Process for preparing a stabilized sodium carbonate peroxyhydrate
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United States of America Patent
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Issued Date -
Dec 6, 2001
app pub date -
May 8, 2001
filing date -
Jun 26, 1998
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Abandoned
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Abstract
A process for the preparation of a stabilized sodium carbonate peroxyhydrate, in which an aqueous solution of sodium sulphate and a chelating agent is applied to granules of sodium carbonate peroxyhydrate, and the solution is allowed to dry, forming coated granules having a coating layer of sodium sulphate and the chelating agent on the granules. The chelating agent is selected from the group consisting of (poly)aminophosphonic acid derivatives, (poly)aminocarboxylic acid derivatives, and N-bis- and tris-[(1,2-dicarboxy-ethoxy)ethyl]amine derivatives. The stabilized sodium carbonate peroxyhydrate may be prepared by spraying the aqueous solution of sodium sulphate and the chelating agent onto granules of sodium carbonate peroxyhydrate in a fluidized bed.
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