11.
    发明专利
    未知

    公开(公告)号:FI931556A

    公开(公告)日:1993-10-09

    申请号:FI931556

    申请日:1993-04-06

    Applicant: HOECHST AG

    Abstract: The invention relates to improved Pd/K/Au, Pd/K/Ba and Pd/K/Cd supported catalysts, the preparation thereof, and the use thereof for preparing vinyl acetate from ethylene, acetic acid and oxygen in the gas phase. These catalysts are prepared by atomising a solution of the corresponding metal salts by means of ultrasound and then applying it in such limited amounts and within such a limited time to the support particles and commencing the drying thereof, that the catalytically active metal salts cannot penetrate the support particles as far as their core but only an outer part of greater or lesser size.

    PROCESS FOR THE PREPARATION OF VINYL ACETATE

    公开(公告)号:CA2031429A1

    公开(公告)日:1991-06-06

    申请号:CA2031429

    申请日:1990-12-04

    Applicant: HOECHST AG

    Abstract: - - HOE 89/F 384 of the disclosure Process for the preparation of vinyl acetate The invention relates to a process for the preparation of vinyl acetate in the gas phase from ethylene, acetic acid and oxygen or oxygen-containing gases on a catalyst which contains palladium and/or its compounds and, if desired, additionally gold and/or gold compounds and which contains as activators alkali metal compounds and,if desired,additionally cadmium compounds on a support which is composed of SiO2 or an SiO2 Al2O3 mixture having a surface area of 50 - 250 m2/g and a pore volume of 0.4 - 1.2 ml/g and whose particles have a particle size of 4 to 9 mm, 5 to 20% of the pore volume of the support being formed of pores having radii of 200 to 3000 .ANG. and 50 to 90% of the pore volume being formed of pores having radii of 70 to 100 .ANG.. The support particles are compressed with the aid of an Li, Mg, Al, Zn or Mn salt of a C2-C20 carboxylic acid or a mixture of such salts as binder.

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