Overview
Aniline, also known as phenylamine, is a fundamental organic compound in the chemical industry. It is a primary aromatic amine, characterized by a benzene ring bonded to an amino group. Discovered in the early 19th century, aniline has become a cornerstone in the synthesis of various industrial and consumer products. Aniline is produced commercially through the catalytic hydrogenation of nitrobenzene or by the ammonolysis of phenol. Its versatility and reactivity make it a key intermediate in the manufacture of dyes, pharmaceuticals, and polymers. Despite its industrial importance, aniline requires careful handling due to its toxic and flammable nature.
Physical and Chemical Properties
Aniline is a colorless to slightly yellow liquid with a distinct, somewhat unpleasant odor. It has a density of 1.02 g/cm³ and a boiling point of 184.4°C. The compound is slightly soluble in water but mixes well with most organic solvents, including ethanol and ether. Chemically, aniline is a weak base, forming salts with strong acids. It undergoes various reactions, such as diazotization, which is crucial in dye manufacturing. Aniline is also susceptible to oxidation, leading to the formation of colored products. Its reactivity and solubility profile make it a valuable reagent in organic synthesis.
Main Applications
Aniline is predominantly used in the production of methylene diphenyl diisocyanate (MDI), a key component in polyurethane foams. These foams are widely employed in insulation, furniture, and automotive applications. Another significant use of aniline is in the dye industry, where it serves as a precursor for azo dyes and other colorants. Additionally, aniline derivatives are essential in pharmaceuticals, including the synthesis of paracetamol and sulfa drugs. The rubber industry also utilizes aniline as an antioxidant and vulcanization accelerator.
Safety and Storage
Aniline is toxic and poses health risks through inhalation, ingestion, or skin contact. Exposure can lead to methemoglobinemia, a condition that reduces the blood's oxygen-carrying capacity. Proper personal protective equipment (PPE), such as gloves and respirators, is mandatory when handling aniline. Storage should be in tightly sealed containers, placed in cool, dry, and well-ventilated areas away from heat sources. Spills must be contained and cleaned up immediately using appropriate absorbents. Compliance with local safety regulations is critical to minimize risks.
B2B Procurement Guide
When procuring aniline, B2B buyers should prioritize suppliers with certified quality standards, such as ISO or REACH compliance. Requesting material safety data sheets (MSDS) ensures transparency regarding handling and hazards. Price negotiations should consider bulk purchase discounts, but buyers must balance cost with purity requirements. Logistics planning is essential, given aniline's hazardous nature; ensure carriers are equipped to handle toxic substances. Establishing long-term supplier relationships can secure consistent quality and reliable delivery schedules.
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