Overview
Resorcinol (1,3-benzenediol) is a dihydroxy derivative of benzene with two hydroxyl groups in the meta position. It is synthesized industrially by sulfonation of benzene followed by alkaline fusion. The compound exhibits both phenolic and aromatic properties, making it versatile for chemical synthesis. As a key intermediate, resorcinol is widely used in the production of adhesives, pharmaceuticals, and specialty chemicals. Its ability to form strong bonds with formaldehyde is exploited in wood adhesives, while its UV-absorbing properties make it valuable in sunscreen formulations.
Physical and Chemical Properties
Resorcinol appears as white needles or crystalline powder with a faint phenolic odor. It is hygroscopic and readily soluble in polar solvents. The compound undergoes typical phenol reactions, including electrophilic substitution and oxidation. Notably, resorcinol forms colored complexes with ferric chloride (violet) and reduces Fehling’s solution, distinguishing it from other isomers. Its pKa values (9.15 and 11.06) reflect moderate acidity, enabling salt formation with bases. Thermal decomposition occurs above 276°C, releasing carbon monoxide and other hazardous byproducts.
Main Applications
Over 50% of global resorcinol production is used in rubber adhesives for tires and automotive belts, where it enhances bonding between rubber and reinforcing materials like steel or polyester. In medicine, it serves as an antiseptic (e.g., in acne treatments) and precursor to drugs such as the thyroid hormone thyroxine. The compound is also critical in UV stabilizers for plastics and hair dye formulations, where it couples with diazonium salts to produce azo dyes. Emerging applications include flame retardants and electrochemical sensors due to its redox activity.
Safety and Storage
Resorcinol is classified as harmful (H302, H312, H315) and requires handling with nitrile gloves, goggles, and fume hoods. Prolonged skin contact may cause dermatitis or hypothyroidism. Spills should be neutralized with sodium carbonate and absorbed in inert material. Store in airtight containers away from oxidizers (e.g., peroxides) and heat sources. Shelf life exceeds two years when kept below 30°C with desiccants. Transport as per UN 2876 (Class 6.1) with proper hazard labeling.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification and batch-wise COA (Certificate of Analysis). Technical-grade (99% purity) is standard for adhesives, while pharmaceutical-grade (99.5%+) commands a 20–30% premium. Bulk shipments (20-ton containers) reduce costs by 10–15% compared to bagged quantities. Key quality tests include melting point range (109–112°C) and spectrophotometric purity. Audit suppliers for benzene residue (<1 ppm) and heavy metal compliance (USP/EP standards).
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