Method of influencing the cis/trans isomer ratio of isophoronedi

Details Method of influencing the cis/trans isomer ratio of isophoronedi Method of influencing the cis/trans isomer ratio of isophoronedi

1994-12-22

1996-12-10

Burn, Brian M.

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

Organic compounds

Amino nitrogen containing

564448, 564455, C07C20922

Patent

active

055832601

ABSTRACT:
A method of controlling the cis/trans isomer ratio in the preparation of isophoronediamine by the aminating hydrogenation of isophoronenitrile in the presence of ammonia, H.sub.2 and a catalyst. The reaction takes place in two temperature steps, initially at 10.degree. to 90.degree. C. and then at above 90.degree. to 150.degree. C. with a temperature difference of at least 30.degree. C. between the two steps, the contact time being shorter in the first step than in the second. The cis/trans ratio is increased by lowering the temperature of the first step.

REFERENCES:
patent: 3352913 (1967-11-01), Schmitt et al.
patent: 4429157 (1984-01-01), Disteldorf et al.
patent: 5091554 (1992-02-01), Huthmacher et al.
auf der Heyde, W., et al., Die Angewandte Makromolekulare Chemie 153 (1987) 1-13, No. 2502.

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