Abstract: The present invention relates to a process for continuous hydrogenation of a nitro compound to the corresponding amine in a liquid reaction mixture comprising the nitro compound in a reaction chamber in the presence of a supported catalyst which comprises as the active component at least one element from groups 7 to 12 of the periodic table of the elements, wherein ammonia is added to the reaction chamber during the hydrogenation.

Abstract: The present invention relates to a process for continuous hydrogenation of a nitro compound to the corresponding amine in a liquid reaction mixture comprising the nitro compound in a reaction chamber in the presence of a supported catalyst which comprises as the active component at least one element from groups 7 to 12 of the periodic table of the elements, wherein ammonia is added to the reaction chamber during the hydrogenation.

Abstract: Process for hydrogenating toluenediamine (TDA) tar containing TDA and high boilers relative to TDA, including the step of contacting the toluenediamine tar with a heterogeneous hydrogenation catalyst comprising at least one metal selected from the group consisting of Ni, Co, Ru, Pd, Pt on at least one catalyst support selected from the group consisting of carbon, TiO2 and ZrO2, and with hydrogen under hydrogenating conditions.

Abstract: The present invention relates to a process for continuous hydrogenation of a nitro compound to the corresponding amine in a liquid reaction mixture comprising the nitro compound in the presence of a supported catalyst which comprises as the active component at least one element from groups 7 to 12 of the periodic table of the elements, wherein the hydrogenation is performed in the presence of at least one salt selected from the group consisting of the salts of the alkali metals, alkaline earth metals and of the rare earth metals and to a supported catalyst for continuous hydrogenation of a nitro compound to the corresponding amine in a liquid reaction mixture comprising the nitro compound which comprises as the active component at least one element from groups 7 to 12 of the periodic table of the elements and one salt of the alkali metals, alkaline earth metals or of the rare earth metals.

Abstract: Process for hydrogenating toluenediamine (TDA) tar containing TDA and high boilers relative to TDA, including the step of contacting the toluenediamine tar with a heterogeneous hydrogenation catalyst comprising at least one metal selected from the group consisting of Ni, Co, Ru, Pd, Pt on at least one catalyst support selected from the group consisting of carbon, TiO2 and ZrO2, and with hydrogen under hydrogenating conditions.

Abstract: The present invention relates to a process for continuous hydrogenation of a nitro compound to the corresponding amine in a liquid reaction mixture comprising the nitro compound in the presence of a supported catalyst which comprises as the active component at least one element from groups 7 to 12 of the periodic table of the elements, wherein the hydrogenation is performed in the presence of at least one salt selected from the group consisting of the salts of the alkali metals, alkaline earth metals and of the rare earth metals and to a supported catalyst for continuous hydrogenation of a nitro compound to the corresponding amine in a liquid reaction mixture comprising the nitro compound which comprises as the active component at least one element from groups 7 to 12 of the periodic table of the elements and one salt of the alkali metals, alkaline earth metals or of the rare earth metals.

Abstract: The present invention relates to a catalyst for dehydroaromatizing C1-C4-aliphatics, said catalyst being obtainable by twice treating a zeolite from the group of MFI and MWW with NH4-containing mixtures, in each case with subsequent drying and calcination. The catalyst comprises molybdenum and, if appropriate, as further elements, Cu, Ni, Fe, Co, Mn, Cr, Nb, Ta, Zr, V, Zn and/or Ga. The present invention further provides a process for dehydroaromatizing a mixture comprising C1-C4-aliphatics by conversion in the presence of the catalyst.

Abstract: The present invention relates to a catalyst for dehydroaromatizing C1-C4-aliphatics, said catalyst being obtainable by twice treating a zeolite from the group of MFI and MWW with NH4-containing mixtures, in each case with subsequent drying and calcination. The catalyst comprises molybdenum and, if appropriate, as further elements, Cu, Ni, Fe, Co, Mn, Cr, Nb, Ta, Zr, V, Zn and/or Ga. The present invention further provides a process for dehydroaromatizing a mixture comprising C1-C4-aliphatics by conversion in the presence of the catalyst.