| abstract |
ThenThe invention relates to a process for the preparation of aromaticnAmines by hydrogenation of nitroaromatics in the presence of catalysts,nwherein in a reactor, a fluid, amine-containing reaction mixturenarises, from which the catalysts are separated. After thisnSeparation of the catalysts is a measurement for the absorption ofnUV / VIS radiation through the reaction mixture for concentration determinationnof nitro and nitroso compounds in the reaction mixture. |