4-aminobenzenesulfonic acid

4-aminobenzenesulfonic acid is an organic compound with the molecular formula C6H7NO3S and CAS number 121-57-3. This aromatic sulfonic acid derivative contains both amino and sulfonic acid functional groups on a benzene ring. With a molecular weight of 173.19 g/mol, it appears as a white to off-white crystalline powder. The compound is classified as a skin and eye irritant and potential skin sensitizer under GHS regulations.

4-aminobenzenesulfonic acid is a white to off-white crystalline solid at room temperature with a molecular weight of 173.19 g/mol. The compound is highly soluble in water due to its sulfonic acid group, which provides strong ionic character. It exhibits typical aromatic compound stability while maintaining the reactivity of both amino and sulfonic acid functional groups. The substance is odorless and stable under normal storage conditions.

4-aminobenzenesulfonic acid is primarily used as an intermediate in the synthesis of dyes, pigments, and pharmaceuticals. It serves as a key building block in the production of azo dyes and sulfonamide drugs. The compound is also utilized in analytical chemistry as a reagent and in the manufacture of optical brightening agents. Its dual functional groups make it valuable for various chemical modifications in industrial applications.

4-aminobenzenesulfonic acid requires careful handling due to its skin and eye irritation potential and skin sensitization properties. Wear appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing. Ensure adequate ventilation in work areas and avoid generating dust. Wash hands thoroughly after handling and avoid contact with skin, eyes, and clothing. Work in well-ventilated areas or use local exhaust ventilation systems.

4-aminobenzenesulfonic acid should be stored in tightly closed containers in a cool, dry, well-ventilated area away from direct sunlight and heat sources. Keep containers sealed when not in use to prevent moisture absorption and contamination. Store away from strong oxidizing agents and incompatible materials. Maintain storage temperatures below 25°C and ensure proper labeling according to GHS requirements. Regularly inspect containers for damage or deterioration.

In case of skin contact with 4-aminobenzenesulfonic acid, immediately remove contaminated clothing and wash the affected area thoroughly with soap and water for at least 15 minutes. For eye contact, rinse immediately with plenty of clean water for at least 15 minutes while holding eyelids open. If inhaled, move to fresh air immediately. Seek medical attention if irritation persists or if allergic reactions develop, especially given its skin sensitization potential.

4-aminobenzenesulfonic acid must be disposed of in accordance with local, national, and international waste regulations. Contact licensed waste disposal companies for proper handling and treatment. Do not discharge into drains, waterways, or soil. Small quantities may require neutralization before disposal, while larger amounts need specialized chemical waste treatment. Maintain proper documentation of disposal activities and follow your facility's waste management procedures.

4-aminobenzenesulfonic acid does not appear to have specific ADR classification requirements, suggesting it may not be classified as dangerous goods for transport purposes. However, packages should be properly labeled according to GHS requirements with appropriate hazard pictograms and safety information. Ensure containers are securely closed and protected from damage during transport. Follow general chemical transport guidelines and maintain proper documentation including safety data sheets.

4-aminobenzenesulfonic acid is subject to standard chemical regulations including REACH registration requirements in Europe and CLP classification for hazard communication. It is not currently listed as a Substance of Very High Concern (SVHC). Users must comply with workplace safety regulations, proper labeling requirements under GHS, and maintain safety data sheets. Industrial users should ensure compliance with local occupational exposure limits and reporting requirements.

4-aminobenzenesulfonic acid is available through OYSI, a trusted European distributor of specialty chemicals serving various industries across the continent. OYSI provides high-quality chemical products with proper documentation, safety data sheets, and regulatory compliance support. Contact OYSI's technical team for product specifications, availability, and delivery options throughout Europe. Professional customers can rely on OYSI's expertise in chemical distribution and customer service.