Peroxides and chlorine dioxide (compounds) can be stabilized for long periods of time (years) by combining the compounds with water that has been infused with dioxytetrahydride gas. Such stabilized materials can be used to infuse soft, solid substrates that can be used as sterile wipes, wound dressings, or the like.

A well treatment material for introduction into a subterranean formation is provided. The well treatment material can include a biocide collected onto a sorbent. The biocide can be capable of being desorbed at a generally constant rate over an extended period of time into the subterranean formation. The biocide can be an oxidizing biocide or a non-oxidizing biocide. The sorbent material can include one or more of an absorbent material and an adsorbent material. The biocide can be chlorine dioxide. The sorbent can be one or more of silica gel and graphite.

A system for the integral chlorine dioxide production with relatively independent sodium chlorate electrolytic production and chlorine dioxide production is provided. The system may feed electrolyte solution into a solid-liquid filter, filtering out the crystal and eliminating sodium chloride and sodium dichromate. The sodium chlorate crystal may be fed into a chlorine dioxide generator after dissolving, while sodium chloride and sodium dichromate solution separately return to electrolyzer for electrolysis process. Sodium chloride may be constantly formed as a by-product in the chlorine dioxide production unit, and solution containing the sodium chloride is withdrawn from the generator and, after filtration, washing and dissolution, recycled back to sodium chlorate production unit. This way, there is no need of sodium chloride make-up.

Methods, kits, cartridges, and compounds related to generating chlorine dioxide by exposing ClO.sub.2.sup.− to at least one of an iron porphyrin catalyst or an iron porphyrazine catalyst are described.

The present invention relates to a method of preparing chlorine dioxide (ClO.sub.2) from hydrochloric acid (HCl) and sodium chlorite (NaClO.sub.2) in the presence of water (H.sub.2O). The invention has for its object to further develop the method such that it is more economical to install and operate. The object is achieved when the hydrochloric acid is used in aqueous solution at a concentration of 27 to 33 wt %, the sodium chlorite is used in aqueous solution at a concentration of 22 to 27 wt % and the molar ratio of hydrochloric acid used to sodium chlorite used is between 2.14 and 4.2.

A chlorine dioxide gas generating agent pack includes a chlorine dioxide gas generating agent containing a mixture of chlorite powder, gas generation control agent powder, moisture-absorbent powder, water-absorbent resin powder, and activating agent powder; and a gas-permeable film container permeable to water vapor and chlorine dioxide gas and containing the chlorine dioxide gas generating agent. This chlorine dioxide gas generating agent pack is suitable for being carried to a region where sterilization, disinfection and deodorization are required.

The present invention provides a safe, disposable and biodegradable chlorine dioxide micro generator that uses water soluble paper and hydrogel or compressed cellulose encased in filter paper pouch. The chemicals are kept in a stabilize form until activated by the addition of water. Multiple levels of protection against early exposure to water such as a foil pouch and an impermeable outer container allow for the safe transportation and storage in small, ready for deployment amounts of the chemicals. Water permeated the chemical pack housing and dissolves the paper walls of the chemical pouch housing and then the water facilitates the reaction between the acid and the sodium chlorite to form chlorine dioxide gas as will be described further hereunder. Absorbent and permeable materials packaged around the chemicals provide for the safe containment of the chlorine dioxide solution, and the expeditious aeration and release of the chlorine dioxide gas, once the chemical reaction has been completed.

The aqueous chlorine dioxide solution comprises chlorine dioxide, a potassium salt of a weak acid having a pKa of 2.5 or more, and a chlorite, and has a pH of 4.0 or more and 7.5 or less. The method for producing the aqueous chlorine dioxide solution comprises providing a first aqueous solution containing chlorine dioxide, mixing the first aqueous solution and a second aqueous solution containing a potassium salt of a weak acid having a pKa of 2.5 or more to prepare an intermediate aqueous solution having a pH of 4.0 or more and 7.5 or less, and mixing the intermediate aqueous solution and a third aqueous solution containing a chlorite, or mixing the intermediate aqueous solution and the third aqueous solution and then further adding the second aqueous solution thereto, to prepare an aqueous chlorine dioxide solution having a pH of 4.0 or more and 7.5 or less.

A composition and method for chlorine dioxide production through reaction-diffusion chemistry that facilitates the in situ generation of chlorine dioxide, wherein a dry solid composition of hydroxymethanesulfinic acid monosodium salt dihydrate (abbreviated HMS) and a chlorine dioxide precursor are activated via the addition or absorption of water to produce chlorine dioxide. The dry solid chemical composition comprises dry, safe, transportable reagents that integrate with polymeric materials such as packaging and superabsorbent and stimuli-responsive hydrogel polymers to combine with water to produce chlorine dioxide.

A Venturi pump chlorine dioxide generation device with one or more special ninety-degree bends with half-spherical mixing stations including: at least one ninety-degree bend with two half-spherical mixing stations between the sodium hypochlorite introduction point and the acid source introduction point, at least two ninety-degree bends with two half-spherical mixing stations between the acid source point and the sodium chlorite introduction point, and at least two ninety-degree bends with two half-spherical mixing stations between the sodium chlorite introduction point and the vacuum chamber of the Venturi pump. Each ninety-degree bend with two half-spherical mixing stations is an elbow section of cylindrical conduit or pipe wherein the two outer segments of the ninety-degree bend each have a spherical shaped expansion area to create a half-spherical concave section inside the conduit or pipe.