FIELD: production of aromatic carboxylic acid. SUBSTANCE: aromatic carboxylic acids, for example, terephthalic acid, are prepared in special device. At least some parts of this device, especially those affected by acid medium at elevated temperature (higher 180 C) and at high pressure (8 bar), are manufactured of stainless duplex steel. EFFECT: improved efficiency of the method. 19 cl, 4 tbl
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