Abstract
Isocyanates are industrially produced using strong mineral acids (e.g. HCl), in the condensation of aniline to produce methylenedianiline (MDA), and phosgene, in the conversion of MDA to the corresponding isocyanates. Huge quantities of sodium chloride, contaminated with organic compounds, are produced during process, and their disposal is a relevant issue.
New processes during the last 20 years have been studied in order to avoid the use of both HCl and phosgene obtaining the production of methylene diphenyl diisocyanate (MDI) and toluene diisocyanate (TDI), completely chlorine-free.
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de Angelis, A., Bosetti, A., Millini, R., Perego, C. (2016). Catalytic Processes for Environmentally Friendly Methylene Diphenyl Diisocyanate Production. In: Tundo, P., He, LN., Lokteva, E., Mota, C. (eds) Chemistry Beyond Chlorine. Springer, Cham. https://doi.org/10.1007/978-3-319-30073-3_5
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