The present invention relates to a chlorine dioxide composition having excellent storage stability at room temperature and a method for preparing same and, more specifically, to a chlorine dioxide composition comprising an aqueous chlorine dioxide solution, chlorate, chlorite, a stabilizer containing boron and molybdenum, and a surfactant, and a method for preparing same.

Methods of manufacturing a light-activated powder are provided which provide solid-state generation and release of chlorine dioxide without detectable amounts of any toxic by-products such as chlorine gas, chlorites, or chlorates. The powder need not be exposed to moisture, relative humidity, or an acid before or during exposure of the powder to visible light to generate the gas. The powder can also be prepared under conditions that minimize or prevent decomposition or oxidation of sodium chlorite or premature light activation of the powder during the manufacturing process to maximize its activity.

An article for generating chlorine dioxide includes a canister containing a chlorine-dioxide generating composition. The articles in accordance with the invention are able to generate chlorine-dioxide gas, chlorine-dioxide solution, and chlorine-dioxide solution with surfactants. The canister includes at least one porous region that places an exterior of the canister in fluidic communication with an interior of the canister. The porous region, which in some embodiments, is realized as a mesh, is characterized by a size in a range of about 20 mesh to about 325 mesh.

A chlorine dioxide gas generating device is provided. The device includes a housing, an anode and a cathode, a first reagent and a second reagent, and a hydrophobic membrane. The housing has a cavity. The anode and the cathode are each coupled to and located within the cavity. The first reagent and the second reagent are each located within the cavity. The first reagent and the second reagent are configured to generate chlorine dioxide gas via electrolysis responsive to an electric current being passed into the anode and the cathode. The hydrophobic membrane is coupled to the housing, and is configured to allow the chlorine dioxide gas to exit the housing while preventing fluids from flowing therethrough.

A packed bed catalyst in a pressurized vessel/reactor during contact with a dioxide species precursor enhances catalytic conversion of the precursor to the dioxide species, compared with the same catalytic conversion performed in a non-pressurized vessel/reactor.

A multilayer produce packaging film includes a first layer and a chlorine dioxide-producing layer. The chlorine dioxide-producing layer includes a polymer composition and a plurality of chlorite ions. The chlorine dioxide-producing layer is substantially free of an energy-activated catalyst and is substantially free of an acid-releasing compound. However, the film is capable of generating chlorine dioxide when exposed to UV light and moisture.

The present disclosure generally relates to methods of treating process water using a reactor for generating chlorine dioxide onsite. The onsite generation system may include double ensured precursor feeding, effective reactor, automated control/alarm, and effective product delivery. The reactor may include a mixing device, a first feed line connected to the mixing device, and a second feed line connected to the mixing device. The reactor may include a proximal portion in fluid communication with the mixing device and a distal portion in fluid communication with a motive water line. The mixing device, the reactor, a portion of the first feed line, and a portion of the second feed line may be positioned within the motive water line.

A method and apparatus use conductivity to control the dosing of various chemical additives used in the water treatment industry by modulating the chemical additives within threshold setpoints. Conductivity directly correlates to concentration of chemical additives. This correlation is used to modulate the dosing rates of chemical additives into a process water stream to consistently regulate and balance chemical additive concentration within the process water stream. For example, the method and apparatus dose chlorine dioxide precursor solutions into a process water stream to generate a consistent concentration of aqueous chlorine dioxide.

The invention relates to the chemical industry and can be used in the production of an aqueous chlorine dioxide solution for disinfection, water purification, sterilization and bleaching. To produce a stabilized aqueous chlorine dioxide solution, in the first step two aqueous solutions, (A) and (B), are prepared. To prepare the first solution (A), metallic or ammonium chloride (A1), metallic or ammonium carbonate (A2) and metallic or ammonium bicarbonate (A3) are dissolved in water. The mass ratio of (B1) to (A2+A3) is (2.4-3.0):1. To prepare the second solution (B), metallic or ammonium persulfate (B1) and metallic or ammonium bisulfate (B2) are dissolved in water. The mass ratio of (B1) to (B2) is 3:1. In the second step, solution (B) is added to solution (A). The invention provides maximum production of the end product (aqueous chlorine dioxide solution) that does not have destabilizing side products and can be stored at a temperature of up to 30° C. and at normal atmospheric pressure for at least 12 months.

An article for generating chlorine dioxide includes a canister containing a chlorine-dioxide generating composition. The articles in accordance with the invention are able to generate chlorine-dioxide gas, chlorine-dioxide solution, and chlorine-dioxide solution with surfactants. The canister includes at least one porous region that places an exterior of the canister in fluidic communication with an interior of the canister. The porous region, which in some embodiments, is realized as a mesh, is characterized by a size in a range of about 20 mesh to about 325 mesh.