Gas Introduction
Sulfur dioxide is the most common and simplest sulfur oxide, with the chemical formula SO2. It is a colorless and transparent gas with a pungent odor. Dissolve in water, ethanol, and ether. Sulfur dioxide is one of the main pollutants in the atmosphere. During volcanic eruptions, this gas is released, and in many industrial processes, sulfur dioxide is also produced. Due to the presence of sulfur in coal and petroleum, sulfur dioxide is generated during combustion. When sulfur dioxide dissolves in water, it forms sulfurous acid. If sulfurous acid is further oxidized in the presence of PM2.5, it will rapidly and efficiently generate sulfuric acid (one of the main components of acid rain). This is one of the reasons for concerns about the environmental effects of using these fuels as energy sources.
Sulfur dioxide is mainly used for:
1. Used as an organic solvent and refrigerant, and for refining various lubricating oils.
2. Mainly used for the production of sulfur trioxide, sulfuric acid, sulfite, thiosulfate, and also used as a fumigant, preservative, disinfectant, reducing agent, etc.
3. Sulfur dioxide is a reducing bleaching agent allowed to be used in China. It has a bleaching effect on food and a strong inhibitory effect on oxidases in plant-based foods. According to Chinese regulations, it can be used for wine and fruit wine, with a maximum usage of 0.25g/kg and a residue level not exceeding 0.05g/kg.
4. Industrial sectors such as pesticides, synthetic fibers, dyes, etc.
5. Used for producing sulfur and as insecticides and fungicides.

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