Overview
Resorcinol is an aromatic organic compound belonging to the phenol family, featuring two hydroxyl groups in the meta position. First isolated in 1864 from birch tar, it now sees large-scale synthetic production through sulfonation of benzene followed by alkali fusion. The compound's dual functionality enables diverse chemical reactions, including electrophilic substitution and resin formation. As a bulk chemical, global production exceeds 50,000 metric tons annually. Major manufacturers concentrate in China, Germany, and the United States. Its versatility spans industrial, cosmetic, and therapeutic applications, though regulatory scrutiny applies to certain uses due to potential skin sensitization.
Physical and Chemical Properties
Resorcinol crystallizes in colorless to white needles with a faint phenolic odor. It exhibits higher water solubility (1230 g/L at 20°C) than comparable phenols due to hydrogen bonding. The compound shows characteristic UV absorption at 273 nm, useful for analytical quantification. Chemically, it undergoes halogenation, nitration, and coupling reactions more readily than phenol. When combined with formaldehyde, it forms high-performance resorcinol-formaldehyde resins with superior heat and moisture resistance compared to phenol-formaldehyde variants. The pKa values of 9.15 and 11.06 reflect its weak acidity.
Main Applications
In tire manufacturing, resorcinol acts as a key adhesion promoter between rubber and textile reinforcements (RFL dips), accounting for 60% of consumption. The cosmetic industry utilizes 2% solutions in hair dyes and acne preparations for its keratolytic action. Woodworking adhesives leverage its fast-curing resins for marine plywood. Specialty applications include UV stabilizers in plastics and as an intermediate for flame retardants like tetrabromoresorcinol. Pharmaceutical grades serve as antiseptics in ointments (1-3% concentration).
Safety and Storage
Classified as Acute Toxicity Category 4 (oral) and Skin Irritation Category 2 under GHS. Prolonged skin contact may cause depigmentation or allergic dermatitis. Engineering controls should maintain airborne concentrations below 45 mg/m³ (OSHA PEL). Storage requires segregation from strong oxidizers (nitrates, peroxides) in corrosion-resistant containers. Bulk quantities are typically packaged in 25 kg polyethylene-lined fiber drums. Shelf life exceeds 2 years when protected from moisture and light exposure.
B2B Procurement Guide
Industrial buyers should specify technical (≥98%) or pharmaceutical (≥99.5%) purity grades. For adhesive formulations, low water content (<0.5%) is critical. Asian suppliers often offer competitive pricing but may require additional quality documentation. Just-in-time purchasing is advisable due to potential price volatility from benzene feedstock fluctuations. Consider multi-sourcing strategies given production concentration among few global players. Technical audits should verify ISO 9001 certification and batch traceability systems.
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