Processes for preparing concentrated aqueous liquid biocidal compositions

Reference is also made to commonly-owned copending application Ser. No. 09/404,184, filed Sep. 24, 1999; Ser. No. 09/451,319, filed Nov. 30, 1999; Ser. No. 09/456,781, filed Dec. 8, 1999; Ser. No. 09/506,911, filed Feb. 18, 2000; and Ser. No. 09/663,948, filed Sep. 18, 2000. Reference is also made to commonly-owned copending application Ser. No. 09/296,499, filed Apr. 22, 1999. The process involves (a) continuously forming bromine chloride from separate feed streams of bromine and chlorine by maintaining said streams under automatic feed rate control whereby the streams are continuously proportioned to come together to form bromine chloride; (b) continuously forming an aqueous product having an active bromine content of at least 100,000 ppm (wt/wt), a pH of at least 7, and an atom ratio of nitrogen to active bromine greater than 0.93:1 by continuously or intermittently feeding into mixing apparatus separate feed streams of (1) bromine chloride formed in (a), and (2) an aqueous solution of alkali metal salt of sulfamic acid, under automatic feed rate control.