PREPARATION OF PHTHALIC ANHYDRIDE BY GAS PHASE OXIDATION OF O-XYLENE
    21.
    发明申请
    PREPARATION OF PHTHALIC ANHYDRIDE BY GAS PHASE OXIDATION OF O-XYLENE 有权
    气相氧化制备邻苯二甲酸二异氰酸酯

    公开(公告)号:US20090198073A1

    公开(公告)日:2009-08-06

    申请号:US12301352

    申请日:2007-05-18

    IPC分类号: C07D317/46

    摘要: A process is described for preparing phthalic anhydride by catalytic gas phase oxidation of o-xylene. In, in a main reactor, a gaseous mixture of o-xylene and an oxygenous gas is passed through at least two reaction zones whose temperature can be controlled independently, and converted to a gaseous intermediate reaction product which comprises unconverted o-xylene, phthalic anhydride underoxidation products and phthalic anhydride, and the intermediate reaction product is introduced into a postreactor, wherein the temperature of the reaction zones in the main reactor is regulated in such a way that the concentration of unconverted o-xylene in the intermediate reaction product is at least 0.5% by weight. The process allows an increase in the overall yield of phthalic anhydride without or without significant deterioration in the product quality.

    摘要翻译: 描述了通过邻二甲苯的催化气相氧化制备邻苯二甲酸酐的方法。 在主反应器中,邻二甲苯和氧气的气态混合物通过至少两个反应区,其温度可独立控制,并转化成气态中间反应产物,其包含未转化的邻二甲苯,邻苯二甲酸酐 未反应产物和邻苯二甲酸酐,并将中间反应产物引入后反应器中,其中主反应器中反应区的温度调节为使中间反应产物中未转化的邻二甲苯的浓度至少为 0.5重量%。 该方法允许邻苯二甲酸酐的总产率提高,而不会产生质量的显着劣化。

    Preparation of phthalic anhydride by gas phase oxidation of o-xylene
    27.
    发明授权
    Preparation of phthalic anhydride by gas phase oxidation of o-xylene 有权
    通过邻二甲苯的气相氧化制备邻苯二甲酸酐

    公开(公告)号:US08153825B2

    公开(公告)日:2012-04-10

    申请号:US12301352

    申请日:2007-05-18

    IPC分类号: C07D307/89

    摘要: A process is described for preparing phthalic anhydride by catalytic gas phase oxidation of o-xylene, in, in a main reactor, a gaseous mixture of o-xylene and an oxygenous gas is passed through at least two reaction zones whose temperature can be controlled independently, and converted to a gaseous intermediate reaction product which comprises unconverted o-xylene, phthalic anhydride underoxidation products and phthalic anhydride, and the intermediate reaction product is introduced into a postreactor, wherein the temperature of the reaction zones in the main reactor is regulated in such a way that the concentration of unconverted o-xylene in the intermediate reaction product is at least 0.5% by weight. The process allows an increase in the overall yield of phthalic anhydride without or without significant deterioration in the product quality.

    摘要翻译: 描述了通过邻二甲苯的催化气相氧化制备邻苯二甲酸酐的方法,在主反应器中,邻二甲苯和氧气的气态混合物通过至少两个温度可独立控制的反应区 并转化为包含未转化的邻二甲苯,邻苯二甲酸酐未氧化产物和邻苯二甲酸酐的气态中间反应产物,将中间反应产物引入后反应器中,其中主反应器中的反应区的温度如此调节 在中间反应产物中未转化的邻二甲苯的浓度为至少0.5重量%的方式。 该方法允许邻苯二甲酸酐的总产率提高,而不会产生质量的显着劣化。

    Preparation of phthalic anhydride
    28.
    发明授权
    Preparation of phthalic anhydride 有权
    邻苯二甲酸酐的制备

    公开(公告)号:US07151184B2

    公开(公告)日:2006-12-19

    申请号:US10503983

    申请日:2003-02-04

    IPC分类号: C07D307/89

    摘要: Process for preparing phthalic anhydride by gas-phase oxidation of xylene, naphthalene or mixtures thereof in a shell-and-tube reactor thermostatted by means of a heat transfer medium over three or more different fixed-bed catalysts arranged in zones, wherein the process is carried out so that the maximum temperature in the second catalyst zone in the flow direction is up to 50° C. lower than the maximum temperature in the first catalyst zone and the maximum temperature in the third zone from the gas inlet is from 30 to 100° C. lower than that in the first catalyst zone.The process of the present invention makes it possible to prepare phthalic anhydride in high yields under industrially relevant conditions.

    摘要翻译: 在通过在三个或更多个不同的固定床催化剂上排列的区域中的传热介质进行恒温的壳管式反应器中通过气相氧化二甲苯,萘或其混合物来制备邻苯二甲酸酐的方法,其中该方法是 使得第二催化剂区域在流动方向上的最高温度比第一催化剂区域中的最高温度低至50℃,并且从气体入口处的第三区域中的最高温度为30至100℃ ℃,低于第一催化剂区域。 本发明的方法可以在工业上相关的条件下以高收率制备邻苯二甲酸酐。

    Method for producing maleic acid anhydride
    29.
    发明授权
    Method for producing maleic acid anhydride 有权
    马来酸酐生产方法

    公开(公告)号:US06803473B2

    公开(公告)日:2004-10-12

    申请号:US10220746

    申请日:2002-09-05

    IPC分类号: C07D30760

    摘要: In a process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of hydrocarbons having at least four carbon atoms using oxygen-containing gases in the presence of a volatile phosphorus compound over a catalyst comprising vanadium, phosphorus and oxygen in a shell-and-tube reactor unit having at least two successive cooled reaction zones, the temperature of the first reaction zone is from 350 to 450° C. and the temperature of the second and further reaction zones is from 350 to 480° C. and the temperature difference between the hottest reaction zone and the coolest reaction zone is at least 2° C.

    摘要翻译: 在使用含氧气体的挥发性磷化合物存在下,在包含钒,磷和氧的催化剂存在下,通过异构催化气相氧化具有至少四个碳原子的烃来制备马来酸酐的方法, 管式反应器单元具有至少两个连续冷却的反应区,第一反应区的温度为350-450℃,第二反应区和其它反应区的温度为350-480℃,温度差为 最热的反应区和最冷的反应区为至少2℃