Overview
Adiponitrile is a critical intermediate in the chemical industry, primarily serving as the precursor for hexamethylenediamine (HMDA), which is polymerized with adipic acid to produce nylon 6,6. First commercially produced in the 1930s, modern production methods include catalytic hydrocyanation of butadiene and electrochemical dimerization of acrylonitrile. Global production exceeds 1 million tons annually, with major facilities located in the US, Europe, and China. The material's importance stems from its role in manufacturing high-performance polyamides used in automotive components, textiles, and industrial fibers.
Physical and Chemical Properties
As a dinitrile compound, adiponitrile exhibits typical nitrile reactivity including hydrolysis to carboxylic acids and hydrogenation to amines. Its relatively high boiling point (295°C) makes it suitable for high-temperature processes. The liquid has low viscosity (3.5 cP at 20°C) and shows Newtonian flow characteristics. Chemically, ADN undergoes hydrogenation over cobalt or ruthenium catalysts to produce HMDA. It's stable under normal conditions but may decompose at high temperatures to release hydrogen cyanide. The compound's flash point is 163°C (closed cup), requiring careful handling to prevent fire hazards.
Main Applications
Approximately 90% of global adiponitrile production is converted to HMDA for nylon 6,6 synthesis. This engineering plastic appears in airbags (25% of automotive usage), tire cords (35%), and industrial fibers (20%). Smaller applications include electroplating bath additives and specialty chemical synthesis. Emerging uses include lithium battery electrolytes where ADN serves as a co-solvent to improve electrolyte stability. Recent R&D explores its potential in pharmaceutical intermediates and corrosion inhibitors, though these remain niche applications compared to polymer production.
Safety and Storage
Adiponitrile requires strict safety protocols due to its LD50 of 300 mg/kg (oral, rat) and potential cyanide release during decomposition. OSHA's permissible exposure limit is 2 ppm (skin). Storage tanks should be nitrogen-blanketed and constructed from carbon steel or stainless steel 304/316. Emergency measures include vapor suppression foam for spills and positive-pressure breathing apparatus for responders. The chemical is classified as Acute Toxicity 3 (oral) under GHS and requires proper hazard labeling during transportation (UN 2205).
B2B Procurement Guide
Industrial buyers should evaluate suppliers based on: 1) Production capacity (minimum 50,000 MT/year for stable supply) 2) Purity specifications (>99.5% for nylon grade) 3) Logistics capabilities (ISO tank containers preferred for bulk shipments). Quality testing should include GC analysis for impurity profiling (particularly mono- and trinitriles) and moisture content (<0.1%). Contract terms typically include price adjustment clauses linked to butadiene feedstock costs. Consider regional production for tariff advantages in nylon manufacturing clusters.