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    PROCESS FOR SEPARATING WATER FROM MIXTURES THEREOF WITH VINYL ACETATE AND ACETIC ACID
    2.
    发明专利
    PROCESS FOR SEPARATING WATER FROM MIXTURES THEREOF WITH VINYL ACETATE AND ACETIC ACID 未知

    公开(公告)号：CA1172597A

    公开(公告)日：1984-08-14

    申请号：CA363606

    申请日：1980-10-30

    Applicant: HOECHST AG ,  WACKER CHEMIE GMBH

    Inventor： ROSCHER GUENTER ,  SCHMIDT KARL-HEINZ ,  LANGNER HORST ,  NEU HERMANN ,  LIENERTH ALADAR ,  DEMPF DOMINIK ,  KAISER KLAUS

    IPC: C07C67/055 ,  C07C67/54 ,  C07C69/15 ,  B01D3/36

    Abstract: HOE 79/F 289 PROCESS FOR SEPARATING WATER FROM MIXTURES THEREOF WITH VINYL ACETATE AND ACETIC ACID of the disclosure: Process for separating water from a gas mixture, obtained in the manufacture of vinyl acetate by reacting ethylene with acetic acid and oxygen in contact with catalysts containing palladium or palladium compounds in the gaseous phase and consisting essentially of acetic acid, vinyl acetate, water, carbon dioxide and ethylene, wherein a) the gas mixture leaving the reaction zone is condensed to give a condensate containing the main amount of acetic acid, of vinyl acetate and of water and b) an acetic acid solution containing the residual amount of vinyl acetate and water is prepared by absorption of the non condensed gas in acetic acid, is characterized in that c) the condensate obtained in step a) and the solution obtained in step b) are introduced separately from each other into the same distillation column, the feeding point of the condensate being above the feeding point of the solution, the water is distilled off at the head of said column as azeotrope together with the vinyl acetate and d) the water phase is removed from the distillate separating into a water phase and a vinyl acetate phase.

    PROCESS FOR THE ISOLATION OF VINYL ACETATE
    8.
    发明专利
    PROCESS FOR THE ISOLATION OF VINYL ACETATE 未知

    公开(公告)号：GB2160520A

    公开(公告)日：1985-12-24

    申请号：GB8515249

    申请日：1985-06-17

    Applicant: HOECHST AG

    Inventor： ROSCHER DR GUNTER ,  SCHMIDT DR KARL HEINZ ,  HEY DR HANSJORG ,  LANGNER HORST ,  ANDEREYA ERWIN

    IPC: B01D3/00 ,  C07C51/44 ,  C07C67/055 ,  C07C67/48 ,  C07C67/54 ,  C07C69/15

    Abstract: The invention relates to a process for the isolation of vinyl acetate from a gas mixture containing vinyl acetate, ethyl acetate, water and carbon dioxide formed in the reaction of ethylene with acetic acid and oxygen in the gas phase over catalysts containing palladium or palladium compounds. The gas mixture leaving the reaction zone is passed into a distillation column and the gas mixture leaving the top thereof is cooled. The gas which is not condensed during the cooling is washed with acetic acid in a washing column, an acetic acid solution containing vinyl acetate being obtained. The bottom product from the distillation column is passed to a second distillation column and a side stream containing ethyl acetate is removed from an enrichment zone above the bottom thereof, all or some of the bottom product from the second distillation column, which product chiefly consists of acetic acid, being used for the wash in the washing column. The top vapor of the second distillation column is cooled. A portion of the organic phase of the condensate thereby formed is passed, together with the acetic acid solution obtained as the bottom product in the washing column, into a third distillation column, which may have an intermediate tray. The bottom product of the third distillation column is passed into a fourth distillation column. Pure vinyl acetate is removed at the top of the fourth distillation column.

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