中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

7 records (took 0.026 seconds)

    PROCESS FOR PREPARING CAPROLACTAM
    1.
    发明专利
    PROCESS FOR PREPARING CAPROLACTAM 未知

    公开(公告)号：CZ152597A3

    公开(公告)日：1997-10-15

    申请号：CZ152597

    申请日：1995-11-29

    Applicant: BASF AG

    Inventor： FUCHS EBERHARD DR ,  ACHHAMMER GUNTER DR

    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.

    PROCESS OF SIMULTANEOUS PREPARATION OF CAPROLACTAM AND HEXAMETHYLENEDIAMINE
    3.
    发明专利
    PROCESS OF SIMULTANEOUS PREPARATION OF CAPROLACTAM AND HEXAMETHYLENEDIAMINE 未知

    公开(公告)号：CZ202797A3

    公开(公告)日：1998-02-18

    申请号：CZ202797

    申请日：1995-12-22

    Applicant: BASF AG

    Inventor： ACHHAMMER GUNTER DR ,  BASSLER PETER DR ,  FISCHER ROLF DR ,  FUCHS EBERHARD DR ,  LUYKEN HERMANN ,  SCHNURR WERNER DR ,  WITZEL TOM DR

    IPC: C07D201/02 ,  C07C209/48 ,  C07C211/12 ,  C07D201/08 ,  C07D223/10

    Abstract: The invention concerns the simultaneous preparation of caprolactam and hexamethylene diamine from adipodinitrile, by the following steps: (a) the adipodinitrile is partially hydrogenated, producing a mixture substantially containing 6-aminocapronitrile, hexamethylene diamine, ammonia, adipodinitrile and hexamethylene imine (= "the mixture"); (b) the mixture obtained in step (a) is distilled, producing ammonia, as the forerunnings, and a residue I, in the presence of a compound A which is inert in the distillation conditions, the ammonia not being separated totally; (c) the residue I, substantially containing "the mixture", inert compound A and ammonia, the ammonia content being less than that of the mixture used in step (b), is subjected to a second distillation, producing a mixture of the inert compound A and ammonia, as the forerunnings, and a residue II; (d) the base II, substantially containing "the mixture" and inert compound A, is subjected to distillation in a third column, producing the inert compound A, as the forerunnings, and a residue III; (e) the base III, substantially containing "the mixture" and optionally an inert compound B, is subjected to distillation in a fourth column, producing forerunnings KP1, which substantially contain hexamethylene imine, optionally inert compound B and hexamethylene diamine, and a residue IV; (f) the forerunnings KP1 are subjected in a fifth column to distillation, producing forerunnings KP2, which substantially contain hexamethylene imine and optionally inert compound B, and a residue V, which substantially contains hexamethylene diamine with a degree of purity of at least 95 %, the forerunnings KP2 being fed to the third column or optionally only partially fed to the third column, and the rest being discarded; and (g) the residue IV, substantially containing 6-aminocapronitrile and adipodinitrile, is subjected in a sixth column to distillation, producing 6-aminocapronitrile with a degree of purity of at least 95 %, as forerunnings, and adiponitrile in the residue. The resultant 6-aminocapronitrile is cyclized to form caprolactam.

    Process for preparing caprolactam
    4.
    发明专利
    Process for preparing caprolactam 未知

    公开(公告)号：CZ290643B6

    公开(公告)日：2002-09-11

    申请号：CZ152597

    申请日：1995-11-29

    Applicant: BASF AG

    Inventor： FUCHS EBERHARD DR ,  ACHHAMMER GUNTER DR

    IPC: C07D201/08 ,  C07D223/10

    Abstract: In the present invention there is disclosed a process for preparing caprolactam comprising the following steps: (a) heating 6-aminocaproic acid nitrile or a mixture of nitrile/water/alcohol with a catalyst in a reactor A to obtain a mixture I; (b) distillation of the mixture I to obtain overhead distillate, caprolactam and a sink, whereby ammonia being present in the mixture I is optionally distilled off therefrom; (c) treating the overhead distillate in the A reactor of the step (a) after optional mixing thereof with the nitrile/water/alcohol mixture used in the step (a) prior introduction into the reactor A, or by introducing the overhead distillate, optionally with the sink of the step (b) into a reactor B, whereby prior introducing the overhead distillate into the reactor B can be optionally mixed with the nitrile/water/alcohol mixture used in the step (a) and then caprolactam is obtained by distillation in analogous way to the step (b), and (d) mixing the sink with water and heating thereof in a reactor D to obtain a reaction product, from which caprolactam is subsequently distilled off.

    CONTINUOUS PURIFICATION PROCESS OF RAW CAPROLACTAM BEING PREPARED FROM 6-AMINOCAPRONITRILE
    6.
    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.

Patent Agency Ranking