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    • 5. 发明授权
    • Process for the preparation of pyromellitic dianhydride
    • 制备均苯四甲酸二酐的方法
    • US6084109A
    • 2000-07-04
    • US293275
    • 1999-04-16
    • Shiao-Jung ChuChian-Liang Hwang
    • Shiao-Jung ChuChian-Liang Hwang
    • C07D493/04B01J8/02B01J19/00B01J23/888B01J27/199B01J27/22B01J27/224B01J32/00C07C51/265C07D493/00
    • B01J27/199B01J23/888C07C51/265B01J2523/00
    • The present invention relates to a process for preparing pyromellitic dianhydride via an oxidation in gas phase under normal pressure. The process is characterized in that a catalyst system is used, which catalyst system comprises a catalyst which is a mixture of vanadium and tungsten oxides; a catalyst support comprising rutile and at least one material selected from the group consisting of tungsten carbide, silicon carbide and a mixture thereof; and a cocatalyst comprising oxides of manganese, antimony, bismuth, phosphorus, copper, aluminum, titanium or a mixture thereof, an oxide of an element of the VIIIB group of the periodic table, and an oxide of an alkali metal and/or alkaline earth metal. In this process, pyromellitic dianhydride is produced from a feedstream containing 1,2,4,5-tetraalkylbenzene in a gas flow rate of 4,000.about.12,000 hr.sup.-1 via a selective oxidation at 300.about.450.degree. C. in the presence of air which acts as an oxidant.
    • 本发明涉及在常压下通过气相氧化制备均苯四甲酸二酐的方法。 该方法的特征在于使用催化剂体系,该催化剂体系包含作为钒和氧化钨的混合物的催化剂; 包含金红石和选自碳化钨,碳化硅及其混合物中的至少一种材料的催化剂载体; 以及包含锰,锑,铋,磷,铜,铝,钛或其混合物的氧化物的助催化剂,周期表的VIIIB族元素的氧化物和碱金属和/或碱土金属的氧化物 金属。 在该方法中,在空气存在下,通过在300℃,450℃选择性氧化,以4,000分钟12,000小时-1的气体流速从含有1,2,4,5-四烷基苯的进料流中产生均苯四甲酸二酐。 作为氧化剂。