Overview
3-Aminophenol is an important aromatic compound where an amino group (-NH2) and hydroxyl group (-OH) are positioned at meta locations on the benzene ring. This structural arrangement gives it unique reactivity patterns distinct from its ortho and para isomers. The compound has been commercially significant since the early 20th century, primarily serving as a building block for more complex molecules. Industrial production typically involves the reduction of 3-nitrophenol or amination of resorcinol. Its dual functionality allows participation in both electrophilic aromatic substitution and condensation reactions, making it versatile for synthetic chemistry applications. The global market demand is steadily growing at 3-5% annually, driven by expanding dye and pharmaceutical sectors.
Physical and Chemical Properties
As a crystalline solid, 3-aminophenol exhibits moderate stability under normal conditions but gradually darkens upon exposure to air and light due to oxidation. Its weak basic character (pKa ~9.8) enables salt formation with mineral acids. The compound shows characteristic UV absorption at 274 nm, useful for analytical quantification. Thermochemical properties include a heat of combustion of 3,250 kJ/mol and flash point of 165°C. It undergoes typical reactions of both phenols and aromatic amines - capable of diazotization, azo coupling, and ether formation. When heated to decomposition, it emits toxic fumes including nitrogen oxides, requiring proper ventilation in industrial settings.
Main Applications
Approximately 65% of global 3-aminophenol production is consumed by the dye industry, where it serves as a key intermediate for azo dyes and sulfur dyes. These dyes find application in textiles, leather, and paper coloring. The pharmaceutical sector utilizes it in synthesizing various drugs including antiseptics, analgesics, and antipyretics. In personal care, it's a component in permanent hair dyes (typically at 0.5-2% concentration) where it reacts with couplers to form colored complexes. Emerging applications include use as a corrosion inhibitor in metalworking fluids and as a monomer for specialty polymers. Japanese manufacturers have recently developed high-purity grades (99.9%) for electronic chemicals applications.
Safety and Storage
Classified as harmful (Xn) under EU regulations, 3-aminophenol requires proper PPE including chemical goggles, gloves, and respirators when handling powder forms. The LD50 (oral, rat) is 1,250 mg/kg, indicating moderate toxicity. Prolonged exposure may cause methemoglobinemia, requiring immediate medical attention. Storage recommendations include amber glass bottles or polyethylene-lined steel drums in temperature-controlled areas (<30°C) with relative humidity below 70%. Incompatible materials include strong oxidizers, acid chlorides, and alkaline earth metals. Spills should be contained with inert absorbents and disposed as hazardous waste according to local regulations.
B2B Procurement Guide
Industrial buyers should specify technical grade (≥98%) or pharmaceutical grade (≥99.5%) based on application requirements. Key quality indicators include melting point range (121-124°C), ash content (<0.1%), and absence of insoluble matter. Packaging options range from 25kg fiber drums to 1kg aluminum foil bags. Leading manufacturers include Sino-High (China), Aarti Industries (India), and Tokyo Chemical Industry (Japan). Minimum order quantities typically start at 500kg, with pricing tiers for multi-ton purchases. Request batch analysis certificates and ensure suppliers provide proper hazardous material transportation documentation. Consider CIF terms for international shipments to mitigate logistics risks.
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