VERBESSERTES VERFAHREN ZUR HERSTELLUNG VON HEXAMETHYLENDIAMIN
    9.
    发明公开
    VERBESSERTES VERFAHREN ZUR HERSTELLUNG VON HEXAMETHYLENDIAMIN 有权
    改进工艺用于生产己二胺

    公开(公告)号:EP1107942A1

    公开(公告)日:2001-06-20

    申请号:EP99944417.7

    申请日:1999-08-17

    IPC分类号: C07C209/48 C07C211/12

    CPC分类号: C07C209/48 C07C211/12

    摘要: The invention relates to a method for the catalytic hydrogenation of adipodinitrile to hexamethylene diamine at a high temperature and at high pressure in the presence of catalysts based on elementary iron as the catalytic component, and ammonia as a solvent. The method is characterised in that a) adipodinitrile is hydrogenated at temperatures of 70 to 220 °C and at pressures of 100 to 400 bar in the presence of catalysts based on elementary iron as the catalytic component, and ammonia as a solvent to produce a mixture containing adipodinitrile, 6-aminocapronitrile, hexamethylene diamine and high boilers, until the sum of the 6-aminocapronitrile and adipodinitrile concentration is 1 to 50 wt. % in relation to the ammonia-free hydrogenation mixture; b) ammonia is separated out of the hydrogenation discharge; c) hexamethylene diamine is separated out of the remaining mixture; d) 6-aminocapronitrile and adipodinitrile are separated from the high boilers together or separately and e) 6-aminocapronitrile, adipodinitrile or their mixtures are returned to step a).