Produce 1,2,4-benzenetricarboxylic anhydride and 1,2, the method for 4,5-pyromellitic acid dianhydride

Produce 1,2,4-benzenetricarboxylic anhydride and 1,2, the method for 4,5-pyromellitic acid dianhydride

  • CN 85,104,128 A
  • Filed: 05/31/1985
  • Published: 11/26/1986
  • Est. Priority Date: 03/20/1984
  • Status: Abandoned Application
First Claim
Patent Images

1. , a kind of under liquid-phase condition, there are cobalt source, manganese source to add the bromine source, be with or without under the situation of zirconium source, under about 100-275 ℃

  • temperature, with molecular oxygen oxidation pseudocumol or durene, generate 1,2 respectively, 4-benzenetricarboxylic acid or 1,2,4, the method for 5-pyromellitic acid, this method are included in segmentation adding bromine composition at least two stages, wherein add about 35% of total bromine weight in the fs, and rest part added in the stage in the end, and wherein the temperature in the stage in the end rises to about 275 ℃

    by about 175 ℃

    , and the temperature of previous stage is between about 125-165 ℃

    .

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