| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing terephthalic acid in high production efficiency, which inhibits foaming of a reaction liquid containing DMT, MMT and terephthalic acid and sublimation of DMT in a hydrolysis reaction tank, prevents clogging in a vent line in a method for producing terephthalic acid from DMT by hydrolysis. SOLUTION: In the method for producing terephthalic acid by hydrolyzing dimethyl terephthalate in a hydrolysis reaction tank, a gas containing methanol generated from the hydrolysis reaction tank is removed by piping connected to a part above the reaction liquid level of the hydrolysis reaction tank and pure water in an amount of≥1 pt.wt. based on 10 pts.wt. of dimethyl terephthalate supplied to the hydrolysis reaction tank or water containing impurities equal to or lower than solubility at a hydrolysis reaction temperature is supplied from a part above the reaction liquid level of the hydrolysis reaction tank to the hydrolysis reaction tank. COPYRIGHT: (C)2011,JPO&INPIT
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