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    23.
    发明专利
    未知

    公开(公告)号：BR8303482A

    公开(公告)日：1984-02-07

    申请号：BR8303482

    申请日：1983-06-29

    Applicant: HOECHST AG

    Inventor： REBSDAT SIEGFRIED ,  MAYER SIGMUND ,  ALFRANSEDER JOSEF

    IPC: B01J23/58 ,  B01J23/66 ,  B01J37/02 ,  C07D301/10 ,  C07D303/04

    Abstract: Silver catalysts, useful for the oxidation of ethylene to ethylene oxide, contain 3-20 percent by weight of silver and 0.003-0.05 percent by weight of potassium, rubidium, cesium, or a mixture thereof as a promoter present on a heat-resistant porous support to which they have been applied by several impregnating steps.

    PROCESS FOR IMPROVING THE ACTIVITY OF SUPPORTED SILVER CATALYSTS
    24.
    发明专利
    PROCESS FOR IMPROVING THE ACTIVITY OF SUPPORTED SILVER CATALYSTS 未知

    公开(公告)号：CA1152973A

    公开(公告)日：1983-08-30

    申请号：CA360614

    申请日：1980-09-19

    Applicant: HOECHST AG

    Inventor： ALFRANSEDER JOSEF ,  MAYER SIGMUND ,  REBSDAT SIEGFRIED ,  RIEDL JOSEF ,  SCHAFFELHOFER IWO

    IPC: B01J23/50 ,  B01J23/66 ,  B01J23/68 ,  B01J23/96 ,  B01J38/48 ,  B01J38/66 ,  C07B61/00 ,  C07D301/10 ,  C07D303/04

    Abstract: : HOE 79/F 919 Process for improving the activity of supported silver catalysts Supported silver catalysts, which should have as high an activity as possible, are employed for the manufacture of ethylene oxide by oxidizing ethylene by means of oxygen or air. A process is described for improving the activity of supported silver catalysts which have already been used, in which the used catalyst is first washed with an inert liquid containing ammonia and/or aliphatic amines and 1 to 1,000 parts, per 1 million parts of catalyst, of cesium, rubidium or a mixture thereof is then deposited on the washed catalyst. The deposition is generally effected with the aid of an impregnating solution containing the cesium and/or rubidium compounds in a suitable quantity. This process makes it possible to improve considerably the activity of supported silver catalysts which have already been in use for the oxidation of ethylene by means of oxygen or air.

    26.
    发明专利
    未知

    公开(公告)号：DD131841A5

    公开(公告)日：1978-07-26

    申请号：DD20055477

    申请日：1977-08-12

    Applicant: HOECHST AG

    Inventor： REBSDAT SIEGFRIED ,  MAYER SIGMUND ,  ALFRANSEDER JOSEF ,  RIEDL JOSEF

    IPC: B01J23/66 ,  B01J23/96 ,  B01J38/48 ,  B01J38/50 ,  C07B61/00 ,  C07D301/10 ,  B01J23/50 ,  B01J23/58

    Abstract: The activity of supported silver catalysts used up in the direct oxidation of ethylene with molecular oxygen or air is improved by impregnating the catalyst arranged in a fixed bed with a solution of a caesium and/or rubidium compound in an inert organic solvent, optionally together with up to 40% by weight of water, calculated on the total liquid, as dissolving intermediary, so as to produce a concentration gradient of from 0.3 to 20 parts of caesium and/or rubidium per 1 million parts of catalyst and per meter of fixed bed, counter to the direction of flow of the gas to be reacted. In this manner the activity of the catalyst is considerably improved which results in an increased selectivity of the oxidation of ethylene to ethylene oxide.

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