Continuous process for the hydrogenation of nitriles or...

Details Continuous process for the hydrogenation of nitriles or... Continuous process for the hydrogenation of nitriles or...

2003-01-20

2008-11-18

Davis, Brian J (Department: 1621)

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

Organic compounds

Amino nitrogen containing

C564S490000, C564S491000, C564S493000, C564S494000, C564S495000

Reexamination Certificate

active

07453012

ABSTRACT:
A process for the hydrogenation of compounds comprising nitrile or nitro functional groups to amine, aminonitrile or aminonitro compounds is provided. The process can be a continuous process conducted in the presence of a heterogeneous hydrogenation catalyst in divided form and a basic compound. The reaction can be conducted in a stirred reactor comprising an external loop for circulating the reaction mixture, allowing one portion of the hydrogenated products to be separated without withdrawing the catalyst, by using tangential filtration. The process may be especially useful in the hydrogenation of adiponitrile to an aminocapronitrile/hexamethylenediamine mixture.

REFERENCES:
patent: 6080372 (2000-06-01), Machado
patent: 6232488 (2001-05-01), Boschat et al.
patent: 6478968 (2002-11-01), Perrona et al.
patent: 6518449 (2003-02-01), Boschat et al.
International Search Report corresponding to PCT/FR 2003/00161, issued Jul. 30, 2003, 4 pages.

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