Benzenesulfonic acid

Benzenesulfonic acid is an aromatic sulfonic acid compound with the molecular formula C6H6O3S and CAS number 98-11-3. This organic chemical features a benzene ring directly bonded to a sulfonic acid group (-SO3H), making it the simplest aromatic sulfonic acid. With a molecular weight of 158.18 g/mol, it serves as an important intermediate in chemical synthesis and industrial processes.

Benzenesulfonic acid is a colorless to light yellow crystalline solid at room temperature with a characteristic acidic odor. It exhibits excellent water solubility due to its sulfonic acid group, forming strongly acidic aqueous solutions. The compound is hygroscopic, readily absorbing moisture from air, and demonstrates high thermal stability. It shows limited solubility in non-polar organic solvents but dissolves well in polar solvents.

Benzenesulfonic acid is primarily used as a chemical intermediate in the production of detergents, surfactants, and pharmaceutical compounds. It serves as a key building block for synthesizing phenol through alkali fusion and acts as a catalyst in various organic reactions. The compound is also utilized in electroplating processes, as a corrosion inhibitor, and in the manufacturing of dyes and specialty chemicals.

Benzenesulfonic acid should be handled with appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing to prevent skin and eye contact. Work in well-ventilated areas or use local exhaust ventilation to avoid inhalation of vapors or dust. Avoid contact with strong bases and oxidizing agents. Always wash hands thoroughly after handling and ensure emergency eyewash stations are accessible.

Benzenesulfonic acid should be stored in tightly sealed containers in a cool, dry, well-ventilated area away from direct sunlight and heat sources. Keep the material separated from strong bases, metals, and oxidizing agents to prevent incompatible reactions. Use corrosion-resistant containers such as glass or suitable plastic materials. Maintain storage temperatures below 25°C and protect from moisture to prevent degradation.

In case of skin contact with benzenesulfonic acid, immediately remove contaminated clothing and rinse the affected area with plenty of water for at least 15 minutes. For eye contact, flush eyes immediately with clean water for 15-20 minutes and seek medical attention. If inhaled, move the person to fresh air and seek medical advice if breathing difficulties occur. In case of ingestion, do not induce vomiting and seek immediate medical attention.

Benzenesulfonic acid disposal must comply with local, national, and international waste regulations. The material should be collected in suitable containers and disposed of through licensed waste management companies specializing in chemical waste treatment. Small quantities may be neutralized carefully with appropriate bases before disposal, but this should only be done by trained personnel. Never dispose of the substance down drains or into the environment.

Benzenesulfonic acid is classified under ADR as Class 8 (corrosive substances), Packing Group III for transportation purposes. It must be packaged in UN-approved containers suitable for corrosive materials and properly labeled with appropriate hazard markings. Transport vehicles must carry emergency response information and drivers should be trained in handling hazardous materials. Ensure compliance with all applicable transportation regulations for corrosive substances.

Benzenesulfonic acid is subject to standard chemical regulations including REACH registration requirements in the European Union. While it is not classified as a Substance of Very High Concern (SVHC), it must comply with CLP regulation for classification, labeling, and packaging. Users must follow occupational safety standards, environmental protection laws, and maintain safety data sheets. Regular monitoring of regulatory updates is recommended for compliance.

Benzenesulfonic acid is available through OYSI, a reliable European distributor of technical chemicals serving industrial customers across Europe. OYSI provides quality chemical products with proper documentation and regulatory compliance support. Contact OYSI directly for pricing, availability, technical specifications, and delivery options tailored to your specific requirements. They offer professional service and expertise in chemical distribution throughout European markets.