| 摘要 |
PCT No. PCT/JP97/03908 Sec. 371 Date Jun. 30, 1998 Sec. 102(e) Date Jun. 30, 1998 PCT Filed Oct. 28, 1997 PCT Pub. No. WO98/18750 PCT Pub. Date May 7, 1998A process for producing an aromatic dicarboxylic acid by simple operations using a simple apparatus is disclosed, which enables to effect separation and washing of the product crystals efficiently without suffering from clogging of the apparatus, while permitting recovery of the reaction solvent and catalyst with permission of an efficient replacement of the solvent. According to the present invention, an aromatic dicarboxylic acid is produced by effecting, in the oxidation reactor 1, a liquid phase oxidation of an aromatic compound having substituent groups of alkyl(s) or partly oxidized alkyl(s) in a reaction solvent containing a catalyst with a molecular oxygen-containing gas, wherein the slurry containing the crystals of the aromatic dicarboxylic acid from a slurry receiver 4 or from a purification reactor 7 is introduced into a centrifuge 5a or 5b provided in its solid matter delivery zone with a filtering region to subject it to a centrifugation in order to separate it into the crystals and a separated liquid, whereupon the so-separated crystals are filtered in the filtering region on their way of travelling across the solid matter delivery zone while contacting them with a washing liquid and discharging the spent washing liquid from the filtering region.
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