Continuous process for the hydrogenation of nitriles or nitro compounds to amines
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United States of America Patent
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Nov 18, 2008
Grant Date -
May 24, 2007
app pub date -
Jan 20, 2003
filing date -
Jan 21, 2002
priority date (Note) -
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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.
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