Sulfur dioxide, colorless gas, has a strong pungent smell, density big than air.
One of the major pollutants in the atmosphere.Because coal and oil usually contain sulfur compounds, sulfur dioxide is released when burned.When sulfur dioxide dissolves in water, it forms sulfurous acid (the main component of acid rain).When SO2 is further oxidized, sulfuric acid is produced in the presence of a catalyst such as nitrogen dioxide.Sulfuric acid Is one of the main pollutants in the atmosphere, and sulfur dioxide is easy to be absorbed by the wet mucous membrane surface to produce sulfurous acid, sulfuric acid which have the intense stimulation effect to eyes and the breathing tract mucous membrane.Large inhalation can cause pulmonary edema, laryngeal edema, vocal cord spasm and even asphyxiation, so the relevant units must pay attention to the leakage of sulfur dioxide.
1. Gas features:
Color: colorless toxic gas with pungent smell at room temperature
Melting point: -72.4℃ (200.75k)
Boiling point: -10℃ (263K)
Density and state: 2.551g/L, gas (standard condition)
2. Sulfur dioxide application:
Sulfur dioxide have effect on food bleaching and antiseptic, the use of sulfur dioxide can make the products appearance bright and white, it is commonly used in food processing bleach and preservatives, but must be strictly in accordance with the scope and standards of use, otherwise, will affect human health.
3. The harms of different concentrations of sulfur dioxide:
Human physiological response: 0.3~1ppm
Perceptible concentration:2ppm
Allowable exposure concentration (OSHA, ACGIH) : 3ppm
Very easy to detect smell: 6 to 12ppm
Nose and throat irritation: 20ppm
Eye irritation: 50~100ppm
Large exposure concentration within 30 minutes: 400~500ppm
4. Emergency treatment for sulfur dioxide leakage:
Evacuate to the windward immediately and isolate immediately. For small leakage, isolate them 150m; for large leakage, isolate them 450m. Access is strictly restricted.It is recommended that emergency personnel wear self - contained positive pressure breathing apparatus and protective clothing.Cut off the leak source as soon as possible.Reasonable ventilation, accelerate diffusion.Spray water to dilutes and dissolves.
Although sulfur dioxide is a very dangerous gas, but with the development of industry, it has been widely used in a variety of industries, so in the relevant enterprises, it is a must to install sulfur dioxide gas alarm detector, once found that the leakage needs to be timely treatment to avoid the occurrence of accidents!
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