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

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The manufacturing method
of sodium bisulfite
1. Introduction

Sodium bisulfite (NaHSO3) is an important inorganic salt, widely used in chemical, pharmaceutical, food and other fields. It has the characteristics of reduction, corrosion resistance, oxidation resistance, etc., and can be used as food additives, bleaching agents, preservatives, etc. Therefore, it is of great practical significance to study the manufacturing method of sodium bisulfite. This article will introduce a method of preparing sodium bisulfite by chemical reaction with sodium hydroxide and sulfur dioxide as raw materials.

2. raw materials and equipment

1. raw materials: sodium hydroxide (NaOH), sulfur dioxide (SO2)
2. equipment: reactor, stirrer, thermometer, pH meter, condenser, vacuum pump

3. manufacturing method

1. sodium hydroxide is prepared into a certain concentration of solution, into the reactor.
2. Sulfur dioxide gas is introduced, and the stirrer is started at the same time to make the gas fully contact with sodium hydroxide solution.
3. The reaction temperature is controlled to maintain the pH in the desired range by adjusting the rate of sulfur dioxide feed.
4. During the reaction, the generated sodium bisulfite will precipitate crystals. When the crystal reaches a certain amount, the sulfur dioxide is stopped and the reaction is terminated.
5. The reaction solution was filtered to separate sodium bisulfite crystals and a mother liquor.
6. The sodium bisulfite crystals are washed and dried to obtain the final sodium bisulfite product.

4. precautions

1. control the reaction temperature and pH value, so as not to affect the product quality and yield.
2. The stirring speed should be moderate to ensure that the gas is fully in contact with the solution and to avoid crystal breakage.
3. Keep the equipment airtight during the reaction to prevent sulfur dioxide leakage.
4. Operators should wear protective equipment to avoid contact with harmful substances.

5. conclusion

the method of preparing sodium bisulfite by chemical reaction with sodium hydroxide and sulfur dioxide as raw materials is feasible. In the actual production process, good control of reaction conditions, can get high quality products. At the same time, the method is simple, low cost, and has a good prospect of industrialization. Through the introduction of this paper, it is hoped that it can provide some reference for the manufacture of sodium bisulfite.

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