Overview
Nitrophenol is an aromatic organic compound featuring a hydroxyl group and a nitro group attached to a benzene ring. It exists in three isomeric forms (ortho-, meta-, and para-), with para-nitrophenol (PNP) being the most commercially significant. The compound was first synthesized in the mid-19th century during early studies of nitroaromatic compounds. As an important chemical intermediate, nitrophenol serves as a building block for more complex molecules in various industries. Its derivatives find applications ranging from dyes and pigments to pharmaceuticals and agrochemicals. The global market for nitrophenol is steadily growing, particularly in Asia where chemical manufacturing is expanding rapidly.
Physical and Chemical Properties
Nitrophenol appears as yellow crystalline solid with a characteristic phenolic odor. The para-isomer is the most stable form, exhibiting higher melting point and lower solubility in water compared to the ortho- and meta- forms. The compound shows typical aromatic and phenolic reactions, including electrophilic substitution and salt formation. A notable chemical property is its weak acidity (pKa ≈ 7.15), making it more acidic than phenol but less acidic than mineral acids. The nitro group strongly withdraws electrons from the aromatic ring, enhancing the acidity of the hydroxyl group. This electron-withdrawing effect also makes the compound relatively resistant to oxidation but susceptible to reduction reactions.
Main Applications
In the dye industry, nitrophenol serves as a precursor for azo dyes and other colorants, particularly yellow and orange shades. The pharmaceutical sector utilizes it in synthesizing paracetamol (acetaminophen) and various analgesics. Agricultural applications include its use in manufacturing certain pesticides and herbicides. The chemical is also employed as a pH indicator (yellow in acidic solutions, colorless in basic) and in organic synthesis as a protecting group or intermediate. Recent research explores its potential in polymer chemistry and as a building block for more complex nitroaromatic compounds with specialized applications.
Safety and Storage
Nitrophenol requires careful handling due to its toxic nature. It can cause skin irritation, eye damage, and respiratory problems upon exposure. Appropriate personal protective equipment (gloves, goggles, respirator) should be used when handling the chemical. The compound may form explosive salts with strong bases like sodium hydroxide. For storage, keep containers tightly sealed in a cool, well-ventilated area away from incompatible substances (strong oxidizers, bases). Store in original containers or approved chemical-resistant packaging. Secondary containment is recommended to prevent environmental contamination in case of spills. Shelf life is typically 2-3 years when stored properly.
B2B Procurement Guide
When sourcing nitrophenol, purity is a critical factor - industrial grade typically requires ≥98% purity, while pharmaceutical applications may demand ≥99%. Verify certificates of analysis and request safety data sheets (SDS) from suppliers. Bulk quantities (drum or tonnage) offer better pricing but require proper transportation arrangements. Consider suppliers' production capacity, quality control processes, and regulatory compliance. Asian manufacturers often offer competitive pricing, while European suppliers may provide higher purity grades. Payment terms commonly range from 30% advance to LC at sight. Lead times vary from 2-6 weeks depending on quantity and location. Always confirm packaging meets international hazardous material transport regulations.
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