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本发明涉及精对苯二甲酸中生产过程中有色物的控制方法。其步骤分为氧化反应和加氢反应。氧化反应控制的方法是调整尾氧含量0.5%~8.0%(φ),反应停留时间30~120min,催化剂比例Co/Mn的摩尔比为0.25~3.33,Br/(Co+Mn)的摩尔比为0.1~10,钴的浓度为溶剂质量的150×10-6~2000×10-6;加氢反应控制的方法是调整温度在260~300℃和氢气分压在0.2~1.0MPa。按照本发明,生产工艺可根据加氢精制后pta指标要求,通过调整氧化中工艺参数(尾氧、停留时
The present invention relates to a method of controlling colored objects in the production of refined terephthalic acid. The steps are divided into oxidation reaction and hydrogenation reaction. The oxidation reaction control method is to adjust the tail oxygen content of 0.5% ~ 8.0% (φ), the reaction residence time of 30 ~ 120min, the catalyst ratio of Co / Mn molar ratio of 0.25 to 3.33, Br / (Co + Mn) molar ratio 0.1-10, and the concentration of cobalt is 150x10-6-2000x10-6. The method for controlling the hydrogenation reaction is to adjust the temperature at 260-300 DEG C and the hydrogen partial pressure at 0.2-1.0 MPa. According to the present invention, the production process according to pta index after hydrotreating requirements, by adjusting the oxidation process parameters (tail oxygen, stay