| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an aromatic carboxylic acid with which energy possessed by a separation mother liquor is effectively utilized and an active component dissolved in the mother liquor is effectively recovered when the separated mother liquor obtained by carrying out solid-liquid separation of an oxidation reaction slurry in a high-temperature and a high-pressure state at the high temperature under the high pressure is treated in the method for producing the aromatic carboxylic acid from an alkyl aromatic compound. SOLUTION: A pressure state above atmospheric pressure pressurized in an oxidation step is retained in steps thereafter in production steps of the aromatic carboxylic acid having the oxidation step (11), a recovery step (14), recycling steps (H and I) and concentrating steps (16, 17 and 18). The pressure is utilized in concentration (16) in the concentrating steps. In the concentrating steps, a solvent T in the mother liquor I is evaporated without carrying out heating, compressing, etc. COPYRIGHT: (C)2005,JPO&NCIPI
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