Uses:
In addition to the main use of sulfur dioxide in the production of sulfuric acid, other important uses are: in the paper industry to produce sulfite pulp; Manufacture all kinds of sulfites, bisulfite, thiosulfate; Production of polyamide (nylon 6) monomer, synthetic detergent, rubber accelerator and other organic compounds; It is also used in the pharmaceutical industry. Sulfur dioxide can also be used as a bleach agent for fabrics and leather; Used in agriculture as a fumigant; Used as a preservative and disinfectant in the food industry. Liquid sulfur dioxide is a good solvent for some organic matter and is used for refining mineral oils.
Sulfur dioxide has bleaching and anti-corrosion effect on food, the use of sulfur dioxide can achieve the appearance of the product bright, white effect, is commonly used in food processing bleaching agents and preservatives, but must be strictly in accordance with the relevant national scope and standards used, otherwise, it will affect human health.
1. Wine making: Sulfur dioxide is a very useful compound in wine making.
2. Reducing bleach: Sulfur dioxide is also a good reducing agent. In the presence of water, sulfur dioxide can discolor substances. In particular, it is a useful bleach for paper and clothing. This bleaching effect usually does not last long. Oxygen in the air reoxidizes the reduced dye and restores the color.
3. Precursor of sulfuric acid: sulfur dioxide is also used to prepare sulfuric acid, first converted into sulfur trioxide, then converted into fuming sulfuric acid, and finally converted into sulfuric acid.
4. Refrigerant: Because sulfur dioxide is easy to liquefy, and the heat of vaporization is very large, it is suitable as a refrigerant. Before the development of freon, sulfur dioxide was used as a refrigerant in household refrigerators.
5. Reagents and solvents: Liquid sulfur dioxide is a universal inert solvent, widely used to dissolve strong oxidizing salts.
6. Dechlorination: In urban sewage treatment, sulfur dioxide is used to treat chlorinated sewage before discharge.