PROCESS TO INCREASE THE FRACTION OF TRANS-ISOMERS OF A DI-AMINO-COMPOUND

    公开(公告)号:EP3546445A1

    公开(公告)日:2019-10-02

    申请号:EP19163730.5

    申请日:2019-03-19

    申请人: BASF SE

    IPC分类号: C07C209/86 C07C211/36

    摘要: A process to increase the fraction of trans-isomers of a di-amino-compound selected from 2,4-diamino-1-methylcyclohexane, 2,6-diamino-1-methylcyclohexane or mixtures thereof, and comprising trans-isomers having the two amino groups of the di-amino compound in trans position to the cyclohexane ring as well as cis-isomers having the two amino groups in cis position to the cyclohexane ring wherein a solution comprising the di-amino-compound and an auxiliary compound with at least one hydroxy group having a molecular weight of at maximum 1000 g/mol is prepared, the temperature of the solution is decreased until a suspension comprising crystals is obtained, the crystals are separated from the suspension, and a liquid comprising a trans-enriched di-amino-compound with an increased fraction of trans-isomers is obtained.