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    • 6. 发明公开
    • VERFAHREN ZUR HERSTELLUNG VON MALEINS UREANHYDRID
    • 用于生产马来酸酐
    • EP1529039A2
    • 2005-05-11
    • EP03784039.4
    • 2003-07-22
    • BASF AKTIENGESELLSCHAFT
    • WEIGUNY, JensRUPPEL, WilhelmDUDA, Mark
    • C07D307/60
    • C07D307/60
    • The invention relates to a method for producing maleic anhydride by the heterogeneous catalytic gas phase oxidation of hydrocarbons comprising at least four carbon atoms with gases containing oxygen, in the presence of a volatile phosphorus compound, on a catalyst containing vanadium, phosphor and oxygen in a multitube flow reactor unit with at least one reaction zone that is cooled by a heat-transfer medium, at a temperature ranging between 350 and 500 °C. In the first reaction zone, in relation to the educt supply, the supply temperature and/or the supply quantity is set in such a way that the average temperature of the heat transfer medium in the first reaction zone TSB(1st zone), said temperature being produced by the average value formation of the supply temperature and the drainage temperature of the heat-transfer medium, fulfils the formulas (I) and (II): (I) TSB(1st zone) ≤ TD(1st zone) - TSafety(1st zone); (II) TSB,Amax(1st zone) - TA(1st zone) ≤ TSB(1st zone) ≤ TSB,Amax(1st zone) + TB(1st zone), whereby TD(1st zone) represents the throughput temperature of the first reaction zone, TSafety(1st zone) represents the safety temperature of the first reaction zone and is 1 °C; TSB,Amax(1st zone) represents the average temperature of the heat-transfer medium in the first reaction zone, the maximum yield of maleic anhydride being obtained in the range TSB(1st zone) ≤ TD(1st zone), TA(1st zone) is 20 °C and TB(1st zone) is 10 °C.