The Production Situation and Research Progress of MDI

Diphenylmethane diisocyanate(MDI) was one of the high value-added products chlorine consumption in chlor-alkali industry,and was a kind of important synthetic organic materials.The production situation and needs of MDI were introduced,which can be synthesized by the amine phosgene method,reductive carbonylation of nitrobenzene method,and dimethyl carbonate methods.The advantages and disadvantages of different production processes of the toluene diisocyanate,and the development prospects of it were described briefly,and the future research were discussed.