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Industrial grade sodium metabisulfite
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Sodium metabisulfite, also known as partial sodium sulfite, disulfite, sodium pyrosulfite, etc., is white or yellow crystalline powder or small crystals, with a strong SO2 odor, specific gravity 1.4, soluble in water, and the aqueous solution is acidic. Contact with strong acid will release SO2. Corresponding salts are formed, which will be oxidized to Na2S2O6 if left in the air for a long time, so the product cannot be stored for a long time. Above 150 degrees Celsius, SO2 is decomposed.
Shape is crystalline powder
Molecular formula: Na2S2O5
Granularity: 150 mesh
Customs code: 28321000
Appearance: white or light yellow crystalline powder
PH value: 4-4.8 4.45
Food grade certification: Iso22000, Halal, Kosher
Sodium metabisulfite is divided into industrial grade and food grade.
Commonly used packaging: 25Kg/bag
|Analysis Project||National standard||Laboratory results|
|Main content (calculated as Na2S2O5)%≥||96.5||97.2|
|Iron content (calculated as Fe)%≤||0.003||0.0018|
|Water insoluble matter %≤||0.05||0.02|
|Arsenic (calculated as As) content %≤||0.0001||＜0.0001|
|Heavy metal (calculated by pb)%≤||0.0005||＜0.0005|
Used in the production of sodium hydroxide, sulfamethazine, pyrimidine, 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.
Industrially used in printing and dyeing, organic synthesis, printing, leather making, pharmaceuticals and other sectors; 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 pharmaceuticals and perfumes. It can also be used as a chromatographic analysis reagent, preservative and reducing agent. It is used in dye and pharmaceutical industries. Sodium metabisulfite has stronger reducing properties than sulfate, and its effect is similar to sodium sulfite. my country stipulates that it can be used for candied fruit, biscuits, sugar, rock sugar, caramel, candy, glucose, liquid glucose, bamboo shoots, mushrooms and canned mushrooms. The maximum use amount is 0.45g/kg. The residues of candied fruit, bamboo shoots, mushrooms and canned mushrooms, grapes and blackcurrant concentrated juice (calculated as SO2) are less than 0.05g/kg; the residues of biscuits, sugar, vermicelli and other varieties are less than 0.1g/kg; the residue of liquid glucose The amount shall not exceed 0.2g/kg.
Food industry is used as bleaching agent, preservative, bulking agent, antioxidant, color protectant and preservative.
The pharmaceutical industry is used to produce chloroform, phenylpropansulfone and benzaldehyde. Used as a coagulant in the rubber industry. In the printing and dyeing industry, it is used as a dechlorination agent after bleaching of cotton cloth, and as a scouring aid for cotton cloth. The leather industry is used in leather processing to make the leather soft, plump, tough, waterproof, flexural, and wear-resistant. It is used in the chemical industry to produce hydroxyvanillin, hydroxylamine hydrochloride, etc. The photosensitive industry is used as a developer and so on.
Preparation: The production process of sodium metabisulfite includes dry method and wet method.
(1) Dry method. Stir the soda ash and water at a certain molar ratio evenly. When the Na2CO3.nH2O is formed into a block, put it into the reactor. Keep a certain gap between the blocks and then pass in SO2 until the reaction is over. Take out the blocks. After crushing, the finished product is obtained.
(2) Wet method. Add a certain amount of soda ash to the sodium bisulfite solution to generate a suspension of sodium sulfite, and then pass in SO2 to generate sodium metabisulfite crystals, which are centrifuged and dried to obtain the finished product.
Storage and protection
Should be stored in a cool, dry warehouse. The package should be sealed to prevent air oxidation. Pay attention to moisture. It should be protected from rain and sunlight during transportation. Storage and transportation with acids, oxidants and harmful and toxic substances is strictly prohibited. The storage period should be six months from the date of production. Handle with care when loading and unloading to prevent the package from breaking. In case of fire, water and various fire extinguishers can be used to put out the fire.
①Sodium metabisulfite is used for leather treatment, which can make the leather soft, tough, waterproof, flexural, and wear-resistant.
②Sodium metabisulfite is used in printing and dyeing, and can be used as a deoxidizer after bleaching of cotton cloth and as a scouring aid for cotton cloth.
③Sodium metabisulfite is used as ingredients of photographic fixer, rubber coagulant, chromatographic analysis reagent and used in oilfield wastewater treatment.
① It can be used in the flour for making cakes, steamed bread and other foods, and it can be bleached.
②It can make food such as cotton cloth and biscuits softer and taste better.
③Adding to fruit juice, preserves, canned food can extend its shelf life.
④It has a good antioxidant and fresh-keeping effect on seafood, fruits and vegetables.