Phosgene free route to methyl diphenyl diisocyanate (MDI)

H. Van Den Berg*, A. G J Van Der Ham, H. E. Gutierrez Murillo, S. O. Odu, T. Roelofs, A. J. De Weerdt

*Corresponding author for this work

Research output: Contribution to conferencePaper

Abstract

An alternative production process for MDI, in which no toxic phosgene is used, was designed. The plant should produce MDI at a rate of 300 kton/yr at market specifications and using methylelenedianiline (MDA) as a raw material, which has to be converted to MDI for at least 98%. Seven published routes were studied and compared on process conditions, technical and economical feasibility, and safety. Three routes remained, which all involved the reaction of MDA to a carbamate intermediate and the successive thermolysis of this intermediate to MDI and side-products. For these routes, a systematic design procedure was applied. The design for the promising route using urea and 3-methyl-1-butanol was completed. Heat integration studies showed that the savings for the process designed were limited to ∼ 4 Mw leading to 21 Mw hot utility and 90 Mw cold utility. This is an abstract of a paper presented at the CHISA 2012 - 20th International Congress of Chemical and Process Engineering and PRES 2012 - 15th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (Prague, Czech Republic 8/25-29/2012).

Conference

Conference20th International Congress of Chemical and Process Engineering, CHISA 2012 and 15th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2012
CountryCzech Republic
CityPrague
Period25/08/1229/08/12

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    Van Den Berg, H., Van Der Ham, A. G. J., Gutierrez Murillo, H. E., Odu, S. O., Roelofs, T., & De Weerdt, A. J. (2012). Phosgene free route to methyl diphenyl diisocyanate (MDI). Paper presented at 20th International Congress of Chemical and Process Engineering, CHISA 2012 and 15th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2012, Prague, Czech Republic.