Synthesis
There are five steps to the synthesis of pure IPDI:
- Condensation: Conversion of acetone with a catalyst to produce isophorone
- Hydrocyanation: Reaction of the isophorone with hydrogen cyanide to form isophorone nitrile
- Reductive amination: Reaction of the isophorone nitrile with ammonia, hydrogen and a catalyst, to form a mixture of isophorone diamine conformers (25/75 cis/trans)
- Phosgenation: Reaction of the isophorone diamine with phosgene to form a crude mixture containing IPDI conformers (25/75 cis/trans)
- Purification: Distillation of the crude IPDI to extract pure IPDI
Read more about this topic: Isophorone Diisocyanate
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