Patent ID: 6238643
Filing Date: 2001-05-29
Classification: A61L,C01B

Abstract:
A method of producing an aqueous solution of chlorine dioxide comprising:a) providing liquid water in a first zone and a mixture of at least one metal chlorite and at least one acid forming component in a second zone, wherein the second zone is enclosed at least in part by a water-permeable membrane, and the acid forming component is selected from the group consisting of water soluble acids, water soluble acid salts, synthetic molecular sieves, acid ion exchange resins, acid treated clays and acid treated calcined clays, and wherein said at least one metal chlorite and said at least one acid forming component in said mixture react with each other in the presence of water but not in the substantial absence of water to produce chlorine dioxide;b) contacting said membrane with water from said first zone such that the liquid water and/or water vapor passes through said membrane into said second zone thereby facilitating the reaction between said at least one acid forming component and said at least one metal chlorite to produce chlorine dioxide; andc) allowing the chlorine dioxide produced in the second zone to pass out through said membrane to the first zone into the liquid water to produce said aqueous solution.