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This report presents the economics of Methylene Diphenyl Diisocyanate (MDI) production from aniline and formaldehyde using a typical oxidative carbonylation process located in the USA. In this process, aniline undergoes oxidative carbonylation to give ethyl phenylcarbamate (EPC). Then, the EPC reacts with formaldehyde to form diphenylene diurethane (MDU). Finally, MDU is thermally decomposed to MDI.
This study presents the costs associated with the construction of a plant producing MDI from aniline and formaldehyde in the USA. In this study aniline reacts with formaldehyde to form a mixture of diphenyl methane diamine and polymeric amines. Then, this mixture reacts with phosgene to produce MDI and polymeric MDI. The phosgene used is generated from chlorine in an on-site unit.