anhydrous sodium sulfite
Sodium sulfite
CAS: 7757-83-7
Molecular Formula: Na2O3S
anhydrous sodium sulfite - Names and Identifiers
| Name | Sodium sulfite |
| Synonyms | natriumsulfid natriumsulfit natriisulphis Sodium sulfite Sodium sulphite disodiumsulfite natriumsulfurosum anhydroussodiumsulfite exsiccatedsodiumsulfite Sodium sulfite anhydrous anhydrous sodium sulfite Sodium sulfite ,anhydrous |
| CAS | 7757-83-7 |
| EINECS | 231-821-4 |
| InChI | InChI=1/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2 |
anhydrous sodium sulfite - Physico-chemical Properties
| Molecular Formula | Na2O3S |
| Molar Mass | 126.04 |
| Density | 2.63 |
| Melting Point | 500 °C |
| Water Solubility | 23 g/100 mL (20 ºC) |
| Solubility | H2O: 1M at20°C, clear, colorless |
| Appearance | Solid |
| Specific Gravity | 2.633 |
| Color | White to slightly yellow |
| Odor | Odorless |
| Merck | 14,8682 |
| PH | 9.0-10.5 (25℃, 1M in H2O) |
| Storage Condition | Store at +5°C to +30°C. |
| Stability | Stable. Incompatible with strong acids. Moisture and air sensitive. |
| Sensitive | Hygroscopic |
| Refractive Index | 1,484 |
| Physical and Chemical Properties | Character: colorless monoclinic crystal. The relative density of 1.561 soluble in water, its aqueous solution was alkaline reaction; Insoluble in ethanol. |
| Use | For artificial fiber stabilizer, fabric bleaching agent, photographic developer, dyeing and deoxidizing agent, perfume and dye reducing agent, paper lignin removal agent |
anhydrous sodium sulfite - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R31 - Contact with acids liberates toxic gas R36/37/38 - Irritating to eyes, respiratory system and skin. R22 - Harmful if swallowed R40 - Limited evidence of a carcinogenic effect R36/38 - Irritating to eyes and skin. |
| Safety Description | S24/25 - Avoid contact with skin and eyes. S36 - Wear suitable protective clothing. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S22 - Do not breathe dust. |
| WGK Germany | 1 |
| RTECS | WE2150000 |
| FLUKA BRAND F CODES | 3-10 |
| TSCA | Yes |
| HS Code | 28321000 |
| Toxicity | LD50 i.v. in mice: 175 mg/kg, Hoppe, Goble, J. Pharmacol. Exp. Ther. 101, 101 (1951) |
anhydrous sodium sulfite - Upstream Downstream Industry
anhydrous sodium sulfite - Nature
Open Data Verified Data
colorless monoclinic crystals. Soluble in water, its aqueous solution is alkaline reaction. Insoluble in ethanol. In air stroke and oxidation to sodium sulfate.
Last Update：2024-01-02 23:10:35
anhydrous sodium sulfite - Preparation Method
Open Data Verified Data
sulfur dioxide is introduced from the bottom of the absorption column to react with the soda ash solution to form a sulfurous acid solution. Slowly add soda ash solution to neutralize to slightly acidic, and then add soda ash solution to make pH 11~12, after decolorization, filtration, clear liquid after evaporation crystallization, centrifugal dehydration, 250~300 deg C air drying, anhydrous sodium sulfite product.
Last Update：2022-01-01 08:53:26
anhydrous sodium sulfite - Standard
Authoritative Data Verified Data
This product containing Na2S03 should be 97.0% ~ 100.
Last Update：2024-01-02 23:10:35
anhydrous sodium sulfite - Trait
Authoritative Data Verified Data
- This product is white crystal or powder.
- This product is soluble in water, very slightly soluble in ethanol, almost insoluble in ether.
Last Update：2022-01-01 11:20:34
anhydrous sodium sulfite - Use
Open Data Verified Data
In the field of water treatment, sodium sulfite is used as a deoxidizing agent for boiler water and oil field water injection, and a dechlorination agent for municipal water or industrial water. In wastewater treatment, it is used to reduce hexavalent chromium salt to low toxic trivalent chromium salt, and can precipitate and separate silver and mercury from wastewater. At present, sulfurous acid is widely used in small and medium-sized boilers and boilers operating under a pressure of less than 5. 88MPa, usually with 2%~ 10% solution. The amount of sodium sulfite used is usually 0.076g/L. When used, it is preferable to add an appropriate amount of a catalyst, such as salts of Cu, Co, Mn and Ni, so as to improve the oxygen removal rate. When the boiler is stopped, it can be filled with alkaline deoxygenated water which has been deoxygenated and added with about 200mg/L sodium sulfite to protect the metal from corrosion. When removing excess free chlorine from water, sodium sulfite should be used in combination with sodium bisulfite or sulfur dioxide. In addition, as the deoxidizing agent for oil production and water injection in the oil field, the corrosion of dissolved oxygen to the well pipe can be controlled by adding 10 mg/L of sodium sulfite. In addition, sodium sulfite is used as a raw material for the production of sodium thiosulfate in chemical production, and is also a stabilizer for viscose fiber, a bactericide for beer bottles, a engraving agent for glass mirrors and stone plates, a fabric bleaching component and a deoxidizing agent, developer for photographic industry, etc.
Last Update：2022-01-01 08:53:26
anhydrous sodium sulfite - Differential diagnosis
Authoritative Data Verified Data
- the aqueous solution of this product (1 - 10) is alkaline, and the solution is the identification reaction of sulfite (General rule 0301).
- identification of sodium salt in aqueous solution of this product (1) reaction (General rule 0301).
Last Update：2022-01-01 11:20:35
anhydrous sodium sulfite - Safety
Open Data Verified Data
toxic l its dust and solution have a irritating effect on the skin, eyes and mucous membranes. The minimum lethal dose in humans is 500mg/kg. Oral LDso in rats was lOOOmg/kg; Intravenous LDso was 115mg/kg; And intravenous LDso was 130mg/kg in rats. After the human consumption, due to the release of sulfuric acid has a stimulating effect on the stomach, high doses can cause severe pain and Diarrhea, and lead to circulatory system and nervous system disorders. Immediately after contact with the skin and eyes, wash with plenty of water. The operator should wear the specified protective gear. Ventilation should be provided in the work area. Do not mix with oxidant and strong acid. To prevent sun, rain and moisture. When storing sodium sulfite solution, it should be strictly sealed, isolated from air or add a stabilizer to the solution.
Last Update：2022-01-01 08:53:27
anhydrous sodium sulfite - Exam
Authoritative Data Verified Data
clarity and color of solution
take this product l.O g, add water 20ml to dissolve, check according to law (General rule 0901 and general rule 0902), the solution should be clear and colorless.
thiosulfate
take 2.0g of this product, add 100ml of water, shake to dissolve, add 10ml of formaldehyde solution, 10ml of acetic acid, shake, stand for 5 minutes, take 100ml of water, from "add formaldehyde solution", the same method was used as blank. Add 0.5ml of starch indicator solution, titrate with Iodine titration solution (O.OSmol/L), subtract the volume consumed in the blank test, and consume 0.15ml of Iodine titration solution.
iron drum
take this product l.O g, add 2ml hydrochloric acid, dry on water bath, add appropriate amount of water to dissolve, check according to law (General rule 0807), and standard iron solution 1. Compared with the control solution made of 0M l, it should not be deeper (0.001%).
zinc
take about lO.Og of this product, weigh it accurately, put it in 250ml Erlenmeyer flask, add 25ml water, shake to dissolve most of it, slowly add 15ml hydrochloric acid, and heat it to boiling. Cool, transfer to a 100ml measuring flask quantitatively with water, dilute to the scale, shake well, take an appropriate amount accurately, and dilute quantitatively with water to make a solution containing about 20mg per lm l, as a test solution; Accurately measure the zinc single element standard solution (containing Zn 100(Vg)5ml per lm l), put it in a 200ml measuring flask, dilute it to the scale with water, shake it well, take 2ml precision, 100ml flask, add hydrochloric acid 3ml, diluted with water to the scale, shake, as a reference solution. Respectively take the sample solution and the reference solution, according to Atomic Absorption Spectrophotometry (General rule 0406 first method), at the wavelength of 213.9nm, the absorbance of the test solution shall not be greater than that of the reference solution (0.0025%).
Heavy metals
take this product l.O g, inspection according to law (General Principles 0821 The first law), containing heavy metals shall not exceed 10 parts per million.
selenium
take 3.0g of this product, Add 10ml of formaldehyde solution, slowly add hydrochloric acid 2 m l, water bath heating for 20 minutes, the solution shows pink. l.O g, precision plus selenium standard solution (precision weighing to take the micro 0. 100g, 2ml of nitric acid was added, evaporated to dryness, 2ml of residual water was added to dissolve, evaporated to dryness, and the operation was repeated for 3 times. The residue was dissolved with dilute hydrochloric acid and quantitatively transferred to a 1000ml measuring flask, diluted with dilute hydrochloric acid to the scale, shake well, then get) 0.2M l, Add 10ml of formaldehyde solution, slowly add 2ml of hydrochloric acid, water bath heating for 20 minutes, the color of the prepared control solution comparison, not deeper (0. 001%).
arsenic salt
take this product 0. 5G, add 0822 of water to dissolve, add 1ml of sulfuric acid, put it in a sand bath and steam it until white smoke comes out, let it cool, add of water and 5ml of hydrochloric acid, and check it according to law (General rule law), the provisions (0.0004%) shall be met.
Last Update：2022-01-01 11:20:36
anhydrous sodium sulfite - Content determination
Authoritative Data Verified Data
take this product about 0.20g, precision weighing, plus the appropriate amount of water shake dissolved, precision Iodine titration solution (0. 05mol/L)50ml, dense, placed in the dark for 5 minutes, with sodium thiosulfate titration solution (0. lm o l/L) titration, near the end point, add starch indicator liquid lm l, continue titration until the blue disappeared, and the titration results are corrected by blank test. Each l of iodine titrant (0.05mol/L) corresponds to 6. 302mg of Na2S03.
Last Update：2022-01-01 11:20:36
anhydrous sodium sulfite - Category
Authoritative Data Verified Data
pharmaceutical excipients, antioxidants.
Last Update：2022-01-01 11:20:36
anhydrous sodium sulfite - Storage
Authoritative Data Verified Data
sealed storage.
Last Update：2022-01-01 11:20:36
anhydrous sodium sulfite - Reference Information
| pH range of acid-base indicator discoloration | 9.0 - 10.5 at 126g/l at 25°C |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Overview | sodium sulfite is an inorganic compound. It is a white granular powder at room temperature, has a sulfur dioxide odor, is stable when dry, and is sensitive to moisture. Soluble in water and glycerol, insoluble in ethanol, the aqueous solution is alkaline, the aqueous solution of litmus test paper and phenolphthalein is alkaline, and acid to produce toxic sulfur dioxide gas, the pH value of 1% aqueous solution is 8.3~9.4, which has strong reducibility. It is decomposed into sodium sulfide and sodium sulfate when heated, and gradually oxidized into sodium sulfate when placed in air. In nature, there are three forms of anhydrous sodium sulfite, sodium sulfite heptahydrate and sodium sulfite decahydrate, among which anhydrous sodium sulfite is hardly oxidized. |
| Application | anhydrous sodium sulfite can be used as a developer, preparation of cellulose Sulfite ester, preparation of sodium thiosulfate, preservative of dried fruit and meat, deoxidizing agents in the printing and dyeing industry, as well as chemical reagents used as reducing agents, are used in chemical and laboratory production and synthesis. |
| preparation | sodium sulfite can be prepared by introducing sulfur dioxide into sodium hydroxide solution, and when sulfur dioxide is excessive, sodium bisulfite is generated. Or to the sodium carbonate solution into sulfur dioxide gas, saturated after the addition of sodium carbonate solution, the crystallization of seven water crystallization, heating dehydration is anhydrous sodium sulfite. |
| identification test | is the same as 3 in "sodium metabisulfite (09011). |
| content analysis | weigh sample 0.25g accurately and quickly by the method of weight reduction, add 50ml of 0.1mol/L iodine solution and 50ml of water to the flask, mix and let stand for 5min, add 1ml of hydrochloric acid and mix well, when titrated to light yellow with 0.1mol/L sodium thiosulfate solution, about 3ml of the starch test solution (TS-235) was added, and titration was continued until colorless. |
| toxicity | ADI O ~ 0.7mg/kg(SO2, total ADI value of SO2 and sulfite; FAO/WHO,2001). LD50 600 ~ 700mg/kg (rabbit, oral). GRAS(FDA,§ 182.3798,2000). LD50 (intravenous injection in mice):175 mg/kg (calculated as SO2). After 1~2 years test of rats, the content of feed is 3.07 × 10-4 (in S0) and the following does not show toxic effect, but the content is added to 6.15 × 10-4 (in SO2) when symptoms such as polyneuritis and bone marrow atrophy, growth inhibition. |
| usage limit | GB 2760-2001(g/kg): glucose, sugar, ice sugar, sugar, candy, liquid glucose, canned bamboo shoots, mushrooms and mushrooms, grapes, blackcurrant juice concentrate, 0.60; Preserved fruit, 2.0; Fruit drink concentrate 0.25 (based on sodium sulfite), diluted 10 times 15mg/L (S0:). FAO/WHO(1984,mg/kg): quick-frozen shrimp, shrimp, lobster raw products 100, cooked products 30, quick-frozen French fried potatoes 50 (SO2); pineapple juice concentrate with preservatives 500 (only for |
| Use | for artificial fiber stabilizer, fabric bleaching agent, photographic developer, dye bleaching deoxidizer, perfume and dye reducing agent, reductive bleaching agents, such as papermaking lignin scavengers, have a bleaching effect on food and a strong inhibitory effect on oxidase in plant food. China can be used for preserved fruit, the maximum use of 2.0g/kg; Can also be used for glucose, liquid glucose, sugar, ice sugar, sugar, candy, bamboo shoots, mushrooms and mushrooms canned, grapes, black currant juice concentrate, the maximum use of 0.60g/kg. The residual amount of concentrated juice of bamboo shoots, mushrooms and canned mushrooms, preserved fruits, grapes and blackcurrant (calculated as SO2) is less than or equal to 0.05g/kg; The residual amount of potato starch is less than or equal to 0.03g/kg; Biscuits, sugar, the residual amount of fans and other varieties is less than 0.1g/kg; The residual amount of liquid glucose should not exceed 0.2g/kg. used as general analysis reagent and photoresistor material used for trace analysis and determination of tellurium and niobium and preparation of developer, also used as reducing agent used in printing and dyeing industry as deoxidizer and bleaching agent, for a variety of cotton fabric cooking, can prevent local oxidation of cotton fiber and affect the fiber strength, and improve the whiteness of cooking. The photosensitive industry is used as a developer. The organic industry is used as a reducing agent for the production of M-phenylenediamine, 2, 5-dichloropyrazolone, anthraquinone -1-sulfonic acid, 1-aminoanthraquinone, sodium aminosalicylate, etc., which can prevent the oxidation of semi-finished products in the reaction process. The paper industry is used as a lignin scavenger. The textile industry is used as a stabilizer for man-made fibers. The electronics industry is used for the fabrication of photoresistors. The water treatment industry is used for the treatment of electroplating wastewater and drinking water. It is used as bleaching agent, preservative, coagulant and antioxidant in food industry. It is also used in pharmaceutical synthesis. Used as a reducing agent in the production of dehydrated vegetables. It is used in the preparation of cellulose sulfite, sodium thiosulfate, organic chemicals, bleached fabrics, etc., and also used as a reducing agent, preservative, chlorine removal agent, etc. |
| production method | the absorption method uses food-grade soda ash solution to absorb sulfur dioxide, saturates it and then adds refined sodium hydroxide solution, crystalline sodium sulfite was prepared by crystallization, and then heated and dehydrated to obtain edible anhydrous sodium sulfite. The gas containing sulfur dioxide obtained by sulfur combustion is passed through the bottom of the absorption tower by the absorption method of soda ash solution, and is countercurrent absorbed with the soda ash solution to generate sodium bisulfite solution and sent to the neutralization tank, the neutralization reaction was carried out by slowly adding the soda ash solution to be slightly acidic. Then the caustic soda solution is added to make the pH value of the solution reach 11~12, and the solution is decolorized, filtered, clarified and crystallized by evaporation, centrifuged and dried at 250~300 ℃, A finished product of anhydrous sodium sulfite was prepared. Its S O2 → SO2; na2CO3 SO2 → Na2SO3 C02 ↑ Na2SO3 SO2 H2O → 2NaHSO3NaHSO3 NaOH → Na2SP3 H2O The Soz-containing gas generated by combustion of sulfur is passed into the absorption tower with a relative density of 1.21(25 ° Bere). The sodium bisulfite solution is countercurrent absorbed, and the pH value of the generated sodium bisulfite solution reaches 5~6. The sodium bisulfite solution with a relative density of 1.21 is neutralized to slightly acidic in a neutralization tank, and then heated to above 102 ℃; then add the relative density of 1.19 caustic soda solution and neutralized to pH 11~12, remove iron, while obtaining sodium sulfite solution; Neutralization liquid by vacuum (26.7kPa) evaporation concentration, crystallization separation, 250~300 deg C air drying to remove the water of crystallization products. Na2CO3 SO2 H2O→NaHSO3[NaOH]→Na2CO3 |
| category | toxic substances |
| toxicity grade | poisoning |
| Acute toxicity | oral-rat LD50 3560 mg/kg; Oral-mouse LD50: 820 mg/kg |
| flammability hazard characteristics | non-combustible; toxic oxides of sodium and sulfur |
| storage and transportation characteristics | warehouse low temperature, ventilation, dry |
| extinguishing agent | water, carbon dioxide, dry powder, sand |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 20:48:19
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Raw Materials for anhydrous sodium sulfite
Downstream Products for anhydrous sodium sulfite