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1. What is purified terephthalic acid? Purified terephthalic acid, the chemical formula is C8H6O4, is a white crystal at room temperature. It is one of the important derivatives of diphenyl ether and unsaturated acid. 2. Properties of purified terephthalic acid: The melting point of purified terephthalic acid is 300°C. It is difficult to dissolve in water and easily soluble in solvents such as ethanol, benzene and acetic acid. It has strong acidity and electrophilicity, and can undergo substitution reactions with some electrophilic reagents.