7631-90-5 Usage
Chemical Description
Sodium bisulfite is a chemical compound used as a reducing agent.
Chemical Description
Sodium bisulfite is a chemical compound with the formula NaHSO3.
Description
Sodium bisulfite, also known as sodium acid sulfite or sodium hydrogen sulfite (NaHSO3), is a white crystalline solid or powder with a slight sulfurous odor and taste. It is soluble in water, slightly soluble in alcohol, unstable in air, and non-combustible. Sodium bisulfite is derived by saturating a sodium carbonate solution with sulfur dioxide and allowing the solution to crystallize.
Uses
Used in Food Industry:
Sodium bisulfite is used as a reducing agent, food preservative, and bleach. It prevents discoloration, inhibits bacterial growth, and is used in products such as candied fruit, glucose, sugar, rock candy, caramel, candy, liquid glucose, dried fruit, dried vegetables, vermicelli, bamboo shoots, and mushrooms. It is also used in reconstituted lemon juice and has a maximum use of 0.45g/kg in certain food products.
Used in Textile Industry:
Sodium bisulfite is used as a reducing agent in dyes, paper, leather, and chemical synthesis industries. It is also used in the bleaching of cotton fabric and organic substances, as well as a reducing agent in the production of analgin and aminopyrine intermediates in the pharmaceutical industry.
Used in Chemical Synthesis:
Sodium bisulfite is used as a reducing agent, antiseptic, disinfectant, and bleach in various chemical processes. It is also used as a convenient source of sulfur dioxide and serves as a preservative and anti-oxidant.
Used in Analysis and Research:
Sodium bisulfite is used as a reductant in analysis and as a bleach and bacterial inhibitor. It is also used as a pH adjuster in various applications.
Used in Paper-making Industry:
Sodium bisulfite is used in place of sodium hyposulfite to remove chlorine from bleached fibers in the paper-making industry.
Used in Wool Processing:
Sodium bisulfite is used as a reducing agent, disinfectant, and bleach, particularly for wool. It is also used in dyeing for preparing hot and cold indigo vats.
Used in Laundering:
Sodium bisulfite is used as a stripper (reducer) in laundering to remove permanganate stains from skin and clothing.
Used in Pharmaceutical Industry:
Sodium bisulfite is used in the manufacture of sodium hydrosulfite and as a pharmaceutical aid (antioxidant).
Used in Rubber Industry:
Sodium bisulfite is used for coagulating rubber latex and as a preservative for deteriorative liquids or solutions used for technical purposes.
Used in Brewing Industry:
Sodium bisulfite is used for cask sterilization in the brewing industry.
Used in Wood Pulp Digestion:
Sodium bisulfite is used in wood pulp digestion, as well as an analytical reagent and a dietary supplement.
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
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].
Hazard
Not permitted in meats and other sources
of vitamin B
1
, strong irritant to skin and tissue.
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.
Contact allergens
Sodium bisulfite is mainly used as an antioxidant in pharmaceutical products, as a disinfectant or bleach, and in the dye industry. The bisulfite of commerce consists chiefly of metabisulfite and possesses the same properties as the true bisulfite. So, the allergen to be tested in products containing disulfite is the corresponding metabisulfite.
Safety Profile
Poison by intravenous and intraperitoneal routes. Moderately toxic by ingestion. A corrosive irritant to skin, eyes, and mucous membranes. Mutation data reported. An allergen. When heated to decomposition it emits toxic fumes of SO, and Na2O. See also SULFUROUS ACID and SULFITES
Potential Exposure
Sodium bisulfite is used in the digestion of wood pulp, in the tanning of leather; in the dyeing of textiles; as a photographic reducing agent; as a food preservative; as an additive in electroplating; as disinfectant, bleach, antioxidant, and as inhibitor of yeast and bacteria in winemaking.
Shipping
UN2693 Bisulfites, inorganic, aqueous solutions, n.o.s., Hazard class: 8; Labels: 8-Corrosive material. UN3260 Bisulfites, inorganic, solid, n.o.s., Hazard class: 8; Labels: 8-Corrosive material.
Purification Methods
Crystallise it from hot H2O (1mL/g). Dry it at 100o under vacuum for 4hours.
Incompatibilities
Aqueous solution is a weak acid. Incompatible with strong mineral acids forming a toxic sulfur dioxide gas. A strong reducing agent, sodium bisulfite is incompatible with oxidizers, such as perchlorates, peroxides, permanganates, chlorates, and nitrates. Reacts with bases forming sulfate. Slowly oxidizes to sulfate in air. Heat causes decomposition. Slowly oxidized to the sulfate on exposure to air. Contact with oxidizers or acids forms sulfur dioxide gas. Attacks some metals in the presence of moisture.
Waste Disposal
Dump into water, add soda ash, then neutralize with HCl; flush to sewer with large volumes of water.
Check Digit Verification of cas no
The CAS Registry Mumber 7631-90-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,6,3 and 1 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 7631-90:
(6*7)+(5*6)+(4*3)+(3*1)+(2*9)+(1*0)=105
105 % 10 = 5
So 7631-90-5 is a valid CAS Registry Number.
InChI:InChI=1/Na.H2O3S/c;1-4(2)3/h;(H2,1,2,3)/q+1;/p-2
