| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a terephthalic acid, having a catalyst collection process using a pyridine ring containing chelating resin and capable of immediately, simply analyzing concentration variation of a collected catalyst solution and stabilizing liquid phase oxidation reaction by reducing variation in concentration of a catalyst component and water in a catalyst preparation tank for returning the collected catalyst solution to obtain a terephthalic acid having stable quality.SOLUTION: A method for manufacturing a terephthalic acid includes analyzing each concentration of a cobalt ion, water, a manganese ion and a bromide ion in the collected catalyst solution by an infrared analyzer and a full automatic titration device online-connected to a predetermined place in the periphery of a collected catalyst solution tank. |
