中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

63 records (took 0.023 seconds)

    Reductive coupling of nitrobenzene to azo- and azoxy-benzene for antioxidants, dyes, etc.
    25.
    发明专利
    Reductive coupling of nitrobenzene to azo- and azoxy-benzene for antioxidants, dyes, etc. 未知

    公开(公告)号：DE19633552A1

    公开(公告)日：1998-02-26

    申请号：DE19633552

    申请日：1996-08-20

    Applicant: BASF AG

    Inventor： HAGEMEYER ALFRED DR ,  HEINEKE DANIEL DR ,  VOIT GUIDO DR

    IPC: C07C245/08 ,  C07C291/08 ,  B01J23/18

    Abstract: A process for the reductive coupling of nitrobenzene (NB) to give azobenzene (AB) and azoxybenzene (AOB), comprises passing NB with gaseous, hydrogen-free reducing agent(s) (RA) at elevated temperature in the gas phase over a heterogeneous redox catalyst in its reduced or partly reduced form. The catalyst contains active metal(s) of Bi, V, Cr, Mn, Fe, Co, Pb, Mo, Ce, U, Sn, Sb, Cu, La, W, Nb, Pd, Pt, Ni and/or In, and the average oxidation state of the active metal before contact with NB and RA is at least 0.5 below the maximum oxidation state which is stable under the reaction conditions. Also claimed is (i) a similar process in which the NB is deoxygenated by passing over a redox catalyst as above in the absence of any free gaseous RA and in amounts such that the catalyst is not completely spent; and (ii) redox catalysts as above.

    26.
    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.

    30.
    发明专利
    未知

    公开(公告)号：DE19614283A1

    公开(公告)日：1997-10-16

    申请号：DE19614283

    申请日：1996-04-11

    Applicant: BASF AG

    Inventor： SCHNURR WERNER DR ,  VOIT GUIDO DR ,  FLICK KLEMENS DR ,  FISCHER ROLF-HARTMUTH DR

    IPC: B01J23/78 ,  B01J23/94 ,  B01J27/187 ,  B01J27/28 ,  B01J38/10 ,  C07B61/00 ,  C07C209/48 ,  C07C211/12 ,  C07C253/30 ,  C07C255/24 ,  C07C211/00 ,  C07C209/44 ,  C07C255/00 ,  C07C255/01 ,  C07C255/02 ,  C07C255/04

    Abstract: The invention concerns a method of producing compounds containing NH2 groups by the hydrogenation of compounds which include at least one carbon-nitrogen bond with hydrogen in the presence of a catalyst, at a temperature not below room temperature and at an elevated hydrogen partial pressure, optionally in the presence of a solvent. The hydrogenation is carried out under the following conditions: a) a catalyst containing cobalt and/or iron is used, b) if the yield, based on the compound being hydrogenated, and/or the selectivity, based on the desired product, drops below a defined value or if the amount of an undesired side-product increases to more than a defined value, the hydrogenation is interrupted by stopping the feed of the compound being hydrogenated and, if present, also the solvent, c) the catalyst is treated with hydrogen at a temperature in the range 150 to 400 DEG C, using a hydrogen pressure of 0.1 to 30 MPa and a treatment time of 2 to 48 h and d) the hydrogenation is subsequently continued, and the catalysts containing cobalt and/or iron are regenerated.

Patent Agency Ranking