Verfahren zur Herstellung von Di-und Polyaminen der Diphenylmethanreihe

摘要

Preparation of di- and polyamine of diphenylmethane comprises reacting nitrobenzene and methanol in presence of a catalyst to give aniline, formaldehyde and carbon monoxide; reacting the aniline and formaldehyde in the presence of an acid catalyst to give di- and polyamine of diphenylmethane; and reacting the carbon monoxide with chlorine to form phosgene. An independent claim is included for the preparation of di- and polyisocyanate of diphenylmethane comprising the steps involved in the preparation of di- and polyamine of diphenylmethane followed by phosgenating the obtained di- and polyamine of diphenylmethane.