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    • 23. 发明授权
    • Method for producing maleic anhydride
    • US07087767B2
    • 2006-08-08
    • US10522993
    • 2003-07-22
    • Jens WeigunyWilhelm RuppelMark Duda
    • Jens WeigunyWilhelm RuppelMark Duda
    • C07D307/60
    • C07D307/60
    • Process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of hydrocarbons having at least four carbon atoms by means of oxygen-containing gases at from 350 to 500° C. in the presence of a volatile phosphorus compound over a vanadium-, phosphorus- and oxygen-containing catalyst in a shell-and-tube reactor unit having at least one reaction zone cooled by means of a heat transfer medium, in which the temperature and/or the amount of the heat transfer medium flowing into the first (relative to the feed direction) reaction zone are set so that the mean temperature of the heat transfer medium in the first reaction zone TSB(1st zone), which is calculated as the mean of the inflow temperature and the outflow temperature of the heat transfer medium, is in accordance with the formulae (I) and (II) TSB(1st zone)≦TR(1st zone)−TSafety(1st zone)  (I) TSB, Ymax(1st zone)−TA(1st zone)≦TSB(1st zone)≦TSB, Ymax(1st zone)+TB(1st zone),  (II) where TR(1st zone) is the runaway temperature of the first reaction zone; TSafety(1st zone) is the safety temperature of the first reaction zone and has a value of 1° C.; TSB, Ymax(1st zone) is the mean temperature of the heat transfer medium in the first reaction zone at which the maximum maleic anhydride yield is achieved in the range TSB(1st zone)≦TR(1st zone); TA(1st zone) is 20° C.; and TB(1st zone) is 10° C.
    • 30. 发明授权
    • Catalytic gas-phase oxidation of propene to acrolein
    • 丙烯催化气相氧化成丙烯醛
    • US5821390A
    • 1998-10-13
    • US525011
    • 1995-09-08
    • Wilhelm RuppelUlrike WegerleAndreas TentenUlrich Hammon
    • Wilhelm RuppelUlrike WegerleAndreas TentenUlrich Hammon
    • B01J23/88B01J8/06B01J21/02B01J23/16B01J23/887B01J27/132B01J27/192C07B61/00C07C45/35C07C47/22
    • B01J27/192B01J23/8876B01J8/067C07C45/35B01J2208/00212B01J2208/00221B01J2219/00777
    • A gas-phase mixture of propene and oxygen is catalytically oxidized by passing a reactant gas mixture comprising propene and oxygen through a plurality of catalyst containing contact tubes in a fixed bed reactor and simultaneously passing only one heat-exchange medium at elevated temperature over the exterior surfaces of the contact tubes in a longitudinal flow pattern which is cocurrent with the direction of flow of the reactants through said tube; simultaneously superposing a transverse flow on said longitudinal flow of heat exchange medium by means of an arrangement of successive baffles along the contact tubes which leave passage cross-sections free, thereby resulting in a meandrous flow of the heat-exchange medium through the reactor and setting the flow rate of said heat-exchange medium so that its temperature between the point of entry of the medium into the reactor and its point of exit increases by 2.degree. to 10.degree. C.; and obtaining product acrolein at a selectivity .gtoreq.85 mol % from the reactor at a single pass propene conversion .gtoreq.90 mol %.
    • 丙烯和氧气的气相混合物通过在固定床反应器中通过包含丙烯和氧气的反应气体混合物通过多个含有接触管的催化剂催化氧化,同时仅使一个热交换介质在高温下通过外部 接触管的表面以与通过所述管的反应物的流动方向并流的纵向流动图案; 同时通过沿着接触管的连续挡板的布置使横向流在所述纵向流动的热交换介质上,使得通道横截面自由,从而导致热交换介质通过反应器的蜿蜒流动和设定 所述热交换介质的流速使得其进入反应器的入口点和其出口点之间的温度升高2℃至10℃; 并且在单次丙烯转化率为90摩尔%时,以反应器的选择性> 85%摩尔得到产物丙烯醛。