Energy is essential in all human activities, including industrial development, commerce, telecommunication, engineering, and medicine, to name a few. Currently, petroleum contributes 31.2% of the total energy consumed globally. The petroleum refinery converts crude oil into various useful products, including but not limited to fuel for powering engines and machinery. A petroleum refinery's complexity is determined by several factors, including the targeted product(s), crude quality, integration with the petrochemical unit, economics, environmental management issues, feed availability, product market, and others. Considering those mentioned earlier, the choice of products or targeted products has the most significant influence on refineries' complexity.

Keywords : Refinery, Petroleum, Petroleum Products, Crude Oil, Distillation, Hydro Skimming