Overview
Aniline, also known as aminobenzene or phenylamine, is an organic compound with the formula C6H5NH2. It is the simplest aromatic amine and a key intermediate in the chemical industry. Aniline is produced on a large scale and is primarily used in the manufacture of polyurethane, dyes, and pharmaceuticals. The compound was first discovered in the early 19th century and has since become a cornerstone of industrial chemistry. Its versatility and reactivity make it indispensable in various chemical syntheses, particularly in the production of methylene diphenyl diisocyanate (MDI), a precursor to polyurethane foams.
Physical and Chemical Properties
Aniline is a colorless to pale 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, ether, and benzene. Chemically, aniline is a weak base and reacts with acids to form salts. It is also highly reactive in electrophilic aromatic substitution reactions, making it a valuable building block for more complex molecules. However, aniline is toxic and flammable, requiring careful handling to avoid health risks and fire hazards.
Main Applications
Aniline is predominantly used in the production of polyurethane, where it serves as a precursor to methylene diphenyl diisocyanate (MDI). MDI is a critical component in the manufacture of flexible and rigid foams, adhesives, and coatings. Additionally, aniline is a key raw material in the dye industry, particularly for producing synthetic dyes like indigo and azo dyes. It is also used in the pharmaceutical sector to synthesize drugs such as paracetamol and sulfa drugs. Other applications include rubber processing chemicals, herbicides, and explosives.
Safety and Storage
Aniline poses significant health risks, including toxicity through inhalation, ingestion, or skin contact. Exposure can lead to methemoglobinemia, a condition that reduces the blood's ability to carry oxygen. Proper personal protective equipment (PPE), such as gloves and respirators, is essential when handling this chemical. Storage of aniline requires a cool, dry, well-ventilated area away from heat sources and open flames. Containers should be tightly sealed to prevent leakage and contamination. Spills should be contained immediately using absorbent materials, and contaminated areas should be cleaned thoroughly to avoid environmental damage.
B2B Procurement Guide
When procuring aniline, B2B buyers should prioritize suppliers with a proven track record of compliance with safety and environmental regulations. Verify that the supplier provides Material Safety Data Sheets (MSDS) and proper handling instructions. Quality control is critical; ensure the aniline meets industry standards, such as purity levels above 99.5%. Bulk purchases may offer cost advantages, but storage capacity and shelf life should be considered. Additionally, logistics planning is essential due to the chemical's hazardous nature, requiring specialized transportation and handling.
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