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    The method of heterogeneously catalyzed partial gas phase oxidation of propylene to form the acrylic acid
    11.
    发明专利
    The method of heterogeneously catalyzed partial gas phase oxidation of propylene to form the acrylic acid 有权

    公开(公告)号：JP5361393B2

    公开(公告)日：2013-12-04

    申请号：JP2008546369

    申请日：2006-12-11

    Applicant: ビーエーエスエフ ソシエタス・ヨーロピアBasf Se

    Inventor： ディーテルレ マルティン ,  ハイレク イェルク ,  ヨアヒム ミュラー−エンゲル クラウス

    IPC: C07C51/25 ,  C07B61/00 ,  C07C51/43 ,  C07C57/05

    CPC classification number: C07C51/252 ,  B01J23/002 ,  B01J2523/00 ,  C07C45/35 ,  C07C51/43 ,  C07C47/22 ,  C07C57/04 ,  B01J2523/54 ,  B01J2523/68 ,  B01J2523/842 ,  B01J2523/17 ,  B01J2523/55 ,  B01J2523/69 ,  B01J2523/13 ,  B01J2523/41 ,  B01J2523/845

    Abstract: Heterogeneously catalyzed partial gas phase oxidation of propylene to acrylic acid comprises introducing a reaction gas initial mixture (1) into a first reaction zone; reducing the temperature of the product gas mixture (1) by direct and/or indirect cooling, and adding a secondary gas to the product gas mixture (1); and subsequently introducing the product gas mixture (1), into a second reaction stage; and subsequently transferring the product gas mixture (2) containing acrylic acid in a first separation zone into the condensed phase and subsequently in a second separation zone. Heterogeneously catalyzed partial gas phase oxidation of propylene to acrylic acid comprises introducing a reaction gas initial mixture (1) containing propylene and molecular oxygen in a molar ratio of >=, 1 and at least an inert dilution gas in a first reaction stage, into a first reaction zone through at least a first catalyst bed at increased temperature, where the catalyst exhibit at least a multi-metal oxide (A) containing molybdenum, iron and bismuth as active mass, such that the propylene conversion during a single passage through the catalyst bed is >= 90 mol.% and the resulting selectivity of the acrolein- and acrylic acid by-product- formation is >= 80 mol.%; reducing the temperature of the product gas mixture (1) from the first reaction stage by direct and/or indirect cooling, and adding a secondary gas in the form of molecular oxygen and/or inert gas to the product gas mixture (1); and subsequently introducing the product gas mixture (1) as a reaction gas initial mixture (2) containing molecular oxygen and acrolein in a molar ratio of >= 0.5 and at least an inert dilution gas, in a second reaction stage at increased temperature by at least a second catalyst bed, whose catalysts exhibits multi-metal oxide (A1) containing at least an molybdenum and vanadium as active mass in such a way that the acrolein conversion during a single passage through the catalyst bed is >= 90 mol % and the selectivity of the acrylic acid formation over both the reaction stages is >= 70 mol %, with respect to converted propylene; subsequently transferring the product gas mixture (2) containing acrylic acid in a first separation zone into the condensed phase and subsequently in a second separation zone, where: the acrylic acid is separated from the condensed phase by application of at least a thermal separation process comprising at least a crystallization separation of the acrylic acid, and the reaction gas initial mixture (1) contains cyclopropane (up to 3 mol.%), with respect to the propylene.

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