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    PROCESS FOR CONTINUOUS PURIFICATION OF CRUDE CAPROLACTAM PREPARED FROM 6-AMINOCAPRONITRILE
    51.
    发明专利
    PROCESS FOR CONTINUOUS PURIFICATION OF CRUDE CAPROLACTAM PREPARED FROM 6-AMINOCAPRONITRILE 未知

    公开(公告)号：CA2209336A1

    公开(公告)日：1996-07-11

    申请号：CA2209336

    申请日：1995-12-22

    Applicant: BASF AG

    Inventor： RITZ JOSEF ,  LUYKEN HERMANN ,  FISCHER ROLF ,  ACHHAMMER GUENTHER ,  SCHNURR WERNER ,  FUCHS EBERHARD

    IPC: C07D201/08 ,  C07B63/02 ,  C07D201/16 ,  C07D223/10

    Abstract: Cleaning raw caprolactam by hydration, subsequent treatment in an acid medium and final distillation in an alkaline medium, in which (a) 6-amino capronitrile is converted into raw caprolactam by reaction with water; (b) difficultly and easily boiling components are removed from the raw caprolactam from step (a); (c) the raw caprolactam from step (b) is treated with hydrogen at a temperature in the 50 to 150 .degree.C range and a pressure in the 1.5 to 250 bar range in the presence of a hydration catalyst and, if desired, a solvent, to give a mixture A;(d1) mixture A is taken at a temperature in the 30 to 80 .degree.C range and a pressure in the 1 to 5 bar range over an ion exchanger containing acid terminal groups to give a mixture B1 or (d2) mixture A is distilled in the presence of sulphuric acid, in which any solvent is removed before the addition of the sulphuric acid to give a mixture B2; and (e) mixture B1 or B2 is distilled in the presence of a base to yield pure caprolactam.

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