VERFAHREN ZUR KONTINUIERLICHEN HERSTELLUNG VON POLYAMID-GRANULAT
    17.
    发明公开
    VERFAHREN ZUR KONTINUIERLICHEN HERSTELLUNG VON POLYAMID-GRANULAT 审中-公开
    PROCESS尼龙冲剂连续生产

    公开(公告)号:EP2046863A2

    公开(公告)日:2009-04-15

    申请号:EP07724885.4

    申请日:2007-05-04

    发明人: SCHMIDT Gerhard

    摘要: The invention relates to a continuous method for production of polyamide granules, comprising a hydrolytic polymerisation of a mixture of at least one lactam and water to give a low-viscosity polyamide melt at a pressure of at least 5 bar and granulation of the low-viscosity polyamide melt by direct droplet formation with maintenance of a pressure which corresponds to at least the vapour pressure of the water retained in the polyamide melt. The low-viscosity granules thus obtained can be condensed in a single-stage subsequent step by treatment with super-heated steam to give a higher viscosity and unreacted monomers and cyclic oligomers extracted and then dried. The invention is characterised by gentle conditions with reduced residence time and temperatures.