7631-90-5

Raw materials And Preparation Products

Hazard Information

Material Safety Data Sheet(MSDS)

Questions And Answer

• Chemical properties

  white monoclinic crystal; sulfur dioxide odor; soluble in water, slightly soluble in alcohol.;

• Uses

  1. Used as reducing agent, food preservatives and bleach.
  2. Used for the bleaching of cotton fabric and organic substance. Used as reducing agents in dyes, paper, leather, chemical synthesis and other industries. Used for the production of analgin and aminopyrine intermediates in pharmaceutical industry. Used as bleach, preservatives, and antioxidants of food grade products.
  3. Sodium bisulfite is reduction bleach allowed to use in China. It has bleaching effect on food and has a strong inhibitory effect on the oxidase within plant foods. It can be used for candied fruit, glucose, sugar, rock candy, caramel, candy, liquid glucose, dried fruit, dried vegetables, vermicelli, bamboo shoots, mushrooms and mushroom cans in provisions of our country, with a maximum use of 0.45g/kg; it can also be used for potato starch with a maximum use amount of 0.2g/kg and a maximume residual amount (in terms of SO2) of less than 0.03 g/kg.
  4. Used as reductants in analysis and also as bleach and bacterial inhibitors
  5. Used as reducing agent, antiseptic, disinfectant and bleach.;

• Identification test

  Both sodium salt test (IT-28) and sulfite test (IT-30) are positive.;

• Content Analysis

  Transfer 50ml of 0.1mol/L iodine solution into a flask with a stopper, and then add 200mg of accurately weighed sample and plug. After placed 5min, add 1ml of hydrochloric acid, and plus starch test solution (TS-235) as an indicator. Titrate the excess iodine with 0.1 mol/L sodium thiosulfate. Each mI of 0.1mol/L iodine solution is equivalent to 3.203mg of sulfur dioxide (SO2).;

• Toxicity

  ADI 0~0.7mg/kg (in SO2; including SO2 and sulfites; FAO/WHO, 2001).
  LD50 115 mg/k (rat, oral).
  GRAS (FDA, § 182.3739, 2000).;

• Usage limits

  GB 2760-2001 (g/kg): candied fruit, dried fruits, dried vegetables, vermicelli, glucose, sugar, rock candy, caramel, candy, liquid glucose and cans of bamboo shoots, mushrooms and mushrooms 0.45; potato starch 0.20 (Residue≤0.03); fresh glucose (tablet gasification process, in sulfite) 2.4 (residual amount calculated in SO2≤0.05, tablet packaging shall give clear indication of indicate edible)
  FAO/WHO(1984): frozen shrimp, prawns, lobsters (raw product) 100mg/kg, (cooked products) 30mg/kg(in SO2); frozen french fried potatoes 50mg/kg (in SO2); pineapple juice with anti-corrosion 500 mg/kg of (in SO2; only for manufacture).
  Maximum residue levels (in SO2) of Japanese provisions: dried apricots, dried peaches 2g/kg; gelatin 0.5g/kg; molasses, corn syrup 0.3g/kg; fruit wine 0.35g/kg; shrimp 0.1mg/kg.
  When applied to dry fruit, sodium bisulfite can be prepared into 0.2% to 3% solution to take dipping or spraying.
  FDA, § 182.3739 (2000): shall not be used for meat, vitamin B and source food.
  EEC (1990): mainly for the preservation of alcoholic beverages.;

• Production method

  Add sodium sulphite mother liquor (containing NaHSO3 40%, Ph value of 3 to 4) slowly into soda ash to generate sodium sulfite solution (to the slurry Ph value of 7~8 for the end); transfer the above sodium sulfite solution into series reactors (2 to 3) to absorb the SO2 gas (10% to 13%) from the combustion of sulfur, forming sodium bisulfite (to the reaction temperature no longer rising for the end). In the reaction process, a large number of crystals precipitate out, which is centrifuged to obtain the wet goods with moisture content of 6% to 10%, and then dehydrated by air drying at 250 to 300 ° C to make the final products.
  2NaHSO3 + Na2CO3 → 2Na2SO3 + H2O + CO2↑
  NaSO3+H2O→2NaHSO3
  Absorb sulfur dioxide from the gas of sulfuric acid production with soda ash solution to generate sodium bisulfite. After further centrifugal separation and air drying at 250~300 ° C, the final sodium bisulfite is obtained.
  Na2CO3 + 2SO2 + H2O → 2NaHSO3 + CO2↑;

• Hazards & Safety Information

  Category： Corrosive items
  Toxicity classification： moderate toxicity
  Acute Toxicity： Oral-Rat LD50: 2000 mg/kg; Abdominal-Mouse LD50: 675 mg/kg
  Flammable hazardous characteristics ：
  The products can decompose into sulfur oxides when meeting heat;
  Aqueous solution is alkaline and corrosive.
  Storage and transportation characteristics ：
  Storehouse should be low-temperature, well-ventilated and dry.
  Fire extinguishing agent： much water
  Occupational Standard： TWA 5mg /m3; TWA 5 mg/m3;

Spectrum Detail

Well-known Reagent Company Product Information

Supplier

Related Products