Purified Terephthalic Acid (PTA) is a type of aromatic dicarboxylic acid. It is a white powdered crystal under normal atmospheric temperature being characteristic of non-toxicity and inflammability. PTA is produced in two main process steps. The 1st step is an oxidation process of paraxylene as main raw material and using acetic acid as solvent. The product is called Crude Terephthalic Acid (CTA) as it significant amount of impurities. The 2nd step is is hydrogenation process of CTA to remove the impurities. The final product is called PTA.