Process for the production of aromatic amines
AssigneeBayer Aktiengesellschaft
InventorsReinhard Langer, Hans-Josef Buysch, Ursula Pentling, Paul Wagner
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Abstract
Aromatic amines are produced by hydrogenation of the appropriate aromatic nitro compounds in the vapour phase on fixed catalysts. The catalysts contain supported metals active in hydrogenation, the reaction is carried out under adiabatic conditions at a pressure of from 1 to 30 bar, an inlet temperature of from 200.degree. to 400.degree. C. and a maximum catalyst temperature of 500.degree. C.
Claims31
A process for the production of an aromatic amine represented by the formula ##STR4## in which R.sup.1 represents hydrogen, a methyl group, an ethyl group or an amino group, and
- R.sup.2 represents hydrogen, a methyl group or an ethyl group
- comprising hydrogenating an aromatic nitro compound represented by the formula ##STR5## in which R.sup.2 represents hydrogen, a methyl group or an ethyl group, and
- R.sup.3 represents hydrogen, a methyl group, an ethyl group or a nitro group
- with hydrogen on a fixed catalyst under adiabatic conditions at a pressure of from 1 to 30 bar in which the nitro compound and hydrogen are introduced into a reaction vessel at a temperature of from about 200.degree. to about 400.degree. C. and the maximum catalyst temperature is 500.degree. C.
A process for the production of aniline comprising hydrogenating nitrobenzene with hydrogen on a fixed palladium catalyst on a carbon support under adiabatic conditions at a pressure of from about 5 to about 5.5 bar in which the nitrobenzene and hydrogen are introduced into a reaction vessel at a temperature of from about 200.degree. to about 220.degree. C. and the maximum catalyst temperature is 500.degree. C.
Dependencies are inferred from the claim text.