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US 4,428,914 AGranted
Process for making sodium percarbonate granules
AssigneeInterox
InventorsJean Brichard, Jean-Claude Colery
Life of this patent
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Abstract
A process for the production of sodium percarbonate granules comprises the steps of impregnating seeds with an aqueous phase or phases containing sodium percarbonate or its precursors, and evaporating water from the impregnated seeds in a fluidized bed dryer in the presence of at least one condensed phosphate.
Claims11
In a process for the production of sodium percarbonate granules in a fluidized bed comprising the steps of:
- (a) impregnating sodium percarbonate seeds with an aqueous solution of hydrogen peroxide and an aqueous solution of sodium carbonate, and simultaneously
- (b) evaporating water from the impregnating seeds in a fluidized bed dryer in the presence of at least one condensed phosphate, the improvement comprising providing sodium hexametaphosphate as said condensed phosphate and dissolving said condensed phosphate in at least one of said solutions.
Dependencies are inferred from the claim text.