Purpose:

醫藥工業用于生產氯仿、苯丙砜和苯甲醛；橡膠工業用作凝固劑；印染工業用作棉布漂白后的脫氯劑，棉布煮煉助劑；制革工業用于皮革處理，能使皮革柔軟、豐滿、堅韌，具有防水、抗折、耐磨等性能；化學工業用于生產羥基香草醛、鹽酸羥胺等；感光工業用作顯影劑等；食品工業用于漂白劑、防腐劑、疏松劑、抗氧劑、護色劑、保鮮劑。

The pharmaceutical industry is used to produce chloroform, phenylpropanesulfone and benzaldehyde; Rubber industry used as coagulant; The printing and dyeing industry is used as dechlorination agent after bleaching of cotton cloth and cotton scouring agent; Leather industry is used for leather processing, which can make leather soft, plump, tough, waterproof, folding resistant, wear-resistant and so on; Chemical industry is used to produce hydroxyvanillin, hydroxylamine hydrochloride, etc; Photosensitive industry used as developer, etc; In the food industry, it is used as bleach, preservative, loosening agent, antioxidant, color protector and preservative.

物理性質：

physical property:

白色或微黃色結晶粉末。相對密度1.4，溶于水（20℃時為54g/100ml水；100℃時為81.7g/100ml水）水溶液呈酸性，溶于甘油，微溶于乙醇。受潮易分解，露置空氣中易氧化成硫酸鈉，與強酸接觸放出二氧化硫而生成相應的鹽類，加熱到150℃分解。

White or yellowish crystalline powder. The relative density is 1.4, soluble in water (54g/100ml water at 20 ℃; 81.7g/100ml water at 100 ℃) the aqueous solution is acidic, soluble in glycerol and slightly soluble in ethanol. It is easy to decompose when exposed to moisture, and it is easy to oxidize into sodium sulfate in the exposed air. When contacting with strong acid, sulfur dioxide is released to generate corresponding salts, which are heated to 150 ℃ for decomposition.

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