| 摘要 |
A process for the modification of a hydrogenation catalyst of the Raney nickel, Raney cobalt, nickel-on-carrier or cobalt-on-carrier type comprises treating the hydrogenation catalyst at temperatures of about 0.degree.C to about 120.degree.C with carb on monoxide, carbon dioxide, formaldehyde, a lower aliphatic aldehyde, an aromatic aldehyde, an aliphatic ketone, an aromatic ketone, a mixed aliphatic/aromatic ketone, glyoxal, pyruvaldehyde o r glyoxylic acid as the modification agent in a liquid dispersion medium consisting of water or an organic solvent for a duration of about 15 minutes to about 24 hours. As a consequen ce of the process, when the thus-modified catalyst is used in the hydrogenation of a nitrite to the corresponding amine the selectivity is increased, whereby the increased selectivity favours significantly the amount of the primary amine vis-à-vis the undesired secondary amine in the hydrogenation product compared with the case when the corresponding unmodifi ed catalyst is employed. The present invention concerns in a second aspect the process f or the hydrogenation of a nitrite to the corresponding primary amine using a thus- modified catalyst.
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