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    PROCESS FOR PRODUCING ETHYLENE OXIDE BY GAS-PHASE OXIDATION OF ETHYLENE
    1.
    发明申请
    PROCESS FOR PRODUCING ETHYLENE OXIDE BY GAS-PHASE OXIDATION OF ETHYLENE 有权

    公开(公告)号：US20210387958A1

    公开(公告)日：2021-12-16

    申请号：US17285780

    申请日：2019-09-19

    Applicant: BASF SE

    Inventor： Andrey KARPOV ,  Marco Oskar KENNEMA ,  Nicolas DUYCKAERTS ,  Christian WALSDORFF ,  Christian BARTOSCH ,  Juergen ZUEHLKE ,  Miguel Angel ROMERO VALLE

    IPC: C07D301/10 ,  B01J23/68 ,  B01J35/00 ,  B01J35/02 ,  B01J35/04 ,  B01J35/10 ,  B01J21/04

    Abstract: A process for producing ethylene oxide by gas-phase oxidation of ethylene, comprising: directing a feed comprising gaseous ethylene and gaseous oxygen through a packing of individual shaped catalyst bodies, under conditions conducive to obtain a reaction mixture containing at least 2.7 vol.-% of ethylene oxide, wherein each shaped catalyst body comprises silver deposited on a refractory support and is characterized by a content of at least 20 wt.-% of silver, relative to the total weight of the shaped catalyst body; a BET surface area in the range of 1.6 to 3.0 m2/g; a first face side surface, a second face side surface and a circumferential surface with a plurality of passageways extending from the first face side surface to the second face side surface; and a uniform multilobed cross-section; and a longest direct diffusion pathway d, with 2d being in the range of 0.7 to 2.4 mm, wherein the longest diffusion pathway d is defined as the shortest distance from the geometric surface of the shaped catalyst body to a point inside the structure of the shaped catalyst body for which point the shortest distance is the largest among all points. The process allows for increased activity and/or stability of the catalyst while maintaining or increasing selectivity at high productivity.

    CATALYST FOR PRODUCING ETHYLENE OXIDE BY GAS-PHASE OXIDATION
    2.
    发明申请
    CATALYST FOR PRODUCING ETHYLENE OXIDE BY GAS-PHASE OXIDATION 有权

    公开(公告)号：US20210379569A1

    公开(公告)日：2021-12-09

    申请号：US17285799

    申请日：2019-09-19

    Applicant: BASF SE

    Inventor： Andrey KARPOV ,  Marco Oskar KENNEMA ,  Nicolas DUYCKAERTS ,  Christian WALSDORFF ,  Christian BARTOSCH ,  Juergen ZUEHLKE ,  Miguel Angel

    IPC: B01J23/68 ,  B01J21/04 ,  B01J37/02 ,  B01J35/10 ,  B01J37/08 ,  B01J35/04 ,  B01J35/02 ,  C07D301/04

    Abstract: A shaped catalyst body for producing ethylene oxide by gas-phase oxidation of ethylene, comprising silver deposited on a porous refractory support, the shaped catalyst body having a first face side surface, a second face side surface and a circumferential surface, characterized by a content of at least 20 wt.-% of silver, relative to the total weight of the shaped catalyst body; a multilobe structure; a plurality of passageways extending from the first face side surface to the second face side surface, outer passageways being arranged around a central passageway with one outer passageway being assigned to each lobe, wherein neighboring outer passageways are arranged essentially equidistantly to each other and the outer passageways are arranged essentially equidistantly to the central passageway; a minimum wall thickness A between two neighboring passageways in the range of 0.6 to 1.3 mm; a minimum wall thickness B between each outer passageway and the circumferential surface in the range of 1.1 to 1.8 mm; and a BET surface area in the range of 1.6 to 3.0 m2/g. The shaped catalyst bodies allow for a favorable balance between mechanical stability, pressure drop and selectivity. The invention also relates to a process for producing ethylene oxide by gas-phase oxidation of ethylene, comprising reacting ethylene and oxygen in the presence of a shaped catalyst body as defined above. The invention further relates to a process for preparing a shaped catalyst body as above, comprising i) impregnating a refractory support having a BET surface area in the range of 1.4 to 2.5 m2/g with a silver impregnation solution; and ii) subjecting the impregnated refractory support to a calcination process; wherein steps i) and ii) are optionally repeated.

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