【摘 要】
：
PX (para-xylene) is an important organic raw material mainly used to produce PTA (purified terephthalicacid) and in tu to produce polyester (polyethylene glycol
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PX (para-xylene) is an important organic raw material mainly used to produce PTA (purified terephthalicacid) and in tu to produce polyester (polyethylene glycol terephthalate).
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