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    Process for Preparing Butadiene by Oxidative Dehydrogenation of N-Butenes with Monitoring of the Peroxide Content During Work-Up of the Product
    25.
    发明申请
    Process for Preparing Butadiene by Oxidative Dehydrogenation of N-Butenes with Monitoring of the Peroxide Content During Work-Up of the Product 审中-公开

    公开(公告)号：US20140200381A1

    公开(公告)日：2014-07-17

    申请号：US14154604

    申请日：2014-01-14

    Applicant: BASF SE

    Inventor： Jan Pablo Josch ,  Philipp Grüne ,  Christian Walsdorff

    IPC: C07C7/05 ,  G01N31/22 ,  C07C5/48

    CPC classification number: C07C7/05 ,  C07C5/48 ,  C07C7/08 ,  C07C7/11 ,  C07C11/167

    Abstract: The invention relates to a process for preparing butadiene from n-butenes, which comprises the following steps: A) provision of a feed gas stream a comprising n-butenes; B) introduction of the feed gas stream a comprising n-butenes and an oxygen-comprising gas into at least one dehydrogenation zone and oxidative dehydrogenation of n-butenes to butadiene, giving a product gas stream b comprising butadiene, unreacted n-butenes, water vapor, oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases; C) cooling and compression of the product gas stream b in at least one cooling stage and at least one compression stage, with the product gas stream b being brought into contact with a circulated coolant to give at least one condensate stream c1 comprising water and a gas stream c2 comprising butadiene, n-butenes, water vapor, oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases; D) separation of incondensable and low-boiling gas constituents comprising oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases as gas stream d2 from the gas stream c2 by absorption of the C4-hydrocarbons comprising butadiene and n-butenes in a circulated absorption medium, giving an absorption medium stream loaded with C4-hydrocarbons and the gas stream d2, and subsequent desorption of the C4-hydrocarbons from the loaded absorption medium stream to give a C4 product gas stream d1; E) separation of the C4 product stream d1 by extractive distillation using a solvent which is selective for butadiene into a stream e1 comprising butadiene and the selective solvent and a stream e2 comprising n-butenes; F) distillation of the stream e1 comprising butadiene and the selective solvent to give a stream f1 consisting essentially of the selective solvent and a stream f2 comprising butadiene; where samples are taken from the circulated coolant in step C) and/or the circulated absorption medium in step D) and the peroxide content of the samples taken is determined by means of iodometry, differential scanning calorimetry (DSC) or microcalorimetry.

    Catalyst for producing ethylene oxide by gas-phase oxidation
    27.
    发明授权
    Catalyst for producing ethylene oxide by gas-phase oxidation 有权

    公开(公告)号：US12121881B2

    公开(公告)日：2024-10-22

    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 Romero Valle

    IPC: B01J23/68 ,  B01J21/04 ,  B01J35/40 ,  B01J35/56 ,  B01J35/61 ,  B01J35/63 ,  B01J35/64 ,  B01J35/66 ,  B01J37/02 ,  B01J37/08 ,  C07D301/04

    CPC classification number: B01J23/688 ,  B01J21/04 ,  B01J35/40 ,  B01J35/56 ,  B01J35/612 ,  B01J35/633 ,  B01J35/635 ,  B01J35/651 ,  B01J35/653 ,  B01J35/657 ,  B01J35/695 ,  B01J37/0213 ,  B01J37/082 ,  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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