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White or yellow crystalline powder or small crystals, with a strong SO2 odor, the proportion of 1.4, soluble in water, aqueous solution is acidic, and strong acid contact will release SO2 and generate the corresponding salt, long in the air, then oxidized into Na2S2O6, so the product can not be long. Above 1500C, SO2 is separated.
White or yellow crystalline powder or small crystals, with a strong S02 odor, specific gravity 1.4, soluble in water, aqueous solution is acidic, and strong acid contact will release SO2 and generate the corresponding salts, long-term in the air, then oxidized into Na2S206, so the product can not be stored for a long time. Above 1500C, that is, the decomposition of S02.
Use: 1. Sodium bisulfite is used for bleaching of cotton fabrics and organic matter; printing and dyeing industry is used as deoxidizer and bleaching agent for boiling of various cotton fabrics, which can prevent cotton fiber localization and affect fiber strength, and improve the whiteness of boiling materials; 2. Used as a reducing agent in dyes, papermaking, leather making, chemical synthesis and other industries to prevent the oxidation of semi-finished products during the reaction; 3, the pharmaceutical industry sodium bisulfite for the production of metamizole and aminopyrine intermediates; 4. The edible grade product sodium bisulfite is used as bleaching agent, preservative and antioxidant; The water treatment industry is used for the treatment of chromium-containing wastewater and as an electroplating additive.
Use: 1, sodium sulfite for water treatment: used in electroplating wastewater, printing and dyeing wastewater, power plant wastewater and other industrial wastewater, drinking water treatment, and used as a boiler water deoxidizer and dechlorination agent. 2. Sodium sulfite is used in metallurgical mines: it is used in metallurgical industry to reduce gold; it is used as flotation agent and mineral processing agent for non-ferrous metal ores in mining industry. 3, sodium sulfite used in printing and dyeing industry: as a deoxidizer and bleaching agent, used in a variety of cotton fabric cooking, can prevent cotton fiber localization and affect the fiber strength, and improve the whiteness of the cooking. Produces insurance powder, sodium metabisulfite, sodium chlorite, sulfite cellulose ester, sodium thiosulfate, sodium bisulfite, etc. 4. Sodium sulfite is used in the paper industry: it decomposes lignin in wood pulp and is used as a lignin removal agent. 5. Sodium sulfite is used in the pharmaceutical industry: it is an intermediate raw material for the production of analgin and anji pyrine. 6, photographic photosensitive industry: use is used as a film developer. 7, sodium sulfite used in the electronics industry: used in the manufacture of photosensitive resistance. Textile industry: used as a stabilizer for man-made fibers. 9. Sodium sulfite is used in leather industry: it is used as an oxygen barrier for leather.
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