Chlorine dioxide generation method
AssigneeBio-Chem Resources
InventorsFrederick P. Mussari, David Francis, Wilfried Schmitz
Life of this patent
Estimating the term…
Abstract
A method generating chlorine dioxide is provided. The method uses sodium chlorite solution and diluted sulfuric acid to generate chlorine dioxide with a significantly higher rate of conversion of chlorite to chorine dioxide than has been previously reported with sulfuric acid/chlorite chlorine dioxide generation.
Claims19
A two chemical conversion method for preparing chlorine dioxide, comprising:
- reacting a 7.5-25 weight % aqueous sodium chlorite solution with a 20-50 weight % aqueous sulfuric acid as sole constituents in a reaction chamber sized to allow the aqueous sodium chlorite solution and the aqueous sulfuric acid to react for about 5 seconds to about 300 seconds to form a reaction mixture comprising chlorine dioxide in which 75% or more and 85% or less of chlorite ion in the sodium chlorite solution is converted to chlorine dioxide.
A method for generating chlorine dioxide, comprising:
- introducing an aqueous sodium chlorite solution and an aqueous sulfuric acid separately into a reactor as sole constituents, and
- reacting the aqueous sodium chlorite with the aqueous sulfuric acid to form a reaction mixture by converting 75% or more and 85% or less of chlorite ions to chlorine dioxide,
- wherein the aqueous sodium chlorite solution has a concentration in the range of 7.5-25% by weight, and the aqueous sulfuric acid has a concentration in the range of 20-50% by weight.
A method for preparing chlorine dioxide, comprising:
- reacting a 7.5-25 weight % aqueous sodium chlorite solution with a 20-50 weight % aqueous sulfuric acid solution as sole constituents in a reactor for 5 to 300 seconds to obtain a reaction mixture in which 81.5% or more and 85% or less of chlorite ion in the aqueous sodium chlorite solution is converted to chlorine dioxide.
The method of 14, further comprising:
- diluting a concentrated sulfuric acid to approximately 50% by weight aqueous sulfuric acid solution and cooling the aqueous sulfuric acid solution and using the resulting cooled, diluted sulfuric acid in the reacting step.
The method of 14, further comprising storing the reaction mixture in the reactor for about 1 to 15 minutes without a significant conversion of the chlorine dioxide to chlorate.
The method of 14, further comprising discharging the reaction mixture to a treatment stream via a discharge opening of the reactor.
Dependencies are inferred from the claim text.