以對(duì)二甲苯為原料，液相氧化制得粗對(duì)苯二甲酸，經(jīng)加氫處理、結(jié)晶、分離、干燥制得精制對(duì)苯二甲酸。精制對(duì)苯二甲酸是石油的下端。石油被加工成石腦油(也稱為輕汽油)，從石腦油中提煉出MX(與二甲苯混合)和PX(對(duì)二甲苯)。以PX(65%-67%)為原料，乙酸為溶劑，制得精對(duì)苯二甲酸。然后加氫精制粗對(duì)苯二甲酸，除去雜質(zhì)，然后結(jié)晶、分離、干燥，精制的對(duì)苯二甲酸產(chǎn)品，即成品對(duì)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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