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[pwl]

During the production processes of Methylene diphenyl diisocyanate (MDI - all three isomers) - what are the inherent hazards one might need to consider to the detriment of the production plant's assets (I am not concerned about personnel safety matters - I understand the non benign nature of MDI)?

In other words what are the main corrosive / other effects due to the WHOLE production process on metallurgical / other assets (structure / tanks / piping etc)?

Are special alloys required during new build plant construction?

Are special Hazards involved - likelihood of explosion / corrosive leakages etc?

What should a Techical Integrity Assurance Manager look out for in particular during the construction of a new MDI plant?

Thank you for your consideration.

[Stepan]

MDI easily polymerizes if in contact with moisture. Obviously this is an exothermic reaction. Also will react with everything which has -OH or =NH, -NH2 or active -H. And quite toxic, also causes allergic sensitization.

[OC pro]

Moreover, phosgene is used to produce MDI. This is the most potent danger in the whole process.