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Sodium bisulfite

Chemical properties Uses Identification test Content Analysis Toxicity Usage limits Production method Hazards & Safety Information

CAS No.7631-90-5
Chemical Name:Sodium bisulfite
Synonyms:fr-62;NAHSO3;uantaxsbs;DISULFITE;BISULFITE;PYROSULFITE;Sodium acid;Natriumdisulfit;sodiumsulhydrate;SODIUM DISULFITE
Molecular Formula:HNaO3S
Formula Weight:104.06
MOL File:7631-90-5.mol
Sodium bisulfite Property
Melting point : 150 °C
density : 1.48
storage temp. : Store at RT.
solubility : 300 g/L
Water Solubility : 300 g/L
Merck : 13,8660
Stability:: Stable. Incompatible with strong oxidizing agents, strong acids.
CAS DataBase Reference: 7631-90-5(CAS DataBase Reference)
EPA Substance Registry System: Sulfurous acid, monosodium salt(7631-90-5)
Hazard Codes : Xn
Risk Statements : 22-31-41-52
Safety Statements : 26-39-46-25
RIDADR : UN 2693
WGK Germany : 1
RTECS : UX8225000
Hazardous Substances Data: 7631-90-5(Hazardous Substances Data)

Sodium bisulfite Chemical Properties,Usage,Production

Chemical properties
white monoclinic crystal; sulfur dioxide odor; soluble in water, slightly soluble in alcohol.
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).
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↑

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
Chemical Properties
white powder
General Description
White crystals or crystalline powder. Slight sulfurous odor. Specific gravity 1.48. Strong irritant to skin and tissue.
Air & Water Reactions
Water soluble.
Reactivity Profile
Sodium bisulfite is a reducing agent. Emits highly toxic gaseous sulfur dioxide gas when heated to decomposition or on contact with mineral acids [Sax, 9th ed., 1996, p. 2949].
Health Hazard
Powder is irritating to eyes, nose, and throat and can irritate skin. Ingestion may cause irritation of stomach. Very large doses cause violent colic, diarrhea, depression, and death.
Fire Hazard
Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.
Sodium bisulfite Preparation Products And Raw materials
Raw materials
Sulfur Solvent Sodium sulfite Sulfur dioxide Sodium bicarbonate Sulphur Sodium carbonate
Preparation Products
PHENYLHYDRAZINE DISODIUM SULFONATE DL-Mandelic acid DL-Norephedrine hydrochloride Quinoxaline Iodophor 2,6-Dibromophenol N,N-Diethylcyanoacetamide N,N'-Diphenylbenzidine 4-Acetylbenzoic acid Kanamycin sulfate 3-Bromoindazole 1-Hydroxy-3-phenyl-1,3-propanedisulfonic acid disodium salt 2,4-DINITROBENZENESULFONIC ACID Benz[cd]indol-2(1H)-one 3-AMINOBENZALDEHYDE POLYMER FUBERIDAZOLE 2,3-DIHYDROBENZOFURAN-5-BORONIC ACID N-(1-Naphthyl)ethylenediamine dihydrochloride 4-Iodoaniline 5-Hydroxyquinoline 2-Methoxyphenylacetone 1-CYANOCYCLOPENTENE 4-METHOXY-2-NITROACETANILIDE Fast Blue BB Reactive Blue 104 PIPERITONE 3,3-Dimethylacrylic acid Dichlorosulfophenyl-3-methylpyrazolone 3,3'-Dihydroxybenzidine 2-[(4-Aminophenyl)sulfonyl]ethyl hydrogen sulfate 6-BROMO-3-HYDROXYQUINOLINE Sodium formaldehyde bisulfite Dipyrone 4-Chloromandelic acid Cyclopentyl Acetaldehyde 6-Iodoquinazolin-4-one 2-Methylquinoxaline 5-CHLORO-2-NITROANISOLE 2-BROMO-4-NITROANILINE methylheptenone
Sodium bisulfite Suppliers      Global( 244)Suppliers     
Nanjing Nohon Biological Technology Co., Ltd. 025-85767923 18913972621 sales@nuoxibio.comCHINA 747 55
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JinYan Chemicals(ShangHai) Co.,Ltd. 13817811078,021-5042603086-021-50426522,50426273sales@jingyan-chemical.comCHINA 10101 60
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