Process for preparing high-purity aniline

Details Process for preparing high-purity aniline Process for preparing high-purity aniline

1991-09-17

1997-04-01

Burn, Brian M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C07C20922

Patent

active

056168063

ABSTRACT:
A process for the continuous preparation of aniline by hydrogenating nitrobenzene with hydrogen is disclosed which comprises the steps of suspending, in an aniline solvent, a catalyst of palladium or palladium-platinum which is deposited on a lipophilic carbon having an oil absorbency of at least 100, and carrying out reaction at a temperature of from 150.degree. to 250.degree. C. substantially in the absence of water while aniline and water formed in said reaction are continuously distilled off as vapor from the reaction product, and the concentration of nitrobenzene in the reaction solution is maintained at 0.01% by weight or less, wherein a zinc compound is added to the reaction system as a promotor and carbon monoxide is added to the hydrogen at a concentration of 1-500 ppm.

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patent: 4772750 (1988-09-01), Habermann
patent: 4990663 (1991-02-01), Chang et al.
Hackh's Chemical Dictionary, 3d. Ed. (1948) p. 686.

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