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    23.
    发明专利
    未知

    公开(公告)号：CH623567A5

    公开(公告)日：1981-06-15

    申请号：CH219076

    申请日：1976-02-23

    Applicant: BASF AG

    Inventor： RAPP CHEM GUENTHER DR ,  FUCHS CHEM HUGO DR ,  THOMAS ERWIN

    IPC: C07D223/08 ,  C07C67/00 ,  C07C239/00 ,  C07C251/46 ,  C07D201/04 ,  C07D223/10 ,  C07C131/04

    Abstract: An improved process for the manufacture of cyclohexanone oxime by reacting cyclohexanone with an aqueous hydroxylammonium-ammonium sulfate solution at temperatures above the melting point of cyclohexanone oxime by the countercurrent process, the improvement consisting in that the reaction is carried out in the absence of solvents and neutralizing and/or buffer salts at pHs of up to 0.5 until equilibrium is reached, the oximes resulting during the reaction being separated from the aqueous phase and the aqueous phase being extracted with cyclohexanone and then subjected to steam distillation.

    24.
    发明专利
    未知

    公开(公告)号：DE2743297B1

    公开(公告)日：1979-03-29

    申请号：DE2743297

    申请日：1977-09-27

    Applicant: BASF AG

    Inventor： JOCKERS KURT DIPL-CHEM DR ,  RAPP GUENTHER DIPL-CHEM DR ,  THOMAS ERWIN

    IPC: B01J23/00 ,  C01B21/14 ,  C22C38/50

    Abstract: Hydroxylammonium salts are manufactured by a process comprising the catalytic reduction of nitric oxide with hydrogen in a dilute aqueous mineral acid in the presence of a suspended platinum catalyst at an elevated temperature, wherein the reaction is carried out in vessels of which the walls consist of conventional copper-free molybdenum-containing austenitic chromium-nickel steels which contain from 16 to 28% by weight of chromium, from 20 to 50% by weight of nickel, from 1 to 4% by weight of molybdenum and at most 0.1% by weight of carbon and which in addition contain an amount of titanium which is at least 5 times the amount of carbon but is not more than 1.0% by weight, or an amount of niobium or tantalum which is at least 8 times the amount of carbon but is not more than 1.5% by weight. The present invention relates to a process for the manufacture of of hydroxylammonium salts by catalytically reducing nitric oxide with hydrogen in a dilute aqueous mineral acid in the presence of a suspended platinum catalyst at an elevated temperature, using corrosion-resistant materials of construction.

    26.
    发明专利
    未知

    公开(公告)号：DE2508247A1

    公开(公告)日：1976-09-09

    申请号：DE2508247

    申请日：1975-02-26

    Applicant: BASF AG

    Inventor： RAPP GUENTHER DIPL CHEM DR ,  FUCHS HUGO DIPL CHEM DR ,  THOMAS ERWIN

    IPC: C07D223/08 ,  C07C67/00 ,  C07C239/00 ,  C07C251/46 ,  C07D201/04 ,  C07D223/10 ,  C07C131/04

    Abstract: An improved process for the manufacture of cyclohexanone oxime by reacting cyclohexanone with an aqueous hydroxylammonium-ammonium sulfate solution at temperatures above the melting point of cyclohexanone oxime by the countercurrent process, the improvement consisting in that the reaction is carried out in the absence of solvents and neutralizing and/or buffer salts at pHs of up to 0.5 until equilibrium is reached, the oximes resulting during the reaction being separated from the aqueous phase and the aqueous phase being extracted with cyclohexanone and then subjected to steam distillation.

    30.
    发明专利
    未知

    公开(公告)号：DE3713733A1

    公开(公告)日：1988-11-17

    申请号：DE3713733

    申请日：1987-04-24

    Applicant: BASF AG

    Inventor： FUCHS HUGO DR ,  RITZ JOSEF DR ,  THOMAS ERWIN ,  WEISS FRANZ-JOSEF DR

    IPC: B01J23/42 ,  C01B21/14

    Abstract: Hydroxylammonium salts are prepared by catalytic reduction of nitrogen monoxide with hydrogen at elevated temperature in a dilute aqueous solution of a mineral acid in the presence, in suspension, of a supported platinum catalyst obtainable by precipitating metallic platinum from an aqueous platinum solution onto a support by means of a reducing agent in the presence of an organic chelating agent and partially poisoned with sulfur.

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