Method of producing chlorine dioxide using sodium chlorite and a water-retaining substance impregnated in zeolite or in aqueous solution

A method for producing chloride dioxide, including the steps of:

• (a) providing impregnated zeolite crystals which have been impregnated with a metal chlorite;
• and
• (b) activating the impregnated zeolite crystals with excess protons, thereby producing chlorine dioxide as a result of reaction of the protons with the impregnated zeolite crystals;
• wherein step (b) includes the step of activating a proton generating species to produce the excess protons, the proton generating species comprises a metal salt, and the step of activating said proton generating species is accomplished by exposing the metal salt to water.

A method for filtering a fluid containing a contaminant, including the steps of:

• (a) moving the fluid through a first bed of impregnated zeolite crystals which have been impregnated with one of at least one proton generating impregnating agent and a metal chlorite;
• and
• (b) after step (a), moving the fluid through a second bed of impregnated zeolite crystals which have been impregnated with another one of at least one proton generating impregnating agent and a metal chlorite, wherein chloride dioxide is produced as a result of the chemical reaction of said at least one proton generating impregnating agent;
• wherein the fluid includes water and said at least one proton generating impregnating agent includes a metal salt.

A method for filtering a fluid containing a contaminant, including the steps of:

• (a) moving the fluid through a first bed of impregnated zeolite crystals which have been impregnated with one of at least one proton generating impregnating agent and a metal chlorite;
• and
• (b) after step (a), moving the fluid through a second bed of impregnated zeolite crystals which have been impregnated with another one of at least one proton generating impregnating agent and a metal chlorite, wherein chloride dioxide is produced as a result of the chemical reaction of said at least one proton generating impregnating agent;
• wherein the first bed of impregnated zeolite crystals have been impregnated with said at least one proton generating impregnating agent and the second bed of impregnated zeolite crystals have been impregnated with said metal chlorite and at least one impregnating agent selected from the group consisting of calcium chloride, magnesium sulfate, potassium chloride, and potassium hydroxide, and wherein the chlorine dioxide is produced as a result of chemical reaction of at least a portion of the second bed with at least one of said at least one proton generating impregnating agent and protons resulting from activation of said at least one proton generating impregnating agent.

A method for filtering a fluid containing a contaminant, including the steps of:

• (a) moving the fluid through a first bed of impregnated zeolite crystals which have been impregnated with one of at least one proton generating impregnating agent and a metal chlorite;
• and
• (b) after step (a), moving the fluid through a second bed of impregnated zeolite crystals which have been impregnated with another one of at least one proton generating impregnating agent and a metal chlorite, wherein chloride dioxide is produced as a result of the chemical reaction of said at least one proton generating impregnating agent;
• wherein the first bed of impregnated zeolite crystals have been impregnated with said metal chlorite and at least one proton generating impregnating agent selected from the group consisting of calcium chloride, magnesium sulfate, potassium chloride, and potassium hydroxide, and the second bed of impregnated zeolite crystals have been impregnated with said at least one proton generating impregnating agent, and wherein the chlorine dioxide is produced as a result of chemical reaction of at least one substance released from the first bed with at least one of said at least one proton generating impregnating agent and protons resulting from activation of said at least one proton generating impregnating agent.