The main feedstock for MDI is nitrobenzene which is produced by the nitration of benzene in either a continuous or batch process. The nitrobenzene is hydrogenated to aniline which is then condensed with formaldehyde to form diphenylmethane diamine. The reaction conditions in the condensation step control the composition of the polyamine product.
The polyamine is reacted with phosgene in a solvent such a monochlorobenzene to yield an isocyanate mix that largely corresponds to the composition of the polyamine. Pure MDI is distilled off under reduced pressure and shipped in molten or frozen form. The market split is roughly 80% polymeric and 20% pure MDI.
Methylene di-p-phenylene isocyanate
Price Reports
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Methylene di-p-phenylene isocyanate
Uses and Outlook
Methyl di-p-phenylene isocyanate (MDI) is mainly used in polyurethane foams, which account for about 80% of global consumption. Rigid foams are mostly used in construction, refrigeration, packaging and insulation. Flexible foams are used in furniture, bedding and transportation. MDI is also used to make elastomers, adhesives, sealants, coatings and plastics.
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