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    31.
    发明专利
    未知

    公开(公告)号：DE59309693D1

    公开(公告)日：1999-08-19

    申请号：DE59309693

    申请日：1993-04-24

    Applicant: BASF AG

    Inventor： FUCHS HUGO ,  RITZ JOSEF ,  PRIESTER CLAUS ULRICH ,  NEUBAUER GERALD

    IPC: C07D201/12 ,  C07D223/10 ,  C08G69/14

    Abstract: Process for the recovery of caprolactam from polycaprolactam by hydrolytic cleavage of polycaprolactam with 5 to 50 parts by weight of water per part by weight of polycaprolactam at a temperature from 200 to 350 DEG C at elevated pressure with the production of an aqueous solution or suspension which contains monomeric caprolactam, its oligomer and optionally polycaprolactam and subsequent removal of monomeric caprolactam from the aqueous solution or suspension by distillation or extraction, the hydrolytic cleavage being carried out at a pH from 5 to 10 with the additional use of alkali metal hydroxide.

    PROCESS FOR CONTINUOUSLY CLEANING RAW CAPROLACTAM MADE FROM 6-AMINO CAPRONITRILE
    33.
    发明专利
    PROCESS FOR CONTINUOUSLY CLEANING RAW CAPROLACTAM MADE FROM 6-AMINO CAPRONITRILE 未知

    公开(公告)号：SK84097A3

    公开(公告)日：1998-05-06

    申请号：SK84097

    申请日：1995-12-22

    Applicant: BASF AG

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

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

    Abstract: Crude capronitrile is purified by hydrogenation, subsequent treatment in an acidic medium and subsequent distillation in an alkaline medium, by a process in which (a) 6-aminocapronitrile is converted into crude caprolactam by reaction with water, (b) high boilers and low boilers are separated off from the crude caprolactam from step (a), (c) the crude caprolactam from step (b) is treated with hydrogen at from 50 DEG to 150 DEG C. and from 1.5 to 250 bar in the presence of a hydrogenation catalyst and, if desired, of a solvent to give a mixture A, (d1) mixture A in a solvent is passed, at from 30 DEG to 80 DEG C. and from 1 to 5 bar, over an ion exchanger containing terminal acid groups to give a mixture B1, or (d2) mixture A is distilled in the presence of sulfuric acid, any solvent present being removed before the addition of the sulfuric acid, to give a mixture B2, and (e) mixture B1 or mixture B2 is distilled in the presence of a base to give pure caprolactam.

    METHOD FOR CONTINUOUS PURIFICATION OF RAW CAPROLACTAM PRODUCED FROM 6-AMINOCAPRONITRILE
    34.
    发明专利
    METHOD FOR CONTINUOUS PURIFICATION OF RAW CAPROLACTAM PRODUCED FROM 6-AMINOCAPRONITRILE 未知

    公开(公告)号：BG101672A

    公开(公告)日：1998-02-27

    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 caprolactamis purified by hydrogenation after which it is treated in acidicmedium and is distilled in alkaline medium, when: (a)6-aminiocapronitrile is converted in raw caprolactam by reactionwith water, (b) the high-boiling and low-boiling components areseparated from the raw caprolactam from stage (a), (c) the rawcaprilactam of stage (b) is treated with hydrogen at temperaturesranging from 50 to 150°C and from 1.5 to 250 bar in the presenceof hydrogenation catalyst and optionally of solvent, thusproducing mixtire A, (d1) mixture A in a solvent is passed at 30to 80°C and from 1 to 5 bar through ion-exchange resin having andacidic groups, thus producing mixture B1, or (d2) mixture A isdistilled in the presence of sulphuric acid and any amount ofsolvent is eliminated before the addition of the sulphuric acid,thus producing mixture B2, and mixture B1 or B2 is distilled inthe presence of a base, thus producing pure caprolactam.

    36.
    发明专利
    未知

    公开(公告)号：ID17664A

    公开(公告)日：1998-01-15

    申请号：ID972506

    申请日：1997-07-18

    Applicant: BASF AG

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

    IPC: C07C231/06 ,  C07C237/06 ,  C07C253/00 ,  C07C255/24 ,  C07D201/08 ,  C07D201/12 ,  C07D201/16 ,  H05K ,  H01R

    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.

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