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[Chemical Knowledge]：Production and manufacturing method and process flow of anhydrous sodium sulfite

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Anhydrated sodium sulfite is an important raw material for chemical production, which is widely used in printing and dyeing, papermaking, pharmacy, synthetic fiber and other fields. This paper will introduce the manufacturing method of anhydrous sodium sulfite, including raw material preparation, reaction process, post-treatment and so on.

1. Raw Material Preparation

The main raw materials for the manufacture of anhydrous sodium sulfite are caustic soda and sulfur dioxide gas. In the process of raw material preparation, it is necessary to ensure the quality and purity of raw materials to avoid adverse effects on subsequent reactions.

2. reaction process

1. absorption of sulfur dioxide gas

of caustic soda preparation into a certain concentration of lye, through the air containing sulfur dioxide gas, so that the lye absorption of sulfur dioxide gas, generating a mixture of sodium sulfite and sodium bisulfite.

2. Dehydration

Add the mixture to a vacuum jar, heat and vacuum to evaporate water from the mixture to obtain anhydrous sodium sulfite.

3. Post-Treatment

1. Cooling

Remove anhydrous sodium sulfite from the vacuum jar and cool to room temperature.

2. Crushing

Crushing the cooled anhydrous sodium sulfite to obtain a product with a certain particle size.
Precautions for
4.

1. In the manufacturing process, it is necessary to strictly control the reaction temperature and pH value to ensure the smooth progress of the reaction and the quality of the product.

2. During the dehydration process, it is necessary to maintain the stability of the vacuum degree and heating temperature to avoid product agglomeration and dark color.

3. During the post-processing process, it is necessary to pay attention to the storage and transportation of the product to avoid moisture and deterioration of the product.

In short, the manufacture of anhydrous sodium sulfite requires strict control of the process parameters and operating procedures of each link to ensure product quality and output. At the same time, it is necessary to strengthen the maintenance and maintenance of the equipment to ensure the normal operation and service life of the equipment.

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