Physical properties

Appearance and properties: white, monoclinic crystal or powder.
CAS: 7757-83-7
Melting point (°C): 150 (decomposition by loss of water)
Relative density (water = 1): 2.63
Molecular formula: Na 2 SO 3 (·7H 2 O)
Molecular weight: 126.04 (252.04)
Solubility: Easily soluble Soluble in water (67.8 g/100 ml (heptahydrate, 18 °C), insoluble in ethanol, etc.

Function and Uses

1. Used for the micro-analysis determination of tellurium and niobium and the preparation of developing solution, also used as reducing agent;
2. Used as man-made fiber stabilizer, fabric bleaching agent, photographic developer, dyeing and bleaching deoxidizer, fragrance and dye reducing agent , paper lignin remover, etc.;
3. Used as a common analytical reagent and photoresistor material;
4. Reductive bleaching agent, which has a bleaching effect on food and a strong inhibitory effect on oxidase in plant food. my country stipulates that it can be used for candied fruit, with a maximum dosage of 2.0g/kg; it can also be used for glucose, liquid glucose, table sugar, rock sugar, caramel, candy, bamboo shoots, mushrooms and canned mushrooms, grapes, and black currant juice, with a maximum dosage of 0.60g /kg. Residues of bamboo shoots, mushrooms and canned mushrooms, candied fruit, grapes and black currant juice concentrate (calculated as SO2) ≤ 0.05g/kg; potato starch residues ≤ 0.03g/kg; residues of biscuits, sugar, vermicelli and other varieties The amount of liquid glucose is less than 0.1g/kg; the residual amount of liquid glucose shall not exceed 0.2g/kg;
5. In the printing and dyeing industry, it is used as a deoxidizer and bleaching agent for the scouring of various cotton fabrics, which can prevent local oxidation of cotton fibers and affect fiber strength. , and improve the whiteness of boiled matter. The photosensitive industry is used as a developer. In the organic industry, it is used as a reducing agent in the production of m-phenylenediamine, 2,5-dichloropyrazolone, anthraquinone-1-sulfonic acid, 1-aminoanthraquinone, sodium aminosalicylate, etc., which can prevent semi-finished products in the reaction process Oxidation. In the paper industry, it is used as a lignin removal agent. The textile industry is used as a stabilizer for man-made fibers. The electronics industry is used to make photoresistors. In the water treatment industry, it is used for the treatment of electroplating wastewater and drinking water;
6. In the food industry, it is used as a bleaching agent, preservative, loosening agent, and antioxidant. It is also used in pharmaceutical synthesis and used as a reducing agent in the production of dehydrated vegetables;
7. It is used in the production of sulfite cellulose, sodium thiosulfate, organic chemicals, bleaching fabrics, etc., and is also used as a reducing agent, preservative, dechlorination 8. The
laboratory is used to prepare sulfur dioxide

Industrial sodium sulfite

Sodium Sulfite

Specification

Industrial grade first- class product

Date of production

November 2, 2022

Inspection standards

HG/T 2967-2010

Check Item

standard value

Measured value

Sodium sulfate% (Na 2 SO 3 )

≥96.00

96.13

Iron % (Fe)

≤0.005

0.003

Water insoluble matter%

≤0.03

0.02

Free alkali %(Na 2 CO 3 )

≤0.10

0.07

Chloride%(NaCl)

≤0.10

0.03

Appearance

White powder

White powder