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    • 10. 发明公开
    • Process for the production of trimellitic acid
    • Verfahren zur Herstellung vonTrimellitsäure
    • EP1728778A1
    • 2006-12-06
    • EP05425324.0
    • 2005-05-13
    • LONZA S.P.A.
    • Castiglioni, Gian Luca.Pirola, Roberto.Fumagalli, Carlo.
    • C07C51/265C07C63/307
    • C07C51/265C07C63/307
    • Trimellitic acid is produced by oxidation of pseudocumene in acetic acid at temperatures between 130 and 240 °C in the presence of a catalyst composition containing cobalt, manganese and bromine. The process comprises the stages of
      (i) simultaneously feeding pseudocumene and air or an oxygen-containing gas into a solution containing acetic acid and the catalyst composition, at an addition rate resulting in an oxygen concentration in the off-gas of less than 8 vol%, and at a temperature and a pressure sufficient to result in 5 to 25 mol% of the total amount of oxygen required to oxidize the pseudocumene to trimellitic acid being consumed, and
      (ii) feeding air or an oxygen-containing gas into the reaction mixture obtained in stage (i) until essentially all of the pseudocumene has been consumed and a molar yield of trimellitic acid of at least 90% has been obtained.
      There is no supplementation of catalyst after stage (i).
    • 在含有钴,锰和溴的催化剂组合物的存在下,在130-240℃的温度下,在乙酸中氧化假枯烯来制备偏苯三酸。 该方法包括以下阶段:(i)同时将假阳离子和空气或含氧气体同时地加入到含有乙酸和催化剂组合物的溶液中,加入速率导致废气中的氧浓度小于8vol %,并且在足以导致将假枯烯氧化成偏苯三酸被消耗所需的氧的总量的5至25mol%的温度和压力下,和(ii)将空气或含氧气体进料到反应中 在步骤(i)中获得的混合物直到基本上所有的假枯烯已被消耗,并且已经获得至少90%的偏苯三酸的摩尔收率。 在阶段(i)之后没有催化剂的补充。