| 摘要 |
The process for the cyclization of orthobenzoylbenzoic acid into anthraquinone comprising heating orthobenzoylbenzoic acid in the solid phase at a temperature between about 300 DEG C. to 400 DEG C. in the presence of a superactive bleaching earth. The invention also comprises a process for the separation of phthalic acid and any phthalic anhydride impurities from orthobenzoylbenzoic acid prior to its cyclization into anthraquinone through the use of said earth at a temperature from 200 DEG C. to 250 DEG C.
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