Sodium tripolyphosphate manufacture
AssigneeFMC Corporation
InventorLawrence A. Shimp
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Abstract
In the manufacture of sodium tripolyphosphate, the make up liquor containing the requisite sodium and phosphorus values, is treated with from about 0.01 to 0.1 weight percent of hydrogen peroxide before the liquor is heated to form sodium tripolyphosphate. The hydrogen peroxide treatment prevents dark oily impurities from forming on the surface of aqueous solutions of the sodium tripolyphosphate thus treated.
Claims5
In the process of producing sodium tripolyphosphate wherein a make up liquor of sodium orthophosphate is made up having an Na:P ratio of about 5:3 and heated in a heating zone to produce sodium tripolyphosphate, the improvement comprising adding to said make up liquor from about 0.01 to about 0.1 weight percent of hydrogen peroxide, based on the final weight of the sodium tripolyphosphate produced, and allowing the treated make up liquor to remain for at least about 30 minutes before being heated in said heating zone, whereby dark oily residues are prevented from forming on the surface of an aqueous solution of said sodium tripolyphosphate.
Dependencies are inferred from the claim text.