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    34.
    发明专利
    未知

    公开(公告)号：ES2135426T3

    公开(公告)日：1999-11-01

    申请号：ES93106681

    申请日：1993-04-24

    Applicant: BASF AG

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

    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.

    CONTINUOUS PURIFICATION PROCESS OF RAW CAPROLACTAM BEING PREPARED FROM 6-AMINOCAPRONITRILE
    36.
    发明专利
    CONTINUOUS PURIFICATION PROCESS OF RAW CAPROLACTAM BEING PREPARED FROM 6-AMINOCAPRONITRILE 未知

    公开(公告)号：CZ197297A3

    公开(公告)日：1998-03-18

    申请号：CZ197297

    申请日：1995-12-22

    Applicant: BASF AG

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

    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.

    37.
    发明专利
    未知

    公开(公告)号：DE19628805A1

    公开(公告)日：1998-01-22

    申请号：DE19628805

    申请日：1996-07-17

    Applicant: BASF AG

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

    IPC: C07C231/06 ,  C07C237/06 ,  C07C253/00 ,  C07C255/24 ,  C07D201/08 ,  C07D201/12 ,  C07D201/16 ,  C07D223/10

    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.

    38.
    发明专利
    未知

    公开(公告)号：DE19500041A1

    公开(公告)日：1996-07-04

    申请号：DE19500041

    申请日：1995-01-03

    Applicant: BASF AG

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

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

    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.

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