Sulfurous acid (CAS 7782-99-2) is a chemical compound that plays a significant role in various industrial sectors, primarily due to its versatile properties as a reducing agent, disinfectant, and mild bleaching agent. While it is known to be unstable in its pure form, its aqueous solutions are widely utilized across manufacturing, research, and processing industries. For businesses seeking reliable chemical suppliers, understanding the fundamental aspects of Sulfurous Acid, including its properties, applications, and safety considerations, is paramount. As a leading manufacturer and supplier of chemicals in China, we provide essential information for procurement managers and scientists.

Key Chemical Properties and Forms

Sulfurous acid is formed when sulfur dioxide gas dissolves in water. Its chemical formula is H2SO3. The compound is characterized by its reducing capabilities, meaning it can donate electrons in chemical reactions, often being oxidized to sulfuric acid. This makes it a valuable reagent in processes requiring controlled reduction. Additionally, it acts as a mild oxidizing agent in some reactions. The compound is typically supplied as a clear, colorless liquid, often with a concentration around 5-6% sulfur dioxide.

Due to its instability, pure anhydrous sulfurous acid is not commercially available. Instead, users procure aqueous solutions of sulfur dioxide. Handling requires an awareness of its potential to decompose back into sulfur dioxide and water, especially when heated or concentrated. Proper storage in well-sealed containers is essential.

Industrial Applications of Sulfurous Acid

The broad utility of Sulfurous Acid makes it a sought-after chemical for a variety of industrial purposes:

  • Reducing Agent: In chemical synthesis, it serves as a reliable reagent for reducing various compounds, facilitating specific reaction pathways.
  • Disinfectant: Its antimicrobial properties are utilized in sanitation processes, water treatment, and preserving certain materials by inhibiting microbial growth.
  • Mild Bleaching Agent: Sulfurous acid is used to bleach materials like wool, silk, feathers, and paper. Its mild nature is advantageous for substrates sensitive to harsher bleaching chemicals.
  • Chemical Intermediate: It can be used in the synthesis of other sulfur-containing organic and inorganic compounds.

For procurement professionals, understanding these applications helps in specifying the required purity and concentration when you buy Sulfurous Acid.

Safety and Handling Precautions

Like many industrial chemicals, Sulfurous Acid requires careful handling. It is corrosive and can cause irritation to skin, eyes, and the respiratory tract. Proper personal protective equipment (PPE), including gloves, safety goggles, and appropriate ventilation, is essential when working with it. Storage should be in cool, dry, and well-ventilated areas, away from incompatible materials such as strong bases and oxidizers. Always consult the Safety Data Sheet (SDS) provided by the manufacturer for detailed safety instructions.

Reliable Sourcing from China

As a prominent chemical manufacturer and supplier in China, we are committed to delivering high-quality Sulfurous Acid (CAS 7782-99-2) that meets rigorous industry standards. We ensure consistent product quality, competitive pricing, and a reliable supply chain, making us an ideal partner for your chemical procurement needs. We encourage you to contact us for inquiries and quotes, and to learn more about how our Sulfurous Acid can benefit your industrial applications.