Process for producing trans 1,4-bis(aminomethyl)cyclohexane

Details Process for producing trans 1,4-bis(aminomethyl)cyclohexane Process for producing trans 1,4-bis(aminomethyl)cyclohexane

1998-02-26

1999-10-19

Burn, Brian M.

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

Organic compounds

Amino nitrogen containing

C07C20988

Patent

active

059691875

ABSTRACT:
Provided a process for producing higher content of trans 1,4-bis(aminomethyl)cyclohexane which is used as the raw material for producing polyamides or polyurethanes having physically and chemically excellent properties from 1,4-bis(aminomethyl)cyclohexane which is generally produced by hydrogenation of p-xylylenediamine.
That is, a mixture of cis and trans 1,4-bis(aminomethyl)cyclohexane is isomerized by heating at 120 to 250.degree. C. in the presence of a platinum group catalyst to change to trans isomer. 1,4-bis(aminomethyl)cyclohexane containing more than 80% trans isomer is produced by combining this isomerization technique and crystallization technique.

REFERENCES:
patent: 3767707 (1973-10-01), Cleary
patent: 4058563 (1977-11-01), Richter
I. Hashimoto et al., Yuuki Gosei Kagaku, 25(2), 46-49 (1967).

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