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What is 4CBA about?

4-Carboxybenzaldehyde (4CBA) is a significant impurity formed during the oxidation of p-xylene to Purified Terephthalic Acid (PTA). Its presence in PTA is undesirable as it interferes with the polymerization of Polyethylene Terephthalate (PET), affecting its quality and properties. High-quality PTA should contain less than 25 ppm of 4CBA, with polymer-grade PTA ideally below 10 ppm, typically measured using High Performance Liquid Chromatography (HPLC).

Author

Shamol Bangla

Language

EN