| 摘要 |
There is provided an improvement in the process for the preparation of terephthalic acid by the oxidation of paraxylene in solution in acetic acid, in the presence of a catalyst comprising manganese, cobalt and elemental bromine, wherein the terephthalic acid is separated from the mother liquor, at least a portion of said mother liquor being partially anhydrified. The improvement comprises forming an admixture of acetic acid, manganese or a manganese compound, elemental bromine and a soluble cobalt compound, wherein the elemental bromine is added in the presence of a reducing agent, and feeding the admixture comprising the acetic acid, manganese or a manganese compound, elemental bromine and dissolved cobalt compound to an oxidation zone. |
