Paraxylene, also known as PX or P-Xylene, is an aromatic hydrocarbon compound, derived particularly from benzene. Paraxylene is a colorless, toxic, sweet-smelling, and highly flammable chemical at room temperature . It is found naturally in petroleum and coal tar. Paraxylene or P-Xylene is an isomer of xylene compound, derived from benzene. Some of the other isomers of xylene include O-xylene and M-xylene. Paraxylene finds its largest application in large-scale manufacturing of terephthalic acid for polyester; also known as parylene. The production process of paraxylene is one of the most complicated among all the chemicals; simple crystallization of the xylene normally led to complex purification process owing to the formation of eutectic mixtures . It is manufactured by catalytic reforming of naptha, a petroleum derivative, and separated in a series of adsorption or crystallization, distillation, and reaction processes from ethyl benzene, o-xylene, and m-xylene. The melting point of Paraxylene is highest among other isomers of xylene.