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    PROCESS FOR THE MANUFACTURE OF VINYL CHLORIDE BY THE THERMAL CRACKING OF 1,2- DICHLOROETHANE
    13.
    发明专利
    PROCESS FOR THE MANUFACTURE OF VINYL CHLORIDE BY THE THERMAL CRACKING OF 1,2- DICHLOROETHANE 未知

    公开(公告)号：CA1136161A

    公开(公告)日：1982-11-23

    申请号：CA354769

    申请日：1980-06-25

    Applicant: UHDE GMBH ,  HOECHST AG

    Inventor： LINK GERHARD ,  FROEHLICH WALTER ,  KRUMBOECK REINHARD ,  RIEDL JOSEF

    IPC: C07C21/06

    Abstract: Process for the manufacture of vinyl chloride by thermal cracking of 1,2-dichloroethane. The description covers a process for the manufacture of vinyl chloride by thermal cracking of 1,2-dichloroethane. The hot gas leaving the reaction furnace is cooled to the inlet temperature of the column in which the hydrogen chloride is separated from the products of thermal cracking of the 1,2-dichloroethane. Within the range of 560 to 480 oC and of 220 to 120 oC, one or more cooling stages are applied through which the reaction gas mixture passes at high flow velocity, the cooling device being preferably a single-tube cooler. Starting from about 220 oC, a liquid substantially consisting of 1,2-dichloroethane may be added intermittently. The heat transferred to the coolant in the stages of indirect cooling is preferably reused within the vinyl chloride manufacturing process. RVPP02000390580

    14.
    发明专利
    未知

    公开(公告)号：RO73097A

    公开(公告)日：1982-05-10

    申请号：RO9135177

    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 ,  C07D303/04

    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.

    PROCESS FOR IMPROVING THE ACTIVITY OF USED SUPPORTED SILVER CATALYSTS
    15.
    发明专利
    PROCESS FOR IMPROVING THE ACTIVITY OF USED SUPPORTED SILVER CATALYSTS 未知

    公开(公告)号：CA1103651A

    公开(公告)日：1981-06-23

    申请号：CA284612

    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

    Abstract: HOE 76/F 913 PROCESS FOR IMPROVING THE ACTIVITY OF USED SUPPORTED SILVER CATALYSTS of the disclosure: 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 gass 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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