Process for the preparation of aromatic dicarboxylic acids

一种芳香族二羧酸的制造方法，所述方法系在反应溶剂中，有催化剂存在时，将具有烷基取代基或部分氧化的烷基取代基的芳香族化合物用含有分子状氧的气体液相氧化，然后将含有所得之芳香族二羧酸结晶的浆料进行固液分离，从而回收结晶，在所述芳香族二羧酸的制造方法中，将上述浆料连续供给到内部配置了螺旋输送机的滤网型离心分离机进行固液分离时，作为滤网型离心分离机的滤网，是采用使所供给的浆料中的部分结晶从网孔漏泄的开孔滤网。若采用本方法，可防止离心分离机的网孔堵塞，有效地进行固液分离。 A process for producing aromatic dicarboxylic acids which comprises subjecting an aromatic compound having an alkyl substituent or a partially oxidized alkyl substituent to liquid-phase oxidation with a molecular oxygen-containing gas in a reaction solvent in the presence of a catalyst, then conducting solid-liquid separation of the formed slurry containing crystals of the produced aromatic dicarboxylic acid, and recovering the crystals, wherein when carrying out solid-liquid separation of the slurry by continuously supplying it to a screen-type centrifugal separator having a screw conveyor disposed therein, a screen with an opening size that allows partial escape of crystals in the supplied slurry through the screen openings is used as the screen of the screen-type centrifugal separator. According to this method, clogging of the centrifugal separator is prevented and solid-liquid separation can be carried out efficiently.