Benzenesulfonic acid

Benzenesulfonic acid is an aromatic sulfonic acid with the chemical formula C6H6O3S and CAS number 98-11-3. This organic compound consists of a benzene ring with a sulfonic acid group (-SO3H) attached, giving it both aromatic and acidic properties. With a molecular weight of 158.18 g/mol, it serves as an important intermediate in chemical synthesis and industrial applications.

Benzenesulfonic acid is a colorless to light yellow crystalline solid at room temperature with a characteristic acidic odor. It is highly soluble in water and polar solvents due to its sulfonic acid group, which makes it a strong acid. The compound is hygroscopic, meaning it readily absorbs moisture from air, and has good thermal stability under normal conditions.

Benzenesulfonic acid is primarily used as an intermediate in the production of detergents, pharmaceuticals, and dyes. It serves as a catalyst in various chemical reactions, particularly in esterification and polymerization processes. The compound is also utilized in the manufacture of phenol, resorcinol, and other aromatic compounds through sulfonation reactions in the chemical industry.

Benzenesulfonic acid requires standard laboratory safety precautions during handling. Wear appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing. Work in well-ventilated areas or under fume hoods to avoid inhalation. Avoid direct skin and eye contact, and ensure proper grounding when transferring the material to prevent static discharge.

Benzenesulfonic acid should be stored in a cool, dry place away from heat sources and direct sunlight. Keep containers tightly sealed to prevent moisture absorption due to its hygroscopic nature. Store away from incompatible materials such as strong bases, oxidizing agents, and metals. Use corrosion-resistant containers and ensure proper ventilation in storage areas.

Benzenesulfonic acid contact requires immediate action depending on exposure type. For skin contact, immediately flush with plenty of water for at least 15 minutes and remove contaminated clothing. In case of eye contact, rinse thoroughly with water and seek medical attention. If inhaled, move to fresh air immediately. For ingestion, do not induce vomiting and seek immediate medical attention.

Benzenesulfonic acid disposal must comply with local and national waste management regulations. The compound should be treated as chemical waste and disposed of through licensed waste management facilities. Small quantities can be neutralized carefully with appropriate bases before disposal, but this should only be done by trained personnel following proper safety protocols and regulatory guidelines.

Benzenesulfonic acid is classified under ADR Class 8 (corrosive substances) with Packaging Group III for transportation purposes. This classification requires appropriate corrosive substance packaging and labeling during transport. Proper documentation, including transport documents and safety data sheets, must accompany shipments. Carriers must comply with ADR regulations for corrosive materials handling and emergency procedures.

Benzenesulfonic acid is subject to standard chemical regulations including REACH registration requirements in Europe and CLP classification obligations. The substance is not classified as SVHC (Substance of Very High Concern) and currently has no specific harmonized classification under CLP. Standard industrial chemical handling, storage, and workplace safety regulations apply to its use and distribution.

Benzenesulfonic acid is available through OYSI, a European distributor specializing in technical chemicals and industrial raw materials. OYSI provides reliable supply chains across Europe with proper documentation and regulatory compliance. Contact OYSI directly for availability, specifications, packaging options, and delivery arrangements to meet your specific industrial or research requirements.