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    4.
    发明专利
    未知

    公开(公告)号：DE3767824D1

    公开(公告)日：1991-03-07

    申请号：DE3767824

    申请日：1987-10-15

    Applicant: BASF AG

    Inventor： BRAND UWE ,  SCHMITZ RUEDIGER ,  DEUKER ERNST ,  FUCHS HUGO

    IPC: C07D201/04 ,  C07D201/16

    Abstract: Reaction mixtures obtained by Beckmann rearrangement of cyclohexanone oxime with sulfuric acid or oleum are neutralized by a process which comprises the following steps: (a) mixing the reaction mixture with recycled ammonium sulfate mother liquor whose concentration is chosen so that no solid ammonium sulfate is precipitated during the neutralization, (b) neutralization by feeding gaseous ammonia which contains water or an aqueous ammonium sulfate solution in finely divided liquid form through a plurality of nozzle orifices into the solution of the reaction mixture in the ammonium sulfate mother liquor at elevated temperatures, (c) separation of crude lactam from the aqueous ammonium sulfate solution, (d) evaporation of the ammonium sulfate solution under reduced pressure and with separation of the crystalline ammonium sulfate from the ammonium sulfate mother liquor and (e) recycling of the ammonium sulfate mother liquor to stage a).

    PROCESS FOR THE PRODUCTION OF EPSILON-CAPROLACTAM BY CATALYTIC CONVERSION OF A CYCLOHEXANONE OXIME
    6.
    发明专利
    PROCESS FOR THE PRODUCTION OF EPSILON-CAPROLACTAM BY CATALYTIC CONVERSION OF A CYCLOHEXANONE OXIME 未知

    公开(公告)号：DE2962722D1

    公开(公告)日：1982-06-24

    申请号：DE2962722

    申请日：1979-10-08

    Applicant: BASF AG

    Inventor： FUCHS HUGO DR ,  BRAND UWE ,  HORN PETER DR

    IPC: B01J21/02 ,  B01J21/20 ,  C07D201/04

    Abstract: In a process for the preparation of epsilon -caprolactam by catalytic rearrangement of cyclohexanone-oxime in the gas phase at from 230 DEG to 450 DEG C. over a supported catalyst, containing boron trioxide, in a fluidized bed, wherein the catalyst is removed from the fluidized bed at the rate at which it becomes spent and is treated, in a fluidized state, with gases containing molecular oxygen at from 600 DEG to 900 DEG C., after which boron trioxide or boric acid is added to the fluidized catalyst, at from 300 DEG to 900 DEG C., before the catalyst is returned to the fluidized bed, the improvement that boron trioxide or boric acid of particle size from 0.05 to 1.5 mm is fed to the fluidized catalyst at one or more points.

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