4-methylbenzenesulfonic acid

4-methylbenzenesulfonic acid is an organic sulfonic acid compound with the molecular formula C7H8O3S and CAS number 104-15-4. This aromatic sulfonic acid has a molecular weight of 172.2 g/mol and consists of a benzene ring substituted with both a methyl group and a sulfonic acid group. It appears as a white to off-white crystalline solid and is classified as a mild irritant to skin and eyes.

4-methylbenzenesulfonic acid is a white to light yellow crystalline solid at room temperature with good water solubility due to its sulfonic acid group. The compound has a molecular weight of 172.2 g/mol and exhibits hygroscopic properties, meaning it can absorb moisture from air. It demonstrates thermal stability under normal conditions and shows typical behavior of aromatic sulfonic acids in chemical reactions.

4-methylbenzenesulfonic acid is primarily used as a catalyst in organic synthesis reactions, particularly in esterification and polymerization processes. It serves as an intermediate in the production of dyes, pharmaceuticals, and specialty chemicals. The compound is also employed in electroplating solutions and as a pH regulator in various industrial applications. Its strong acidic properties make it valuable in chemical manufacturing processes.

4-methylbenzenesulfonic acid requires careful handling with 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 of dust or vapors. Avoid direct skin and eye contact as the substance can cause irritation. Use non-sparking tools and ensure proper grounding to prevent static electricity buildup during transfer operations.

4-methylbenzenesulfonic acid should be stored in a cool, dry, well-ventilated area away from incompatible materials such as strong bases, oxidizing agents, and metals. Keep containers tightly closed and protected from moisture due to its hygroscopic nature. Store in original labeled containers made of compatible materials and maintain storage temperatures below 25°C. Ensure storage areas are equipped with appropriate spill containment measures.

In case of skin contact with 4-methylbenzenesulfonic acid, immediately remove contaminated clothing and wash the affected area thoroughly with soap and water for at least 15 minutes. For eye contact, flush eyes with clean water for at least 15 minutes and seek immediate medical attention. If inhaled, move the person to fresh air and seek medical advice if respiratory irritation occurs. Always consult a physician if symptoms persist.

4-methylbenzenesulfonic acid must be disposed of according to local, regional, and national waste regulations as a chemical waste. Contact licensed waste disposal companies for proper treatment and disposal. The substance should not be discharged into drains, soil, or water bodies. Small quantities may be neutralized carefully with appropriate bases under controlled conditions, but this should only be done by trained personnel following proper safety protocols.

4-methylbenzenesulfonic acid is classified as ADR Class 8 (Corrosive substances), Packing Group III for transportation purposes. It must be packaged in UN-approved containers with proper labeling including corrosive hazard markings and transport documentation. Vehicles must carry appropriate emergency equipment and drivers require ADR certification. Ensure packages are secured against movement and protected from damage during transport.

4-methylbenzenesulfonic acid is regulated under the CLP Regulation with classification as STOT SE 3, Skin Irrit. 2, and Eye Irrit. 2, requiring Warning signal word and GHS07 pictogram. It falls under REACH regulation for registration and safety data sheet requirements. The substance is not listed as SVHC (Substance of Very High Concern) and has no specific use restrictions, but standard industrial chemical handling regulations apply.

4-methylbenzenesulfonic acid is available through OYSI, a professional European distributor of technical chemicals serving industrial customers across Europe. OYSI provides reliable supply with proper documentation including safety data sheets and certificates of analysis. As a specialized chemical distributor, OYSI ensures compliance with European regulations and maintains quality standards for industrial applications. Contact OYSI for availability, specifications, and technical support.