US 12,616,960 B2 · Catalyst system for producing aromatic amines

Abstract

The invention relates to a catalyst system suitable for hydrogenating aromatic nitro compounds (I) to form the corresponding aromatic amines (II), the catalyst system containing, as essential constituents: a component A selected from the group consisting of silicon carbide, corundum (alpha-Al2O3) and slightly porous to non-porous zirconium oxide (ZrO2); and a component B, containing B1—a carrier substance selected from the group consisting of silicon dioxide, gamma-, delta- or theta-aluminum oxide Al2O3, titanium dioxide, zirconium dioxide and graphite, B2—a metal or a plurality of metals selected from the group consisting of copper, nickel, palladium, platinum and cobalt, and optionally B3—an additional metal selected from the group consisting of at least one metal selected from main group I, main group II, main group IV and sub-groups II, V, VI and VIII of the periodic table of the elements, the proportion of component A being in the range of 5 to 60 wt %, in relation to the total weight of the catalyst system, and the aromatic nitro compounds (I) being those of the general formula R—(NO2)n, (I), and the aromatic amines (II) being those of the general formula R—(NH2)n, (II), and the moieties R and indices n in formulas (I) and (II) having the following meaning: R is a substituted or unsubstituted aromatic C6-C10 moiety and n is an integer from 1 to 5.

Claims6

Dependent claims

A catalyst system suitable for the hydrogenation of aromatic nitro compounds (I) to the corresponding aromatic amines (II), comprising as essential constituents

a component A silicon carbide, wherein component A is a constituent of component B1 and
a component B comprising
B1 a support material selected from the group consisting of silica, gamma-, delta- or theta-alumina Al2O3, titanium dioxide, zirconium dioxide, and graphite and
B2 copper,
wherein a cumulative content of the metals in component B2, calculated in elemental form, based on the total mass of the catalyst system is from 5% to 30%, and
optionally B3 a further metal selected from the group consisting of at least one metal selected from main group I, main group II, main group IV, and subgroups II, V, VI, and VIII of the periodic table of the elements,
wherein component A is within a range from 15% to 35% by weight based on the total weight of the catalyst system and
where the aromatic nitro compounds (I) are those of the general formula R—(NO2)n (I), the aromatic amines (II) are those of the general formula R—(NO2)n (II), and the radicals R and indices n in formulas (I) and (II) are defined as follows:
R is a substituted or unsubstituted aromatic C6 to C10 radical and n is an integer from 1 to 5
wherein the support material B1 has an average pore volume in the range from 0.6 ml/g to 1.3 ml/g, measured according to DIN 66133.

7 more elements

Dependencies are inferred from the claim text.

Catalyst system for producing aromatic amines

Life of this patent

Catalyst system for producing aromatic amines

Life of this patent

Abstract

Claims6