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US 2006/0216223 A1Published application
Batch methods for producing chlorine dioxide solutions
AssigneeNalco Company
InventorFelice DiMascio
Life of this patent
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Abstract
A process for generating aqueous chlorine dioxide solutions includes adding a solid phase alkali metal chlorite, a solid phase acid, and a solid phase oxidizing agent to an aqueous solution, wherein the solid phase acid ahs a pKa less than 4. Also disclosed are compositions for producing chlorine dioxide solutions.
Claims18
A batch process for generating an aqueous solution of chlorine dioxide, the process comprising:
- adding a solid phase alkali metal chlorite salt, a solid phase oxidizing agent and a solid phase acid to an aqueous solution, wherein the solid phase acid has a pKa of less than 4.0;
- and
- generating chlorine dioxide in the aqueous solution.
A point of use process for producing a chlorine dioxide solution, the process comprising:
- adding a solid phase alkali metal chlorite salt, a solid phase oxidizing agent consisting of dichlorocyanurate, and a solid phase acid to an aqueous solution, wherein the solid phase acid has a pKa of less than 4;
- and
- generating chlorine dioxide in the solution, wherein the chlorine dioxide solution has a concentration that remains substantially the same after a period of 90 days.
A process for generating chlorine dioxide in solution, comprising:
- adding a first solid phase material consisting essentially of an acid and a second solid phase material consisting essentially of a mixture of an alkali metal chlorite and an alkali metal hypochlorite to an aqueous solution;
- and
- dissolving the first and second solid phase materials and generating chlorine dioxide in the aqueous solution.
Dependencies are inferred from the claim text.