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    • 56. 发明申请
    • PREPARATION OF PHTHALIC ANHYDRIDE BY GAS PHASE OXIDATION OF O-XYLENE
    • 气相氧化制备邻苯二甲酸二异氰酸酯
    • US20090198073A1
    • 2009-08-06
    • US12301352
    • 2007-05-18
    • Thomas MackewitzFrank RosowskiAndreas Tenten
    • Thomas MackewitzFrank RosowskiAndreas Tenten
    • C07D317/46
    • C07D307/89C07C51/265C07C63/16
    • 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.
    • 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。