Phenolsulfonic acid

Phenolsulfonic acid (CAS 1333-39-7), also known as benzenesulfonic acid monohydrate, is a strong organic acid used industrially as a catalyst and pH-regulating agent.

Where is Phenolsulfonic acid used?

• Pharmaceutical manufacturing: acid catalyst in synthesis steps and counterion in salt formation for active pharmaceutical ingredients
• Textile processing: pH regulation in dyeing and finishing baths to improve dye uptake
• Leather processing: supports tanning and retanning where controlled acidity is critical
• Water treatment: sulfonating agent and process chemical for pH control in industrial effluent systems
• Its acidic and phenolic functionality drives reactions and controls process chemistry.

Commercial specifications

• Aqueous solution, concentration typically around 65% w/w
• Other concentrations available