Sodium metabisulfite is white or yellow crystalline powder or small crystals, with a strong SO2 odor, specific gravity 1.4, soluble in water, the aqueous solution is acidic, and when contacted with strong acid, it will release SO2 and generate corresponding salts. It will oxidize if left in the air for a long time. It becomes Na2S2O6, so the product cannot be stored for a long time. Above 150 degrees Celsius, SO2 is decomposed.

【Basic Information】

Appearance: white or light yellow crystalline powder or small crystals

Product specifications: sulfur dioxide ≥ 65%

Iron ≤ 0.005%

Water insoluble matter ≤ 0.05%

PH value: 4.0-4.6

Chemical Chinese name: sodium metabisulphite

Chemical English name: sodium metabisulfite

Category: Antioxidant.

The main purpose

Chemical industry

Used in the production of sodium sulfoxide, sulfamethazine, caprolactam, etc., as well as the purification of chloroform, phenylpropansulfone and benzaldehyde. The photographic industry is used as a fixative ingredient. The perfume industry is used to produce vanillin. Used as preservative in brewing industry, rubber coagulant and dechlorination agent after bleaching cotton cloth. Organic intermediates, dyes, leather making, as reducing agents, electroplating industry, oil field wastewater treatment, and mine beneficiation agents.

Industry

It is used in printing and dyeing, organic synthesis, printing, tanning, pharmacy and other departments; used as preservative, bleaching agent and bulking agent in food processing.

Used as a chemical reagent

(Printing and dyeing and photography, etc.), used as a bleaching agent, mordant, reducing agent, rubber coagulant, and also used in organic synthetic pharmacy and perfume.

first-aid

Contact: Take off contaminated clothing immediately and rinse with plenty of running water for at least 15 minutes. Seek medical attention.

Eye contact: Lift the eyelid immediately and rinse thoroughly with plenty of running water or saline for at least 15 minutes. Seek medical attention.

Inhalation: Leave the scene to fresh air. If breathing is difficult, give oxygen. Seek medical attention.

Ingestion: Rinse mouth with water, drink milk or egg white, and seek medical attention.

Fire-fighting measures

Hazardous characteristics: It has strong reducibility, and it can react strongly when in contact with strong oxidants such as chromic anhydride, chlorate and potassium permanganate, causing burning or burning.

Hazardous combustion products: sodium oxide (Na2O) and sulfur dioxide (SO2)

Combustion equation: Na2S2O5+O2-Ignition-2SO2+Na2O

Extinguishing methods: Firefighters must wear full-body fire-proof and gas-proof clothing and put out the fire in the upwind direction. When extinguishing a fire, move the container from the fire scene to an open place as much as possible.