Method for manufacturing aniline

Preparation of aniline comprises hydrogenating nitrobenzene in the presence of a catalyst to obtain a raw aniline; extracting the raw aniline with an aqueous alkali metal hydroxide solution and separating the aqueous phase (as lower phase) and organic phase, where: the concentration of the alkali me...

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Main Authors DUGAL, MARKUS, LAGO, ANDRE, GEHLEN, FRANZ-ULRICH, WERSHOFEN, STEFAN, BAECKER, WERNER, MAROTZ, BENIE, LEHNER, PETER, BRINKSCHULTE, HORST
Format Patent
LanguageEnglish
French
German
Published 26.03.2014
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:Preparation of aniline comprises hydrogenating nitrobenzene in the presence of a catalyst to obtain a raw aniline; extracting the raw aniline with an aqueous alkali metal hydroxide solution and separating the aqueous phase (as lower phase) and organic phase, where: the concentration of the alkali metal hydroxide solution and the temperature are adjusted during the extraction. Independent claims are included for: (1) a method for the preparation of di- and polyamine of the diphenyl methane series comprising preparing the aniline and reacting the aniline with formaldehyde in the presence of an acid catalyst; and (2) a method for the preparation of di- and polyisocyanate of the diphenyl methane series, comprising preparing the di- and polyamine and reacting the obtained di- and polyamine with the phosgene.
Bibliography:Application Number: EP20070075104