Aniline

Aniline

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Aniline (C₆H₅NH₂) is a colorless to slightly brown oily liquid with a distinct aromatic odor. It is the simplest aromatic amine, composed of a benzene ring attached to an amino group. Aniline is a crucial intermediate in the chemical industry, particularly for the production of dyes, pigments, pharmaceuticals, rubber-processing chemicals, and polyurethane foams.

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Chemical and Physical Properties of Aniline
  • Chemical formula: C₆H₅NH₂
  • Molar mass: 93.13 g/mol
  • Appearance: Colorless to pale brown liquid (darkens on exposure to air and light)
  • Density: 1.0217 g/cm³ at 20 °C
  • Melting point: -6.3 °C
  • Boiling point: 184.1 °C
  • Solubility: Slightly soluble in water (3.6 g/L at 20 °C); miscible with organic solvents such as ethanol, ether, and benzene
These characteristics make aniline versatile in industrial synthesis, though its handling requires care due to its toxic and potentially carcinogenic nature.   Industrial Applications of Aniline Aniline is one of the most important feedstocks in the chemical industry, with applications in multiple downstream products:
  • Polyurethane Industry
  • Over 85% of global aniline production is used to manufacture methylene diphenyl diisocyanate (MDI), a key component in rigid and flexible polyurethane foams used in insulation, automotive seating, furniture, and construction.
 
  • Dye and Pigment Manufacturing
  • Aniline was historically the first compound used to synthesize synthetic dyes. Today, it remains a core raw material for producing azo dyes, indigo dye (used in denim), and rubber-processing chemicals.
 
  • Pharmaceuticals and Agrochemicals
  • Aniline is used in the synthesis of active pharmaceutical ingredients (APIs) such as paracetamol (acetaminophen).
  • It also serves as a building block in herbicides, fungicides, and crop-protection chemicals.
 
  • Other Applications
  • Antioxidants, photographic chemicals, explosives (e.g., Tetryl), and accelerators in the rubber industry.
  Global Market Overview
  • Production Capacity: The global aniline production exceeded 6.5 million metric tons in 2023, with Asia-Pacific (China and India) being the dominant producer and consumer.
  • Market Growth: The aniline market is projected to grow at a CAGR of ~5% from 2024 to 2030, driven mainly by the expansion of the construction, automotive, and insulation sectors.
  • Key Producers: BASF, Covestro, Huntsman Corporation, Wanhua Chemical, and SABIC are among the leading global suppliers.
  Safety and Handling
  • Aniline is classified as toxic by inhalation, ingestion, or skin absorption and may cause methemoglobinemia.
  • Proper personal protective equipment (PPE), ventilation, and secure storage in stainless steel or dark glass containers are essential.
  • It should be kept away from direct sunlight and oxidizing agents to prevent decomposition.

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