What are the characteristics of chemical products sodium metabisulfite

Sodium metabisulfite is white or yellow crystalline powder or small crystal, with strong SO2 smell, specific gravity 1.4, soluble in water, aqueous solution is acidic, SO2 is released upon contact with strong acid to generate corresponding salts, and if left in the air for a long time, it will oxidize Into Na2S2O6, so the product cannot last for long. Above 150 degrees Celsius, SO2 is decomposed.

Main uses: chemical industry, pharmaceutical industry

Used in the production of insurance powder, sulfamethazine, analgin, caprolactam, etc., as well as the purification of chloroform, phenylpropyl sulfone and benzaldehyde. It is used as a fixer ingredient in the photographic industry. The perfume industry is used to produce vanillin. Used as preservative in brewing industry, rubber coagulant and dechlorinating agent after cotton bleaching. Organic intermediates, dyes, and leather are used as reducing agents. Used as electroplating industry, oil field wastewater treatment, and as a mineral processing agent in mines.

It is used in industries such as printing and dyeing, organic synthesis, printing, tanning, and pharmaceuticals; as a preservative, bleaching agent, and bulking agent in food processing. Used as chemical reagent (printing, dyeing, photography, etc.), as bleaching agent, mordant, reducing agent, rubber coagulant, also used in organic synthetic pharmaceuticals and perfumes.

effect

Use 1: Used as bleaching agent, mordant, reducing agent, rubber coagulant, also used in organic synthesis, pharmacy and perfume, etc. Use 2: Used as chromatographic analysis reagent, preservative and reducing agent, used in dye and pharmaceutical industry

Uses Sodium metabisulfite biasulfate has a stronger reduction, and its effect is similar to sodium sulfite. my country's regulations can be used for candied fruit, biscuits, sugar, rock sugar, caramel, candy, glucose, liquid glucose, bamboo shoots, mushrooms and canned mushrooms, the amount of use is 0.45g/kg. The residual amount of candied fruit, bamboo shoots, mushrooms and canned mushrooms, grapes and black currant juice (as SO2) is less than 0.05/kg; the residual amount of biscuits, sugar, vermicelli and other varieties is less than 0.1g/kg; the residual amount of liquid glucose Must not exceed 0.2g/kg.

Use three: The food industry is used as bleaching agent, preservative, loosening agent, antioxidant, color-protecting agent and preservative.

Use four: The pharmaceutical industry is used to produce chloroform, phenylpropyl sulfone, and benzaldehyde. Used as coagulant in the rubber industry. Used in printing and dyeing industry as a dechlorinating agent for cotton cloth bleaching and as an auxiliary for cotton cloth cooking The leather industry is used for leather treatment, which can make the leather soft, full and tough, and has the properties of waterproof, folding resistance and wear resistance. Used in the chemical industry to produce hydroxyvanillin, hydroxylamine hydrochloride, etc. Used as a developer in the photosensitive industry.

Use five: Analysis, preservative, reducing agent, antioxidant.