Patent ID: 7939042
Filing Date: 2011-05-10
Classification: C01B,C01D,C02F

Abstract:
1. Process for the preparation of aqueous solutions of high concentration hypobromites, comprising the steps of: a) contacting a concentrated sodium hydroxide aqueous solution with bromine, in a hydroxide-bromine equivalent ratio from 2:1 to 3:1; b) allowing the mixture to react at a temperature from −5 to 10° C., thereby obtaining a solution of unstabilized sodium hypobromite, and sodium bromide; c) adding to said solution of step b) an aqueous solution of sodium sulfamate, at a molar ratio of sulfamate to hypobromite from 1:1 to 2:1, at a temperature from −5° C. to 10° C., whereby to form stabilized sodium hypobromite solution containing sodium bromide; and (d) admixing to said stabilized sodium hypobromite solution an oxidant and reacting said oxidant with said sodium bromide to produce additional sodium hypobromite, thereby obtaining an aqueous solution of high concentration sodium hypobromite.