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    • 2. 发明专利
    • ES2112591T3
    • 1998-04-01
    • ES95113509
    • 1995-08-29
    • BASF AG
    • RUPPEL WILHELM DRWEGERLE ULRIKETENTEN ANDREAS DRHAMMON ULRICH DR
    • B01J8/06B01J21/02B01J23/16B01J23/28C07B61/00C07C51/25C07C57/04C07C57/055
    • A process for the catalytic gas-phase oxidation of acrolein to acrylic acid in a multiple contact tube fixed-bed reactor through whose space surrounding the contact tubes only one heat-exchange medium circuit is passed, at elevated temperature on catalytically active multimetal oxides with an acrolein conversion for a single pass of >/=95 mol % and an acrylic acid formation selectivity of >/=90 mol %, which comprises firstly passing the heat-exchange medium through the multiple contact tube fixed-bed reactor longitudinally, considered over the reaction container as a whole, to the contact tubes in cocurrent to the reaction-gas mixture and secondly superposing a transverse flow within the reaction container by means of an arrangement of successive baffles along the contact tubes which leaves passage cross sections free, so as to give a meandrous flow of the heat-exchange medium, seen in longitudinal section through the contact tube bundle, and setting the flow rate of the circulated heat-exchange medium so that its temperature rises by from 2 DEG to 10 DEG C. between the point of entry into the reactor and the point of exit out of the reactor.