中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

11 records (took 0.019 seconds)

    4.
    发明专利
    未知

    公开(公告)号：DE3107702A1

    公开(公告)日：1982-09-16

    申请号：DE3107702

    申请日：1981-02-28

    Applicant: BASF AG

    Inventor： GROSSKINSKY OTTO-ALFRED DIPL C ,  FROMMER ELMAR DIPL CHEM DR ,  RAPP GUENTHER DIPL CHEM DR ,  THOMAS ERWIN

    IPC: C01B21/14

    Abstract: An improved process for the continuous preparation of hydroxylammonium salts by catalytic reduction of nitric oxide with hydrogen in a dilute aqueous solution of a mineral acid in the presence of a suspended noble metal catalyst at an elevated temperature in several reaction zones connected in series, wherein the improvement comprises maintaining a pH of

    8.
    发明专利
    未知

    公开(公告)号：DE2926279A1

    公开(公告)日：1981-01-08

    申请号：DE2926279

    申请日：1979-06-29

    Applicant: BASF AG

    Inventor： FUCHS HUGO DIPL CHEM DR ,  GROSSKINSKY OTTO-ALFRED DIPL C ,  FROMMER ELMAR DIPL CHEM DR ,  KARTTE KLAUS DIPL CHEM DR

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

    Abstract: A process for purifying caprolactam, which has been obtained by a Beckmann rearrangement, by extracting crude caprolactam with solvents, distilling the extract in the presence of alkali, and isolating pure caprolactam, wherein, in a first stage, caprolactam is distilled from the alkaline distillation residue at a bottom temperature of 130 DEG -160 DEG C., and is recycled to the distillation stage, the residue thus obtained is distilled, in a second stage, at a bottom temperature of 140 DEG -180 DEG C., and the distillate is treated with strongly acidic agents in a third stage and is then recycled to the extraction stage.

    9.
    发明专利
    未知

    公开(公告)号：DE2845019A1

    公开(公告)日：1980-04-30

    申请号：DE2845019

    申请日：1978-10-16

    Applicant: BASF AG

    Inventor： HORN PETER DIPL CHEM DR ,  GROSSKINSKY OTTO-ALFRED DIPL C ,  THOMA RICHARD DIPL ING DR ,  FUCHS HUGO DIPL CHEM DR

    IPC: C07D201/04 ,  C07D223/10

    Abstract: A process for the continuous preparation of epsilon -caprolactam by Beckmann rearrangement of cyclohexanone-oxime, dissolved in a solvent which is inert toward oleum and is immiscible with oleum and water, at an elevated temperature, with removal of the heat of rearrangement by evaporation of the solvent, wherein oleum containing caprolactam is circulated successively through a conveying zone, a mixing zone, a boiling zone and a separating zone, upstream of the conveying zone oleum is added at the rate at which it is consumed, in the mixing zone cyclohexanone-oxime dissolved in solvent is added under turbulent conditions, in the boiling zone the heat of rearrangement is removed in a conventional manner by evaporating the solvent and recycling the condensate, and in the separating zone the reaction mixture is separated into a solvent phase, from which solvent is withdrawn at the rate at which the phase is formed, and a caprolactam-containing oleum phase, which is removed at the rate at which it is formed.

Patent Agency Ranking