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    • 1. 发明授权
    • Process for producing maleic anhydride
    • 马来酸酐生产工艺
    • US4760153A
    • 1988-07-26
    • US842934
    • 1986-03-24
    • Youjirou TakahashiJunichi ToyodaToshimasa KushiharaIkuo KurimotoShigemi OsakaYoshiyuki Nakanishi
    • Youjirou TakahashiJunichi ToyodaToshimasa KushiharaIkuo KurimotoShigemi OsakaYoshiyuki Nakanishi
    • B01J27/199B01J35/00C07C51/31C07D307/60
    • B01J23/002B01J27/199B01J35/0006C07C51/313B01J2523/00
    • An improved process for producing maleic anhydride which comprises catalytically oxidizing benzene with a molecular oxygen-containing gas in the vapor phase in a multitubular heat-exchanger-type reactor. The process is characterized in thata catalyst-packed layer of the reactor is divided into a gas inlet side layer and a gas outlet side layer,the activity of the gas inlet side layer is controlled by adding at least one component selected from the group consisting of potassium, cesium, thallium and rubidium as a promoter or by decreasing the amount of phosphorus pentoxide (P.sub.2 O.sub.5) to be added in the catalytically active substance containing vanadium pentoxide, molybdenum trioxide and sodium oxide, andthe activity of the gas outlet side layer is increased by decreasing the amount of at least one component selected from the group consisting of potassium, cesium, thallium, rubidium, magnesium, calcium, strontium and barium or by not adding such a component from that in the catalyst, or by increasing the amount of phosphorus pentoxide (P.sub.2 O.sub.5) from the gas inlet side catalyst.
    • 一种生产马来酸酐的改进方法,其包括在多管式热交换器型反应器中在气相中用分子氧气体催化氧化苯。 该方法的特征在于将反应器的催化剂填充层分成气体入口侧层和气体出口侧层,通过加入至少一种选自以下的组分来控制气体入口侧层的活性: 钾,铯,铊和铷作为助催化剂或通过减少含有五氧化二钒,三氧化钼和氧化钠的催化活性物质中添加的五氧化二磷(P 2 O 5)的量,气体出口侧层的活性为 通过减少选自钾,铯,铊,铷,镁,钙,锶和钡中的至少一种成分的量来增加,或者不将这样的成分从催化剂中添加,或者通过增加 来自气体入口侧催化剂的五氧化二磷(P 2 O 5)。
    • 2. 发明授权
    • Method for preparing pyromellitic acid and/or pyromellitic anhydride
    • 制备均苯四酸和/或均苯四酸酐的方法
    • US4665200A
    • 1987-05-12
    • US841833
    • 1986-03-20
    • Yoshiyuki NakanishiYoji AkazawaIkuo KurimotoYoujirou TakahashiShinichi UchidaHisashi Yoshikawa
    • Yoshiyuki NakanishiYoji AkazawaIkuo KurimotoYoujirou TakahashiShinichi UchidaHisashi Yoshikawa
    • B01J23/00B01J23/20B01J35/02B01J37/02C07C51/265C07D307/89
    • C07C51/265B01J23/002B01J23/20B01J2523/00B01J35/026B01J37/0223
    • In a method for the preparation of pyromellitic acid or its anhydride by catalytic vapor phase oxidation of a tetra-C.sub.1 -C.sub.4 -alkylbenzene using a catalyst comprising catalytically active material composed of 1 to 20 parts by weight of V.sub.2 O.sub.5, 99 to 80 parts by weight of TiO.sub.2 and/or SnO.sub.2 and/or ZrO.sub.2, and per one hundred parts by weight of V.sub.2 O.sub.5, TiO.sub.2 and/or SnO.sub.2 and/or ZrO.sub.2 0.02 to 10 parts by weight, calculated as P.sub.2 O.sub.5, of a phosphorus compound, 0.01 to 5 parts by weight, calculated as Nb.sub.2 O.sub.5, of a niobium compound, 0 to 1.2 parts by weight, calculated as oxide, of at least one metal selected from the group consisting of potassium, cesium, rubidium and thallium, and 0 to 10 parts by weight, calculated as Sb.sub.2 O.sub.3, of an antimony compound, and an inert carrier supporting said catalytically active material thereon, the improvement in which said catalyst is divided into at least two layers, a layer on the gas inlet side and a layer on the gas outlet side, and (i) the content of potassium, cesium, rubidium or thallium is higher in the catalyst layer on the gas inlet side than in the catalyst layer on the gas outlet side, or (ii) the content of the phosphorus compound is lower in the catalyst layer on the gas inlet side than in the catalyst layer on the gas outlet side, or (iii) the surface area of TiO.sub.2 and/or SnO.sub.2 and/or ZrO.sub.2 is lower in the catalyst layer on the gas inlet side than in the catalyst layer on the gas outlet side.
    • 在通过使用包含由1-20重量份V 2 O 5组成的催化活性材料的催化剂四丁基-C1-烷基苯的催化气相氧化制备1,2,4,5-苯四酸或其酸酐的方法中,99至80重量份 的TiO 2和/或SnO 2和/或ZrO 2,并且每100重量份的V 2 O 5,TiO 2和/或SnO 2和/或ZrO 2为0.02至10重量份,以P2O5计,磷化合物为0.01至5重量份 以Nb 2 O 5计,铌化合物,0〜1.2重量份(以氧化物计)为至少一种选自钾,铯,铷和铊的金属,0〜10重量份, 以锑化合物计,锑化合物和负载其上的催化活性物质的惰性载体,其中所述催化剂分为至少两层,气体入口侧的层和气体出口侧的层的改进, 和(i)钾,铯,r的含量 氦或铊在气体入口侧的催化剂层中高于气体出口侧的催化剂层,或者(ⅱ)在气体入口侧的催化剂层中的含量比在催化剂中低 或(iii)在气体导入侧的催化剂层中,与气体出口侧的催化剂层相比,TiO 2和/或SnO 2和/或ZrO 2的表面积较低。