Interaction | Reaction | Process     Data Page

Toluene is converted to TDI using several steps.

First, toluene is nitrated to a mixture of the 2,4- and 2,6-dinitrotoluenes with nitric/sulfuric acid mixture. The dinitrotoluenes are reduced to the corresponding amines by catalytic hydrogenation (Raney Ni, 100°C, 50 bar). Finally, the amines are converted to converted into the isocyanate with phosgene. Many process variations are employed.

Industrial Organic Chemistry, 3rd. Ed. K. Weissermel, H.-J. Arpe, VCH (1997)
  +  
HNO3|H2SO4
concentrated
  +  
H2
  +  
         
Reactant Page Go To Go To
Toluene     Reactions Using    Reactions Forming
Nitrating mixture     Reactions Using    Reactions Forming
Hydrogen     Reactions Using    Reactions Forming
Phosgene     Reactions Using    Reactions Forming
Toluene diisocyanate     Reactions Using    Reactions Forming

Interaction, Reaction, Process defined as:
Elimination: First Order
Hydrogenation, catalytic
Industrial Process: Organic
Substitution: Electrophilic Aromatic
Substitution: Nucleophilic Second Order

© Mark R. Leach 1999 –

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