Sodium metabisulfite is used in the production of sodium hydrosulfite, sulfamethazine, analgin, caprolactam, etc; Used for the purification of chloroform, phenylpropylsulfone, and benzaldehyde. Components used as fixing agents in the photography industry; The spice industry is used to produce vanillin; Used as a preservative in the brewing industry; Rubber coagulants and dechlorinating agents after cotton cloth bleaching; Organic intermediates; Used for printing, dyeing, and tanning; Used as a reducing agent; Used for electroplating, oilfield wastewater treatment, and mineral processing in mines; Used as a preservative, bleach, and relaxant in food processing.

Skin contact: Immediately remove contaminated clothing and rinse with plenty of flowing water for at least 15 minutes. Go see a doctor.

Eye contact: Immediately lift the eyelids and rinse thoroughly with a large amount of flowing water or physiological saline for at least 15 minutes. Go see a doctor.

Inhalation: Leave the site to a place with fresh air. If breathing is difficult, give oxygen. Go see a doctor.

Ingestion: Rinse your mouth with water, drink milk or egg white, and then see a doctor.

Hazard characteristics: Strong reducibility, can react strongly with strong oxidizing agents such as chromic anhydride, chlorate, potassium permanganate, etc., causing combustion or explosion.

Fire extinguishing method: Firefighters must wear full body fire and gas resistant clothing and extinguish the fire upwind. When extinguishing a fire, try to move the container from the fire site to an open area as much as possible.

Leakage emergency response: isolate the contaminated area and restrict entry; It is recommended that emergency personnel wear dust masks (full face masks) and gas protective clothing; Avoid dust, carefully clean, place in a bag, and transfer to a safe place; If there is a large amount of leakage, cover it with plastic cloth and canvas. Collect, recycle, or transport to a waste disposal site for disposal.

Food grade sodium metabisulfite can be used in food processing to improve the taste of food. Its main uses are as follows:

1. Bleach is used to bleach flour used in making cakes and other foods.

2. Expanding agents can make the structure of foods such as bread and biscuits loose and crispy.

3. Adding fungicides to fruit juices, preserves, and canned foods can extend their shelf life and effectively disinfect them.

4. Antioxidants and preservatives have good antioxidant and preservation effects on seafood, fruits, and vegetables.

Sodium metabisulfite is a white or yellow crystalline powder or small crystal with a strong SO2 odor and a specific gravity of 1.4. It is soluble in water, and the aqueous solution is acidic. When in contact with strong acids, SO2 will be released, generating corresponding salts. If left in the air for a long time, it will oxidize to na2s2o6, so the product cannot exist for a long time. Above 150 ℃, SO2 is decomposed