KONTINUIERLICHES VERFAHREN ZUR MEHRSTUFIGEN TROCKNUNG UND NACHKONDENSATION VON POLYAMIDGRANULAT
    5.
    发明授权
    KONTINUIERLICHES VERFAHREN ZUR MEHRSTUFIGEN TROCKNUNG UND NACHKONDENSATION VON POLYAMIDGRANULAT 有权
    多级干燥连续法和冷凝聚酰胺GRANULAT的

    公开(公告)号:EP2297228B1

    公开(公告)日:2012-01-04

    申请号:EP09765919.7

    申请日:2009-06-19

    Applicant: BASF SE

    CPC classification number: C08G69/46 C08G69/16

    Abstract: A continuous method for multi-staged drying and subsequent condensation of solid phase polyamide granulate is characterized in that 1) the pre-drying is carried out in a continuous drying apparatus operated in counter-flow or cross-flow mode with inert gas, steam or a mixture of inert gas and steam at a granulate temperature in the range of 70 to 200°C and 2) the subsequent continuous post-condensation is carried out in a separate shaft with a moving bed at a granulate temperature in the range of 120 to 210°C, wherein the shaft is operated in counter-flow mode with inert gas, steam or a mixture of inert gas and steam, the inert gas is fed at at least two points along the shaft, wherein 15 to 90% of the inert gas is fed at the base of the shaft and 10 to 85% of the inert gas is fed at the upper half below the granulate surface.

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