Methods for the preparation of concentrated aqueous bromine solutions and high activity bromine-containing solids
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United States of America Patent
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Dec 18, 2007
Grant Date -
Nov 10, 2005
app pub date -
May 10, 2004
filing date -
May 10, 2004
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Abstract
The invention includes convenient methods of preparing: (1) highly concentrated liquid bromine-containing biocidal solutions, (2) highly concentrated mixed halogen liquid bromine and chlorine-containing biocidal solutions, and (3) high-activity bromine-containing biocidal solids, all having excellent physical and chemical stability. One method yields solutions that have concentrations of bromine in excess of 18% as Br.sub.2 (8% as Cl.sub.2) in which the mole ratio of hydroxide ion to hydrogen ion source is at least 1.9:1. Another method employs elemental bromine in conjunction with a solid organic or inorganic halogenating agent to yield halogen solutions at concentrations greater than 22.9% as Br.sub.2 (10.2% as Cl.sub.2). This method can be performed under conditions that exceed the solubility of the active ingredient such that it crystallizes and is recovered as a hydrated or anhydrous salt in good yield.
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