申请人:NIPPON SHOKUBAI CO., LTD.
公开号:US20020038039A1
公开(公告)日:2002-03-28
The present invention has for its object to provide a production method of pyromellitic anhydride of high purity in good yield at low cost by catalytic gas-phase oxidation of a 2,4,5-trialkylbenzaldehyde with the aid of a suitable catalyst system.
The present invention relates to a production method of pyromellitic anhydride comprising a step for catalytic gas-phase oxidation of a 2,4,5-trialkylbenzaldehyde with a molecular oxygen-containing gas in which said step for catalytic gas-phase oxidation is carried out in the presence of a catalyst such that a specific surface area of the catalytic active component thereof is not greater than 50 m
2
/g or in the presence of a catalyst containing vanadium as well as molybdenum and/or tungsten as a catalytic active component.
本发明的目的是提供一种通过催化气相氧化2,4,5-三烷基苯甲醛来制备高纯度吡啶二酐的生产方法,该方法在低成本下获得良好产率。本发明涉及一种吡啶二酐的生产方法,包括通过在分子氧气体存在下催化气相氧化2,4,5-三烷基苯甲醛的步骤,其中所述催化气相氧化的步骤是在存在催化剂的情况下进行的,该催化剂的催化活性组分的比表面积不大于50 m2/g,或者在含有钒以及钼和/或钨作为催化活性组分的催化剂的存在下进行。