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    PROCESS FOR THE PREPARATION OF HYDROXYL AMMONIUM SALTS
    44.
    发明专利
    PROCESS FOR THE PREPARATION OF HYDROXYL AMMONIUM SALTS 未知

    公开(公告)号：DE2860073D1

    公开(公告)日：1980-11-13

    申请号：DE2860073

    申请日：1978-08-09

    Applicant: BASF AG

    Inventor： RAPP GUENTHER DR ,  THOMAS ERWIN ,  WOLF DIETER DR ,  KUERTEN HERIBERT ,  ZEHNER PETER DR

    IPC: B01J10/00 ,  B01J19/24 ,  B01J19/26 ,  B01J23/00 ,  C01B21/14

    Abstract: Hydroxylammonium salts are manufactured by a process comprising the catalytic reduction of nitric oxide with hydrogen in a dilute aqueous solution of a mineral acid in the presence of a suspended platinum catalyst at an elevated temperature, wherein the reaction mixture is recycled and the gas mixture, containing nitric oxide and hydrogen, present in the gas space above the reaction zone, is introduced, by means of one or more downwardly directed jets of liquid, consisting of the recycled reaction mixture and issuing from a nozzle orifice, into one or more circulation zones which are present in the reaction zone, are open at both sides, extend in the direction of the entering jet of liquid and are completely covered by the reaction mixture, the reaction mixture leaving the bottom of the circulation zone and containing unconverted gases is deflected, passed upwards in the annular zone externally surrounding the circulation zone, and at the same time reaction mixture of low gas content is recycled from a separation zone located under the reaction zone.

    48.
    发明专利
    未知

    公开(公告)号：DE3861542D1

    公开(公告)日：1991-02-21

    申请号：DE3861542

    申请日：1988-04-14

    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.

    PROCESS FOR REGENERATING INACTIVE AND POISENED PLATINUM CATALYSTS
    49.
    发明专利
    PROCESS FOR REGENERATING INACTIVE AND POISENED PLATINUM CATALYSTS 未知

    公开(公告)号：DE3660147D1

    公开(公告)日：1988-06-01

    申请号：DE3660147

    申请日：1986-02-28

    Applicant: BASF AG

    Inventor： BIFFAR WERNER DR ,  HOFSTADT OTTO ,  KARTTE KLAUS DR ,  THOMAS ERWIN ,  WEISS FRANZ-JOSEF DR

    IPC: B01J21/14 ,  B01J23/96 ,  B01J38/00 ,  B01J38/60 ,  B01J38/68 ,  C01G55/00

    Abstract: Noble metal catalyst, in particular platinum catalysts, which are applied on carriers and have become poisoned by metals as a result of being used for many years in the preparation of hydroxyl-ammonium salts by catalytic reduction of nitric oxide with hydrogen in an aqueous mineral acid are regenerated by a process in which the metallic impurities are dissolved using nitric acid or aqua regia, the solution is neutralized, the troublesome metals are precipitated from the neutralized solution by means of a selective precipitating reagent, and the purified platinum solution is reused for the preparation of the catalyst. Organic complexing agents which form insoluble or sparingly soluble complexes with the metallic impurities are preferably used as precipitating reagents.

    50.
    发明专利
    未知

    公开(公告)号：DE3507832A1

    公开(公告)日：1986-09-11

    申请号：DE3507832

    申请日：1985-03-06

    Applicant: BASF AG

    Inventor： BIFFAR WERNER DR ,  HOFSTADT OTTO ,  KARTTE KLAUS DR ,  THOMAS ERWIN ,  WEISS FRANZ-JOSEF DR

    IPC: B01J21/14 ,  B01J23/96 ,  B01J38/00 ,  B01J38/60 ,  B01J38/68 ,  C01G55/00

    Abstract: Noble metal catalyst, in particular platinum catalysts, which are applied on carriers and have become poisoned by metals as a result of being used for many years in the preparation of hydroxyl-ammonium salts by catalytic reduction of nitric oxide with hydrogen in an aqueous mineral acid are regenerated by a process in which the metallic impurities are dissolved using nitric acid or aqua regia, the solution is neutralized, the troublesome metals are precipitated from the neutralized solution by means of a selective precipitating reagent, and the purified platinum solution is reused for the preparation of the catalyst. Organic complexing agents which form insoluble or sparingly soluble complexes with the metallic impurities are preferably used as precipitating reagents.

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