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[Chemical Knowledge]：Production and manufacturing method and process of sulfur dioxide

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The manufacturing method
of sulfur dioxide
1. Introduction

Sulfur dioxide is an important inorganic chemical raw material, which is widely used in chemical industry, light industry, textile, medicine, pesticide and other fields. In the field of chemical production raw materials, the manufacturing method of sulfur dioxide has attracted much attention, because different manufacturing methods will affect the purity, yield and production cost of the product. This article will introduce several common sulfur dioxide manufacturing methods.

2. sulfuric acid method

sulfuric acid method is a common sulfur dioxide manufacturing method, the principle is to add pyrite or sulfur in sulfuric acid, so that the reaction to generate sulfur dioxide. The specific steps are as follows:

1. After pyrite or sulfur is crushed, it is evenly mixed with air and sent to a roasting furnace for roasting.
2. The gas produced by roasting is purified and cooled, and then sent to the absorption tower to react with sulfuric acid to generate sulfur dioxide.
3. Ferrous sulfate or sodium sulfite generated in the absorption tower can be treated to obtain products such as ferric sulfate or sodium sulfite. The advantage of

sulfuric acid method is that the waste pyrite or sulfur in the sulfuric acid production process can be used as raw materials to reduce costs. However, the production process of this method will produce a large amount of waste gas and waste water, which requires complete environmental protection facilities.

3. sulfur method

sulfur method is a relatively simple sulfur dioxide manufacturing method, the principle is to generate sulfur dioxide combustion. The specific steps are as follows:

1. After the sulfur is heated and melted, it is injected into the combustion chamber to burn and generate sulfur dioxide.
2. The gas produced by combustion is cooled and purified to obtain sulfur dioxide products. The advantages of

sulfur method are simple process and convenient operation, but this method needs to consume a lot of energy and raw materials, and the production cost is high.

4. electrolysis

electrolysis is a more advanced sulfur dioxide manufacturing method, the principle is to generate sulfur dioxide by electrolytic sulfite solution. The specific steps are as follows:

1. send the sulfite solution into the electrolytic cell and pass the direct current for electrolysis.
2. Oxygen and hydrogen produced by electrolysis are mixed and reacted with sulfite to form sulfur dioxide.
3. By adjusting the electrolysis conditions and solution concentration, the generation rate and purity of sulfur dioxide can be controlled. The advantages of

electrolysis method are high product purity and environmental protection in the production process, but it needs to consume a lot of electricity and raw materials, and the production cost is high.

5. Conclusion

Three common sulfur dioxide manufacturing methods are introduced above, including sulfuric acid method, sulfur method and electrolysis method. Different manufacturing methods have different advantages and disadvantages and scope of application, and need to be selected according to the specific situation. In the actual production process, it is necessary to comprehensively consider the source of raw materials, production costs, environmental protection requirements and other factors to choose the most suitable manufacturing method.

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