Sodium Chlorite

Sodium Chlorite:

Liquid sodium chlorite is a white or slightly yellow-green aqueous solution, alkaline and slightly hygroscopic. Soluble in water and alcohol. Sodium chlorite is relatively stable at room temperature and under normal storage conditions, and is easily decomposed to release chlorine dioxide gas in the presence of acid. It is easy to explode or burn when it is in contact with, impacted or rubbed with sawdust, organic matter and reducing substances, and it is toxic! The solid sodium chlorite is white crystal or crystalline powder. Slightly hygroscopic. soluble in water. Sodium chlorite generally has two properties: solid and liquid. Liquid sodium chlorite is a dangerous chemical that will explode violently when it encounters acids, acidic substances and reducing substances.


Sodium chlorite is a milder oxidant, which usually does not cause serious damage to fibers, and its impurity removal effect is better than that of sodium hypochlorite and hydrogen peroxide, especially its ability to remove cotton husks is particularly significant. It can be used for bleaching of cotton, synthetic fiber and blended fabrics (not suitable for the bleaching of protein fibers). Currently, it is mostly used for bleaching of polyester-cotton blended fabrics.

Appearance and Shape:

The appearance of solid sodium chlorite is white crystalline powder or granules; liquid sodium chlorite is white or slightly yellow-green aqueous solution, alkaline and slightly hygroscopic. Soluble in water and alcohol.

Content and performance specifications:

Test items 25% sodium chlorite 31% Sodium Chlorite 80% Sodium Chlorite
Appearance shape yellow-green solution yellow-green solution White crystalline powder or granular
Sodium chlorite (NaCLO2) ≥ 25.0 31.0 80.0
Sodium Chlorate (NaCLO3)≤ 0.8 0.6 1.2
Sodium carbonate (Na2CO3)≤ 0.4 0.3 0.8
Sodium sulfate (Na2SO4)≤ 0.1 0.1 0.8
Sodium hydroxide (NaOH)≤ 0.4 0.4 0.6
Sodium chloride (NaCl)≤ 2.0 1.5 15.6
Arsenic (As) 3ppm 3ppm 3ppm

Production Method:

Industrial production has hydrogen peroxide method and electrolysis method.

In the hydrogen peroxide method, the sodium chlorate is first dissolved in water into a solution containing 250g/L of sodium chlorate, then a chlorine dioxide generator is added, and the sulfuric acid is adjusted to 4mol/LH2SO4. The sulfur dioxide and air mixed gas and 4mol/LH2S04 were added to the chlorine dioxide generator for reaction, and the generated chlorine dioxide gas was passed into 3 series-connected bubbling absorption towers, mixed with 27.5% hydrogen peroxide, 18%~20% The liquid caustic soda is reacted, and the resulting solution contains NaClO2140~160g/L. After precipitation, the clear liquid is the liquid sodium chlorite product. It is then concentrated by evaporation to a concentration of sodium chlorite solution of 350-400 g/L, crystallized by cooling, filtered and dried to obtain a finished product of solid sodium chlorite.

Electrolysis method In a three-chamber electrolytic cell separated by a cation exchange membrane, chlorine dioxide gas (with a content of about 15%, and the molar ratio of ClO2:Cl2 not less than 15:1) is passed into the cathode chamber, dissolved in the solution, in the Chlorite is obtained from the cathode at about 30°C, and sodium chloride solution is continuously introduced into the anode chamber, and the chloride ion releases electrons and becomes chlorine gas. Under the action of a DC electric field, sodium ions pass through the anode membrane and enter the cathode chamber to combine with chlorite to form sodium chlorite. The content of the solution is 17% to 23%. After removing the trace amount of chlorine dichloride, the finished product is obtained by spray drying.

Sodium chlorite transportation precautions:

Sodium chlorite belongs to category 5.1 of hazardous chemicals, UN NO:1496. It should not be mixed with acid and reducing substances during transportation; it should be stored in a cool and dry place, away from fire and heat sources, and should not be mixed with acids and reducing substances. In case of fire, water, sand and dry powder fire extinguishers can be used to put out the fire. Sodium chlorite dust is irritating to the respirator tube, eyes and skin. If its solution accidentally splashes on the eyes or skin, it should be rinsed with clean water immediately. After vomiting, he was sent to hospital for treatment, and the lethal dose was 10 grams. The World Health Organization has sorted sodium chlorite into three types of carcinogens. Sodium chlorite has certain toxicity, and the poisoning methods are inhalation, ingestion, and skin absorption. The solution of sodium chlorite and acid will emit strong corrosive and irritating gas, and its solution has a strong stimulating effect on human skin. Sodium chlorite liquid is flammable and explosive, so attention should be paid to transportation and storage. Sodium chlorite is widely used, but should be used with caution.

Sodium Chlorite Uses:

  1. It is used for bleaching of pulp, fiber, flour, starch, oil, etc., drinking water purification and sewage treatment, leather hair removal and preparation of chlorine dioxide aqueous solution, etc.
  2. Used as bleaching agent, decolorizing agent, detoxifying agent, dye discharging agent, etc.
  3. It is used for drinking water purification without residual chlorine odor, and the sewage treatment has the functions of sterilization, phenol removal and deodorization. This product is also a high-efficiency bleaching agent, which is used to bleach fabrics, fibers and pulp, and has the characteristics of less damage to fibers.
  4. It is a high-efficiency bleaching agent and an oxidizing agent. Mainly used for pulp, paper and various fibers, such as cotton, hemp, reed. Bleaching of viscose fibers, etc., can also bleach sugar, flour, starch, grease and wax. It is also used for leather depilation, surface treatment of certain metals, drinking water purification and sewage treatment. It can be used as a dye discharge agent for indanthrene dyeing.
  5. Used as a bleaching agent in the food industry.
  6. It is a new type of high-efficiency bleaching agent and oxidizing bactericide.
  7. Sodium chlorite is an efficient bleaching agent and oxidizing agent. For the bleaching of pulp and various fibers, such as cotton, hemp, mulberry, reed, viscose, etc. It can also bleach sugar, flour, starch Chemicalbook, ointment, wax and grease. It is also used for leather depilation, surface treatment of certain metals, drinking water purification and sewage treatment, etc. It can also be used to purify trace amounts of nitric oxide in coke oven gas.