Sodium metabisulfite

Sodium metabisulfite is white or yellow crystalline powder or small crystal, with strong SO₂odor, specific gravity 1.4, soluble in water, the aqueous solution is acidic, when contacted with strong acid, SO₂will be released to form corresponding salts. Then it is oxidized to Na₂S₂O₆, so the product cannot survive for a long time.Above 150 degrees Celsius, SO2 is decomposed.

Basic Information

Appearance: white or slightly yellow crystalline powder or small crystals

Product specification:

Sulfur dioxide ≥ 65%

Iron≤0.005%

Water insoluble matter ≤ 0.05%

PH value: 4.0-4.6

Chemical English name: sodium metabisulfite

Category: Antioxidants.

The main purpose

Chemical

For the production of hydrosulfites, sulfamethazine, caprolactam, etc. and purification of chloroform, phenylpropyl sulfone and benzaldehyde.The photographic industry is used as a fixer ingredient.Fragrance industry for the production of vanillin.Used as preservative in brewing industry, rubber coagulant and dechlorination agent after bleaching of cotton.Organic intermediates, dyes, tanning are used as reducing agents for electroplating, wastewater treatment in oil fields and as mineral processing agents in mines, etc.

Industry

It is used in printing and dyeing, organic synthesis, printing, tanning, pharmaceutical and other departments; in food processing, it is used as a preservative, bleaching agent, and loosening agent.

used as chemical reagent

(printing and dyeing and photography, etc.), used as bleaching agent mordant, reducing agent rubber coagulant, also used in organic synthesis of pharmaceuticals and spices.

First-aid

Skin touch: Immediately remove contaminated clothing and rinse with plenty of running water for at least 15 minutes.seek medical attention.

Eye touch: Immediately lift the eyelids and rinse thoroughly with plenty of running water or saline for at least 15 minutes.seek medical attention.

Inhalation: Remove from site 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 can react strongly with strong oxidants such as chromic anhydride, chlorate and potassium permanganate, causing combustion .

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

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

Fire fighting method: Firefighters must wear full-body fireproof and gas-proof clothing and put out the fire in the windward direction.Move containers from the fire to an open area as far as possible when putting out a fire.