusammenfassung:PURPOSE:To produce granular sodium percarbonate having excellent slubility and storage stability, easily, by reacting Na2CO3 with H2O2 in an aqueous solution containing a silicate, etc., and adding a specific amount of a stabilizer such as a solicate to the obtained crystal. CONSTITUTION:Granular sodium percarbonate having an average particle diameter of 150-2,000mu can be produced by reacting Na2CO3 with H2O2 in an aqueous solution containing at least the above components in the presence of 0.005- 0.5(wt)% silicic acid (in terms of Si), 0.005-0.1% magnesium salt (Mg), and 0.005-0.4% phosphoric aicd or phosphate (P), based on the produced sodium percarbonate. The produced granular sodium percarbonate is separated, mixed with a stabilizer containing two or more components selected from 0.005-0.1% silicic acid (Si), 0.005-0.2% magnesium salt (Mg) and 0.05-0.6% phosphoric acid or phosphate (P), based on the dried weight of the sodium percarbonate, and dried to obtain the stabilized product.