Sulphur Di Oxide
Sulfur Dioxide, SO2, Sulfurous Anhydride.
- CAS
- 7446-09-5
- EC
- 231-195-2
- Sectors
- Textiles, Leather & Paper, Food & Nutrition, Mining & Metals
Sulphur Di Oxide (CAS 7446-09-5) is an inorganic sulfur oxide gas, colorless and pungent, supplied as a liquefied compressed gas at 99.9% purity in Technical Grade and Food Grade for antimicrobial preservation, bleaching, dye stripping, leather tanning and metal extraction. It is a highly effective antimicrobial and bleaching agent used across diverse manufacturing sectors.
This gas maintains a 99.9% Purity level, ensuring high performance in the preservation of beverages and the purification of sugar. It acts as a powerful Reducing Agent in the textile industry for stripping dyes and bleaching natural fibers.
In chemical synthesis, it serves as a precursor to sulfuric acid and various sulfonyl compounds. It is essential for the Tanning Process in leather production, where it aids in the stabilization of collagen fibers.
Typical Properties
| Molecular formula | O2S |
|---|---|
| Molecular weight | 64.06 g/mol |
| Form | colorless gas |
| Color | colorless |
| Odor | Pungent odor detectable at 0.3 to 5 ppm |
| Melting point | -75.5 °C |
| Boiling point | -10.05 °C |
| Density | 2.811 x 10<sup>-3</sup> g/cm³ |
| GHS signal word | Danger · Compressed gas, Corrosive, Acute toxicity, Irritant / harmful, Health hazard |
| Grades available | Technical Grade, Food Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Sulphur Di Oxide
Applications
- Food and Beverage: Acts as a preservative and antioxidant in wine making and dried fruit processing to prevent spoilage and oxidation.
- Pulp and Paper: Used as a bleaching agent and for the dechlorination of pulp after bleaching stages.
- Metal Extraction: Employed in the mining industry for the extraction of precious metals and as a reducing agent in leaching.
Safety & Risks
Classified as Toxic if Inhaled and Skin Corrosion. Compressed gas; use Self-Contained Breathing Apparatus (SCBA) and Acid-Resistant Suit.
Packaging
Steel Cylinders (50kg-800kg), Tonne Tanks, and specialized bulk gas containers.