Manufacturing method of sulfur dioxide
I. INTRODUCTION
Sulfur dioxide is an important inorganic chemical raw material, which is widely used in the fields of chemical industry, light industry, textile, medicine, pesticide and so on. In the field of raw materials for chemical production, the manufacturing methods of sulfur dioxide have attracted much attention because different manufacturing methods affect the purity, yield and production cost of the product. This article will introduce several common manufacturing methods of sulfur dioxide.
Two, sulfuric acid method
Sulfuric acid method is a common method of manufacturing sulfur dioxide, the principle is to add sulfurite or sulfur in sulfuric acid, so that it reacts to produce sulfur dioxide. The specific steps are as follows:
1. After crushing the sulfurous iron ore or sulfur, mix it well with air and send it to the roaster for roasting.
2. The gas generated from roasting is purified and cooled, and then sent to the absorption tower to react with sulfuric acid to generate sulfur dioxide.
3. The ferrous sulfate or sodium sulfite generated in the absorption tower is processed to obtain products such as ferrous sulfate or sodium sulfite.
The advantage of the sulfuric acid method is that it can reduce costs by utilizing sulfite or sulfur, which is a waste product of the sulfuric acid production process, as a raw material. However, the production process of this method will produce a large amount of waste gas and waste water, and need to be equipped with perfect environmental protection facilities.
Three, sulfur method
Sulfur method is a relatively simple method of sulfur dioxide manufacturing, the principle is to burn sulfur to generate sulfur dioxide. Specific steps are as follows:
1. The sulfur is heated and melted, and then sprayed into the combustion chamber to generate sulfur dioxide.
2. The gas generated by combustion is cooled and purified to obtain the sulfur dioxide product.
The advantage of the sulfur method is that the process is simple and easy to operate, but the method requires the consumption of a large amount of energy and raw materials, and the production cost is high.
Four, electrolysis method
Electrolysis method is a more advanced sulfur dioxide manufacturing method, the principle is to generate sulfur dioxide through electrolysis of sulfite solution. The specific steps are as follows:
1. The sulfite solution is fed into the electrolysis tank, and direct current is passed through for electrolysis.
2. Oxygen and hydrogen produced by electrolysis are mixed and react with the sulfite to generate sulfur dioxide.
3. The rate and purity of sulfur dioxide production can be controlled by adjusting the electrolysis conditions and solution concentration.
The advantages of electrolysis method are high product purity and environmentally friendly production process, but it needs to consume a large amount of electric energy and raw materials, and the production cost is high.
V. Conclusion
Three common methods of sulfur dioxide manufacturing have been 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 consider the source of raw materials, production costs, environmental requirements and other factors to choose the most suitable manufacturing method.
