Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
2006-06-13
2006-06-13
Davis, Brian (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
C564S448000, C502S213000
Reexamination Certificate
active
07060857
ABSTRACT:
In a process for preparing 3-aminomethyl-3,5,5-trimethylcyclohexylamine (isophoronediamine, IPDA) having a cis/trans isomer ratio of at least 70/30 from 3-cyano-3,5,5-trimethylcyclohexanone (isophoronenitrile, IPN), NH3and H2, the hydrogenation is carried out at from 50 to 200° C. and a pressure of from 50 to 300 bar in the presence of a hydrogenation catalyst having an alkali metal content of ≦0.03% by weight, calculated as alkali metal oxide referring to the total weight of the catalyst.The alkali metal content is made up of the contents of Li, Na, K, Rb and Cs; in particular, the alkali metal content is the Na content.A process for producing hydrogenation catalysts having an alkali metal content (in particular a sodium content) of ≦0.03% by weight, calculated as alkali metal oxide/sodium oxide referring to the total weight of the catalyst, and the hydrogenation catalysts themselves are also provided by the invention.
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Funke Frank
Henkes Erhard
Hill Thomas
Himmel Walter
Körner Reinhard
BASF - Aktiengesellschaft
Davis Brian
Novak Druce & Quigg LLP
Voight Jason D.
LandOfFree
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