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    12.
    发明专利
    未知

    公开(公告)号：BR9509987A

    公开(公告)日：1997-12-30

    申请号：BR9509987

    申请日：1995-12-01

    Applicant: BASF AG

    Inventor： KOPIETZ MICHAEL ,  HANDERMAN ALAN ,  JONES SIMON A ,  KALCK ULRICH ,  PRIESTER CLAUS-ULRICH ,  AUER HEINZ ,  RITZ JOSEF ,  FUCHS HUGO ,  PIJL PAUL

    IPC: B01J8/10 ,  C07D201/12 ,  C08G69/14 ,  C08J11/16

    Abstract: Caprolactam is obtained from caprolactam-containing polymers in the presence of a base under reduced pressure by depolymerizing polymers which contain the repeating unit -[-N(H)-(CH2)5-C(O)-] or mixtures consisting essentially of from 50 to 99.99% by weight of a polymer containing the repeating unit -[-N(H)-(CH2)5-C(O)-]- from 0.01 to 50% by weight of additives selected from the group consisting of inorganic fillers, organic and inorganic pigments and dyes, from 0 to 10% by weight of organic and/or inorganic additives, from 0 to 40% by weight of non-polyamide-containing polymers and from 0 to 20% by weight of polyamides, with the exception of polycaprolactam and copolyamides prepared from caprolactam, in at least two depolymerization reactors connected in series.

    18.
    发明专利
    未知

    公开(公告)号：DE59706018D1

    公开(公告)日：2002-02-21

    申请号：DE59706018

    申请日：1997-07-07

    Applicant: BASF AG

    Inventor： RITZ JOSEF ,  ACHHAMMER GUENTHER ,  FISCHER ROLF ,  FUCHS EBERHARD ,  VOIT GUIDO

    IPC: C07C231/06 ,  C07C237/06 ,  C07C253/00 ,  C07C255/24 ,  C07D201/08 ,  C07D201/12 ,  C07D201/16

    Abstract: A process for preparing caprolactam by cyclization of 6-aminocapronitrile in the presence of water at elevated temperature and in the presence or absence of a catalyst and a solvent, comprises a) removing from the cyclization reaction effluent ("reaction effluent I") caprolactam and all components boiling higher than caprolactam ("high boilers"), b) treating the high boilers of stage a) with phosphoric acid and/or polyphosphoric acid at from 200 to 350 DEG C. to obtain a reaction effluent II, and c) removing caprolactam formed and any 6-aminocapronitrile from reaction effluent II of stage b) to obtain separation from unconverted high boilers and acid used.

    METHOD FOR CONTINUOUS PURIFICATION OF RAW CAPROLACTAM PRODUCED FROM 6-AMINOCAPRONITRILE
    19.
    发明专利
    METHOD FOR CONTINUOUS PURIFICATION OF RAW CAPROLACTAM PRODUCED FROM 6-AMINOCAPRONITRILE 未知

    公开(公告)号：BG63387B1

    公开(公告)日：2001-12-31

    申请号：BG10167297

    申请日：1997-06-25

    Applicant: BASF AG

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

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

    Abstract: The invention relates to a method where the raw caprolactam is purified by hydrogenation after which it is treated in acidic medium and is distilled in alkaline medium, when: (a) 6-aminiocapronitrile is converted in raw caprolactam by reaction with water, (b) the high-boiling and low-boiling components are separated from the raw caprolactam from stage (a), (c) the raw caprilactam of stage (b) is treated with hydrogen at temperatures ranging from 50 to 150©C and from 1.5 to 250 bar in the presence of hydrogenation catalyst and optionally of solvent, thus producing mixtire A, (d1) mixture A in a solvent is passed at 30 to 80©C and from 1 to 5 bar through ion-exchange resin having and acidic groups, thus producing mixture B1, or (d2) mixture A is distilled in the presence of sulphuric acid and any amount of solvent is eliminated before the addition of the sulphuric acid, thus producing mixture B2, and mixture B1 or B2 is distilled in the presence of a base, thus producing pure caprolactam. 2 claims

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