Method and compositions for the production of chlorine dioxide

Claim 1

A method of producing chlorine dioxide comprising: combining in a first aqueous solution an aqueous soluble chlorite salt, an aqueous soluble acid and an aqueous soluble hydroxyl free aldehyde disproportionation agent, said chlorite salt, said acid and said aldehyde disproportionation agent being included in said first solution in concentrations effective in combination to produce chlorine dioxide in a concentration of at least about 5 parts per million after a period of about ten minutes, said first solution having an initial pH of about 5.0 or less, said first solution producing at least twice the concentration of chlorine dioxide after said period compared to a second aqueous solution identical to said first solution except that an aldose disproportionation agent is substituted for said aldehyde disproportionation agent in said second solution at the same molar concentration said aldehyde disproportionation agent is included in said first solution.

Claim 2

A method of producing chlorine dioxide comprising: combining in a first aqueous solution an aqueous soluble chlorite salt, an aqueous soluble acid and an aqueous soluble hydroxyl free aldehyde disproportionation agent, said chlorite salt, said acid and said aldehyde disproportionation agent being included in said first solution in concentrations effective in combination to produce chlorine dioxide in a concentration of at least about 5 parts per million after a period of about ten minutes, said first solution having an initial pH of about 5.0 or less, said first solution producing at least twice the concentration of chlorine dioxide after said period compared to a second aqueous solution identical to said first solution except that an aldose disproportionation agent is substituted for said aldehyde disproportionation agent in said second solution at the same molar concentration said aldehyde disproportionation agent is included in said first solution.

Claim 11

A method of producing chlorine dioxide comprising: combining in a first aqueous solution an aqueous soluble chlorite salt, an acid selected from the group consisting of an aqueous soluble bisulfate salt, sulfamic acid, maleic acid, phosphoric acid, ethylenediaminetetraacetic acid, monosodium ethylenediaminetetracetic acid and mixtures thereof and an aldehyde disproportionation agent selected from the group consisting of acetaldehyde, propionaldehyde, glutaraldehyde, 2-furfural, and mixtures thereof, said chlorite salt, said acid and said disproportionation agent being included in said first solution in concentrations effective in combination to produce chlorine dioxide in a concentration of at least about 5 parts per million after a period of about ten minutes, said first solution having an initial pH of about 5.0 or less, said first solution producing at least twice the concentration of chlorine dioxide after said period compared to a second aqueous solution identical to said first solution except that an aldose disproportionation agent is substituted for said aldehyde disproportionation agent in said second solution at the same molar concentration said aldehyde disproportionation agent is included in said first solution.

Claim 12

A method of producing chlorine dioxide comprising: combining in a first aqueous solution an aqueous soluble chlorite salt, an acid selected from the group consisting of an aqueous soluble bisulfate salt, sulfamic acid, maleic acid, phosphoric acid, ethylenediaminetetraacetic acid, monosodium ethylenediaminetetracetic acid and mixtures thereof and an aldehyde disproportionation agent selected from the group consisting of acetaldehyde, propionaldehyde, glutaraldehyde, 2-furfural, and mixtures thereof, said chlorite salt, said acid and said disproportionation agent being included in said first solution in concentrations effective in combination to produce chlorine dioxide in a concentration of at least about 5 parts per million after a period of about ten minutes, said first solution having an initial pH of about 5.0 or less, said first solution producing at least twice the concentration of chlorine dioxide after said period compared to a second aqueous solution identical to said first solution except that an aldose disproportionation agent is substituted for said aldehyde disproportionation agent in said second solution at the same molar concentration said aldehyde disproportionation agent is included in said first solution.

Claim 21

A method of producing chlorine dioxide comprising combining an amount of an aqueous soluble chlorite salt in solution with an amount of an acid selected from the group consisting of an aqueous soluble bisulfate salt, sulfamic acid, maleic acid, phosphoric acid, ethylenediaminetetraacetic acid, monosodium ethylenediaminetetracetic acid and mixtures thereof in combination with an amount of a hydroxyl-free aldehyde disproportionation agent selected from the group consisting of glutaraldehyde, propionaldehyde, acetaldehyde, benzaldehyde and 2-furfural effective to produce chlorine dioxide in a concentration of at least about 5 parts per million, said solution after combining said chlorite salt, said acid and said disproportionation agent having an initial pH of less than about 4.5, said disproportionation agent substantially increasing the rate of formation of chlorine dioxide and minimizing residual chlorite in said solution in comparison to methods which otherwise the same except utilizing aldose disproportionation agents rather than hydroxyl-free aldehyde disproportionation agents.

Claim 22

A method of producing chlorine dioxide comprising combining an amount of an aqueous soluble chlorite salt in solution with an amount of an acid selected from the group consisting of an aqueous soluble bisulfate salt, sulfamic acid, maleic acid, phosphoric acid, ethylenediaminetetraacetic acid, monosodium ethylenediaminetetracetic acid and mixtures thereof in combination with an amount of a hydroxyl-free aldehyde disproportionation agent selected from the group consisting of glutaraldehyde, propionaldehyde, acetaldehyde, benzaldehyde and 2-furfural effective to produce chlorine dioxide in a concentration of at least about 5 parts per million, said solution after combining said chlorite salt, said acid and said disproportionation agent having an initial pH of less than about 4.5, said disproportionation agent substantially increasing the rate of formation of chlorine dioxide and minimizing residual chlorite in said solution in comparison to methods which otherwise the same except utilizing aldose disproportionation agents rather than hydroxyl-free aldehyde disproportionation agents.