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Sodium chlorite ( CAS No. 7758-19-2 ) - Haihang Industry

Nov. 07, 2018

Introduction to sodium chlorite

Sodium chlorite is a white crystal or a crystalline powder which is itself toxic and readily soluble in water. Slightly hygroscopic. It has strong oxidizing properties and decomposes at 175 °C to generate heat. When it comes into contact with combustible materials, it will explode and must be safe. Used in bleaching of pulp, paper, various fibers, sugar, flour, starch, grease and wax, drinking water purification and sewage treatment, leather hair removal, dyeing agent for indanthrene dyeing, and preparation of aqueous chlorine dioxide solution.

English alias: Sodium chlorite; Alcide LD; CCRIS 1426; Caswell No. 755; Chlorite sodium; Chlorous acid, sodium salt; EPA Pesticide Chemical Code 020502; HSDB 733; Neo Silox D; Textile; Textone; UNII-G538EBV4VF; Chlorous acid, Sodium chlorite [UN1496] [Oxidizer]; UN1496

Sodium chlorite Typical Properties



Sodium Chlorite




Sodium Chlorate




Sodium Chloride




Sodium Hydroxide




Sodium Carbonate




Sodium Sulfate




Sodium Nitrate








Mercury (Hg)




Lead Pb




Solid state


White or microstrip yellow-green powder or granular crystals, easily soluble in water, and in contact with organic matter can cause an explosion. It is a highly effective oxidizing agent and a premium bleaching agent, equivalent to 2 times bleaching and 7 times bleaching powder. Slightly hygroscopic, stable at room temperature. The anhydrate is heated to 350 ° C and does not decompose. The aqueous sodium chlorite is heated to 130-140 ° C to decompose. Soluble in water (34% at 5 °C; 46% at 30 °C). The alkaline aqueous solution is stable to light, and the acidic aqueous solution is explosively decomposed by the influence of light. The greater the acidity, the faster the decomposition rate, and the release of chlorine dioxide (or oxygen and chlorine) upon decomposition. Strong oxidant, pure theoretical theoretical chlorine content of 157%, and wood chips, organic matter, sulfur, phosphorus, carbon and other combustibles, etc., can cause an explosion when impact friction. Contact with reducing substances can cause violent reactions.


Sodium chlorite is a highly effective oxidizing agent bleach. Mainly used in cotton spinning, linen, pulp bleaching, food disinfection, water treatment, sterilization and algae production and fish medicine manufacturing. The theoretical effective chlorine content of sodium chlorite is 157%, and the industrial chlorine with a purity of 80% or more has an effective chlorine content of 130%, which is equivalent to 7 times that of bleaching powder. Sodium chlorite is mainly used for the bleaching of pulp, paper and various fibers such as linen, ramie, cotton, crepe, viscose and the like. Because of its moderate redox potential, it is used for the bleaching of synthetic fibers (such as washing), natural fibers (such as cotton, hemp, mulberry, pulp and other plant fibers) and rayon (such as rayon). It removes pigment impurities and does not damage the fibers, resulting in a higher quality bleached product that is unmatched by hydrogen peroxide and other chlorine bleaches. With the continuous improvement of people's understanding, especially as the fourth generation disinfectant chlorine dioxide in the medical, food processing, aquaculture, drinking water disinfection, industrial water treatment and drying process, etc., sodium chlorite drinking water Treatment, in addition to sterilization, algae killing, disinfection, there is still deodorization effect. For water contaminated with phenol or phenolic compounds, phenol and phenolic compounds can be removed after treatment. In addition, sodium chlorite can also be used for the bleaching and refining of sugar, flour, starch, grease and wax, as well as the surface treatment of certain metals, the discharge agent for indanthrene dyeing.



Yellow-green liquid, alkaline, is a strong oxidant that releases CIO2 gas when exposed to acid. Generally, the product content is generally between 20% and 30%, stable at room temperature, and the general shelf life can be more than 12 months.


Mainly used for fiber bleaching of cotton, linen, acrylic, polyester, etc. (not suitable for wool, silk, viscose, nylon, etc.) can also be used as food, drinking water disinfection, paper bleaching and fish medicine manufacturing.


Liquid sodium chlorite is classified as a hazardous chemical and is classified as Class 8 UN UN.1908. Strong oxidizing. In case of acid, acid or reducing substances, it is necessary to pay attention to safety.

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