Granular sodium carbonate obtained by fluid-bed spray granulation and a process for its production
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United States of America Patent
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May 9, 2006
Grant Date -
Apr 11, 2002
app pub date -
Sep 25, 2001
filing date -
Sep 29, 2000
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Abstract
The invention relates to a process for the production, by fluid-bed spray granulation, of granular sodium percarbonate having a low TAM value. According to the invention, in the fluid-bed spray granulation, an Mg compound in a quantity of 50 to 2,000 ppm, in particular 100 to 1,000 ppm, or/and a complexing agent from among the hydroxycarboxylic acids, aminocarboxylic acids, aminophosphonic acids and phosphonocarboxylic acids, hydroxyphosphonic acids and their alkali metal salts, ammonium salts or Mg salts, in a quantity of 50 to 2,000 ppm, in particular 200 to 1,000 ppm, are added as stabilisers to the soda solution and/or H.sub.2O.sub.2 solution. Preferably a combination of an Mg compound in a quantity of 100 to 1,000 ppm Mg.sup.2+ and waterglass in a quantity of 0.1 to 1 wt. %, in particular 0.1 to 0.5 wt. %, is used, and in this case granules having a TAM value of about or below 6 .mu.W/g and simultaneously a short dissolving time, are obtainable.
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