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    Method for preparing caprolactam
    21.
    发明专利
    Method for preparing caprolactam 未知

    公开(公告)号：AU4257496A

    公开(公告)日：1996-06-26

    申请号：AU4257496

    申请日：1995-11-29

    Applicant: BASF AG

    Inventor： FUCHS EBERHARD ,  ACHHAMMER GUNTHER

    IPC: C07D201/08 ,  C07D223/10

    Abstract: An improved process for the preparation of caprolactam by heating 6-aminocapronitrile in the presence of a heterogenous catalyst and water under superatmospheric pressure without rapid deactivation of the catalysts used. The process further includes the addition of a low or high boiling alcohol in the heating phase, after which the products are obtained by distillation. The process further includes a method of working up the top and bottom products of the reactors to achieve higher yields.

    24.
    发明专利
    未知

    公开(公告)号：ES2179888T3

    公开(公告)日：2003-02-01

    申请号：ES95937070

    申请日：1995-11-14

    Applicant: BASF AG

    Inventor： ACHHAMMER GUNTHER ,  FUCHS EBERHARD

    IPC: C07D201/08 ,  C07D223/10

    Abstract: Caprolactam is prepared by reacting a solution of 6-aminocapronitrile with water in the liquid phase at elevated temperatures by a process in which (a) an aqueous solution of 6-aminocapronitrile in the liquid phase is heated without the addition of a catalyst in a reactor A to give a mixture I consisting essentially of water, caprolactam and a high-boiling fraction (high boiler), then (b) the water is removed from the resulting mixture I to give a mixture II consisting essentially of caprolactam and the high boilers, then (c) the caprolactam and the high boilers from mixture II are separated from one another by distillation, and then either (d1) the high boilers from stage (c) are fed into the reactor A of stage (a) or (d2) the high boilers are heated similarly to stage (a) in a further reactor B and then worked up similarly to stages (b) and (c) to give further caprolactam, or (d3) the high boilers are heated under reduced pressure in the presence of a base in a reactor C and the reacted mixture is worked up by distillation to give caprolactam.

    25.
    发明专利
    未知

    公开(公告)号：ID27066A

    公开(公告)日：2001-02-22

    申请号：ID20010161

    申请日：1999-07-02

    Applicant: BASF AG

    Inventor： LUYKEN HERMANN ,  OHLBACH FRANK ,  ANSMANN ANDREAS ,  BASSLER PETER ,  MELDER JOHANN PETER ,  MERGENR MARTIN ,  REHFINGER ALWIN ,  VOIT GUIDO ,  ACHHAMMER GUNTHER ,  FISCHER ROLF

    IPC: C07B61/00 ,  C07C209/48 ,  C07C209/84 ,  C07C209/86 ,  C07C211/12 ,  C07C253/30 ,  C07C253/34 ,  C07C255/24

    Abstract: The invention relates to a method for simultaneous production of 6-aminocapronitrile and hexamethylenediamine from adipodinitrile, comprising the following steps: a) hydrogenating adipodinitrile in the presence of a catalyst containing an element of the VIII subgroup thereby obtaining a mixture containing 6-aminocapronitrile, hexamethylenediamine, adipodinitrile and high boilers; b) distillative separation of hexamethylenediamine from the mixture containing 6-aminocapronitrile, hexamethylenediamine, adipodinitrile and high boilers or c1) distillative separating 6-aminocapronitrile and subsequently d1) distillative separation of adipodinitrile or c2) simultaneous distillative separation of 6-aminocapronitrile and adipodinitrile into separate fractions. The invention is characterized in that temperatures in the bottoms of the column in steps d1) or c2) are under 185 DEG C. The adipodinitrile thus obtained contains less impurities than for instance 1-amino-2-cyanocyclopentenes.

    26.
    发明专利
    未知

    公开(公告)号：ES2151673T3

    公开(公告)日：2001-01-01

    申请号：ES96928377

    申请日：1996-07-26

    Applicant: BASF AG

    Inventor： ACHHAMMER GUNTHER ,  ROPER MICHAEL

    IPC: C07C67/54 ,  C07C69/716

    Abstract: PCT No. PCT/EP96/03290 Sec. 371 Date Jan. 27, 1998 Sec. 102(e) Date Jan. 27, 1998 PCT Filed Jul. 26, 1996 PCT Pub. No. WO97/06126 PCT Pub. Date Feb. 20, 19975-Formylvaleric esters are prepared in a yield of not less than 90% by distillation of a formylvaleric ester mixture of 5-formylvaleric ester and either 3- or 4-formylvaleric ester or a mixture of 3- and 4-formylvaleric esters, where the ester radicals of the respective formylvaleric esters are identical, wherein the 3- or 4-formylvaleric ester or a mixture thereof is separated from the 5-formylvaleric ester in a distillation column at a pressure in the range from 2 to 100 mbar and a temperature of not above 150 DEG C. (measured as the temperature at the bottom of the column) and the esters used are the corresponding methyl or ethyl esters, where the purity of the 5-formylvaleric ester is not less than 98% and, as impurity, 4-formylvaleric ester is present in an amount of not more than 100 ppm.

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