Process for continuous hydrogenation of adiponitrile

Details Process for continuous hydrogenation of adiponitrile Process for continuous hydrogenation of adiponitrile

1998-03-26

1999-05-04

Burn, Brian M.

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

Organic compounds

Amino nitrogen containing

C07C20948

Patent

active

059005114

ABSTRACT:
A process for continuous hydrogenation of adiponitrile (ADN) to hexamethylene diamine (HMD) and optionally to amninocapronitrile (ACN) involving the catalytic hydrogenation of adiponitrile at relatively low temperature (e.g., 75.degree. C.) and pressure (e.g., 500 psig) using a sponge cobalt catalyst (Raney.RTM. Co) in a reaction medium that is substantially free of caustic. In such a process periodic addition of water controls the production of side reaction products and the periodic addition of ammonium hydroxide rejuvenates the catalyst. Hexamethylene diamine is an important intermediate for the synthesis of polyamides such as Nylon-6,6 and aminocapronitrile is a potential intermediate of Nylon-6.

REFERENCES:
patent: 5750788 (1998-05-01), Haussling et al.

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