DESIGN OF PRODUCTION PROCESS OF PARAXYLENE NAPHTHA

Abstract

The utilization of naphtha obtained from plastic waste and refinery holds immense potential for closing the loop on plastics and controlling the entire value chain in Pakistan. This research aims to harness indigenous raw materials to produce highly purified para-xylene for the local industry. The methodology employed involves catalytic reforming of naphtha to convert paraffins and naphthalene into aromatic compounds such as benzene, toluene, and xylenes. The xylene stream is further purified through freezing point differentiation of meta, ortho, and para isomers. The toluene produced in the process is subsequently used in a toluene methylation unit, where it reacts with methanol to yield additional paraxylene. The research also incorporates the use of Aspen Suite for project simulation, employing traditional equipment design strategies for heat exchangers, distillation columns, furnaces, reactors, flash vessels, and other essential equipment. The process design benefits from the utilization of EDR (Equipment Design Rating) from Aspen Plus. The key findings of the study demonstrate the successful production of 644 tons of paraxylene per day, utilizing readily available and affordable naphtha. This indigenous production not only creates a secure and stable supply chain for para-xylene within Pakistan's petrochemical and polymer industry but also reduces dependence on imports. The implications of this research are significant, as it showcases the profitability and viability of indigenous para-xylene production. By tapping into readily available and inexpensive naphtha, Pakistan can achieve self-sufficiency in para-xylene, enhancing the domestic petrochemical sector and reducing reliance on external sources. In conclusion, this project highlights the design and optimization of a para-xylene production process from naphtha. The findings demonstrate the economic viability and importance of local production, paving the way for a secure and sustainable supply chain for para-xylene in Pakistan's petrochemical and polymer industry.