Patent ID: 7303737
Filing Date: 2007-12-04
Classification: C01B

Abstract:
1. A method for point-of-use generation of chlorine dioxide comprising the steps of: providing an aqueous persulfate solution that has a concentration of from 0.01 to 1.0 moles of persulfate per liter, and is buffered to a pH of from 3 to 9; providing an aqueous chlorite solution that has a concentration of from 0.01 to 1.0 moles of chlorite per liter, and is buffered to a pH of from 9 to 12; mixing the persulfate solution and the chlorite solution at a molar ratio of persulfate to chlorite of greater than 2, wherein the concentration of persulfate in the persulfate solution, the concentration of chlorite in the chlorite solution, the pH to which the persulfate solution is buffered, the pH to which the chlorite solution is buffered, and the molar mix ratio of persulfate to chlorite are chosen to generate, within five minutes after the mixing of the persulfate solution and the chlorite solution, a product chlorine dioxide solution having from 2 to 300 parts per million chlorine dioxide and a pH of from 3 to 12.