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[Chemical Knowledge]：Properties and Uses of Sodium Dithionite

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Sodium dithionite, also known as sodium hydrosulfite, is an important chemical raw material, widely used in textile, paper, food, pharmaceutical and other industries. This article will detail the nature and use of sodium dithionite.

1. The properties of sodium dithionite

1. Physical properties: Sodium dithionite is a white crystalline powder with strong reducibility and hygroscopicity. It is easily soluble in water and insoluble in ethanol and ether.
2. Chemical properties: Sodium dithionite is stable in neutral or alkaline solutions, but it will decompose in acidic solutions to produce gases such as sulfur dioxide and hydrogen sulfide. It has strong reducibility and can react with many oxidants.

2. the use of sodium dithionite

1. Textile industry: In the textile industry, sodium dithionite is mainly used as a bleaching agent. It can be used for bleaching of cotton, linen, silk, wool and other fabrics to improve the whiteness and color of the fabric. In addition, it can also be used for reduction dyeing in the dyeing process to improve the color fastness and brilliance of the dye.
2. Paper industry: In the paper industry, sodium dithionite can be used as a bleaching agent for pulp to increase the whiteness of pulp and improve the quality of paper. At the same time, it can also be used as an internal sizing agent to increase the water resistance of paper.
3. Food industry: In the food industry, sodium dithionite is commonly used as a food additive, with anti-corrosion, anti-oxidation and bleaching effects. It can be used for the preservation of fruits and vegetables and extend the shelf life of food.
4. Pharmaceutical industry: In the pharmaceutical industry, sodium dithionite can be used as raw materials or excipients of drugs, with detoxification, anti-allergic, anti-inflammatory and other effects. It can be used in the preparation of anti-allergic drugs, antidotes, etc.
5. Other fields: In addition to the above fields, sodium dithionite can also be used for developer in the photographic industry, metal surface treatment, etc.

In short, sodium dithionite, as an important chemical raw material, is widely used in various fields. It is necessary to pay attention to its nature and safety during use, follow relevant regulations and operating requirements, and ensure the use effect and personnel safety.

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