Production of concentrated biocidal solutions

Abstract

The production process comprises A) forming an acidic aqueous solution comprising alkali metal cations, bromide anions, and sulfamate anions; B) feeding into said aqueous solution a source of alkali metal cations and chlorine-containing bromide oxidant proportioned to keep the resultant aqueous medium acidic and to form an acidic product solution containing at least about 5 wt % of active bromine, and C) raising the pH of the aqueous product solution with water-soluble base to at least about 10.

That which is claimed is:  
     
         1 . A process of producing a concentrated liquid biocide composition, which process comprises: 
 A) forming an acidic aqueous solution comprising alkali metal cations, bromide anions, and sulfamate anions;    B) feeding into said aqueous solution a source of alkali metal cations and chlorine-containing bromide oxidant selected from the group consisting of (a) chlorine and (b) a compound capable of oxidizing a bromide to bromine and containing at least one chlorine atom in the molecule, proportioned to keep the resultant aqueous medium acidic and to form an acidic product solution containing at least about 5 wt % of active bromine;    C) raising the pH of the aqueous product solution with water-soluble base to at least about 10 to thereby form a precipitate; and    D) removing precipitate from the product solution of C).    
     
     
         2 . A process of  claim 1  wherein the chlorine-containing bromide oxidant used in B) is chlorine.  
     
     
         3 . A process of  claim 1  wherein in C) the pH is raised to about 10.8.  
     
     
         4 . A process of  claim 3  wherein the chlorine-containing bromide oxidant used in B) is chlorine.