Sulfur dioxide
Chemical formula: SO2
CAS number: 7446-09-5
UN number: 1079
EINECS number: 231-195-2
Molecular weight: 64.07
Appearance: colorless, with pungent odor
Melting point: -75.5 ℃
Boiling point: -10 ℃
Density: 2.9275 kg/m³
DOT class: 2.3 & 8
Tags: toxic gas, corrosive
Packaging specifications
| Cylinder specifications | Content | |
| Cylinder capacity | Valve | Weight |
| 40L | QF-10 | 40-50kg |
| 800L | QF-10 | 1000kg |
Industrial grade sulfur dioxide 99.9%
| Specifications | 99.9% |
| Residue | ≤ 0.04 % |
| Wa | ≤ 0.06 % |
| Arsenic | ≤ 0.000004 % |
Electronic grade sulfur dioxide 99.999%
| Specifications | 99.999% |
| Hydrogen | ≤ 0.5ppm |
| Oxygen + Argon | ≤ 1 ppm |
| Nitrogen | ≤ 4 ppm |
| Methane | ≤ 0.5ppm |
| Carbon monoxide | ≤ 0.5ppm |
| Carbon dioxide | ≤ 1 ppm |
| Carbonyl sulfide | ≤ 1 ppm |
| Carbon disulfide | ≤ 1 ppm |
| Hydrogen sulfide | ≤ 0.5ppm |
| Ethylene | ≤ 0.5ppm |
| Propane | ≤ 0.5ppm |
| N-butane | ≤ 0.5ppm |
| Isobutane | ≤ 0.5ppm |
| Water | ≤ 2 ppm |
| Total impurity content | ≤ 10 ppm |
Gas Introduction
Sulfur dioxide is the most common and simplest sulfur oxide, with the chemical formula SO2. It is a colorless, transparent gas with a pungent odor. It is soluble in water, ethanol and ether. Sulfur dioxide is one of the main pollutants in the atmosphere. The gas is ejected during volcanic eruptions and is also produced in many industrial processes. Since coal and oil usually contain sulfur, sulfur dioxide is produced when they are burned. When sulfur dioxide is dissolved in water, sulfurous acid is formed. If sulfurous acid is further oxidized in the presence of PM2.5. sulfuric acid (one of the main components of acid rain) is quickly and efficiently generated. 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. It is used as an organic solvent and refrigerant, and is used to refine various lubricating oils.
2. It is mainly used in the production of sulfur trioxide, sulfuric acid, sulfites, thiosulfates, and is also used as a fumigant, preservative, disinfectant, reducing agent, etc.
3. Sulfur dioxide is a reducing bleaching agent allowed for use in China. It has a bleaching effect on food and a strong inhibitory effect on oxidase in plant foods. China stipulates that it can be used for wine and fruit wine, with a maximum usage of 0.25g/kg and a residual amount of no more than 0.05g/kg.
4. Pesticides, artificial fibers, dyes and other industrial sectors.
5. Used in the production of sulfur and as an insecticide and fungicide.
