Method for the production of isophorondiamine (ipda,...

Details Method for the production of isophorondiamine (ipda,... Method for the production of isophorondiamine (ipda,...

2007-08-14

2007-08-14

Davis, Brian (Department: 1621)

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

Organic compounds

Amino nitrogen containing

C564S302000, C564S303000, C564S444000

Reexamination Certificate

active

10522994

ABSTRACT:
The invention relates to processes for preparing 3-aminomethyl-3,5,5-trimethylcyclo-hexylamine (isophoronediamine, IPDA) having a high cis/trans isomer ratio. IPDA having a cis/trans isomer ratio in the range from 63/37 to 66/34 can be obtained in any desired cis/trans isomer ratio, irrespective of temperature, by reacting IPDA with H2and NH3in the presence of a hydrogenation catalyst. IPDA having a cis/trans isomer ratio of at least 73/27 which is an important starting material for the synthesis of polyurethanes and polyamides can be obtained by combining this isomerization process with distillative processes.

REFERENCES:
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patent: 6022999 (2000-02-01), Voit et al.
patent: 2004/0225156 (2004-11-01), Funke et al.
patent: 4211454 (1992-06-01), None

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