以对二甲苯为原料，液相氧化制得粗对苯二甲酸，经加氢处理、结晶、分离、干燥制得精制对苯二甲酸。精制对苯二甲酸是石油的下端。石油被加工成石脑油(也称为轻汽油)，从石脑油中提炼出MX(与二甲苯混合)和PX(对二甲苯)。以PX(65%-67%)为原料，乙酸为溶剂，制得精对苯二甲酸。然后加氢精制粗对苯二甲酸，除去杂质，然后结晶、分离、干燥，精制的对苯二甲酸产品，即成品对苯二甲酸。
Crude terephthalic acid was prepared by liquid-phase oxidation of p-xylene, and purified terephthalic acid was prepared by hydrogenation, crystallization, separation and drying. Purified terephthalic acid is the lower end of oil. Petroleum is processed into naphtha (also known as light gasoline), from which MX (mixed with xylene) and PX (p-xylene) are extracted. Purified terephthalic acid was prepared with PX (65% - 67%) as raw material and acetic acid as solvent. Then hydrofining crude terephthalic acid, removing impurities, crystallization, separation, drying, production of refined terephthalic acid products, that is, finished terephthalic acid.
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