Study of Reducing the Amount of Green Oil in the CCR Plant of Oil Refinery Unit

Crude oil refining is performed to produce more high valuable cuts. In the meantime, gasoline cuts are considered as one of the suitable value-added products. Naturally, the production of gasoline has become a vital issue due to various issues in the country. Today, some CCR plants are under the control of green oil generation. Green oil is a viscous fluid that has a high boiling point which sediments inside pipes, compressors and reactors, disrupting the process operation. It also poisons the catalysts of various units. Green oil is a combination of long-chain polymerized molecules that generated via polymerizing hydrocarbon chloride compounds or polymerizing these compounds with unsaturated compounds. In this study, the purpose is to investigate ways to reduce green oil production using a hierarchical analysis process. The process of hierarchical analysis is a decision-making method based on various criteria for achieving logical results, which has been done with the help of Expert Choice software. Cost, technical feasibility study, efficiency and availability have been chosen as criteria for this process. Also, three activated alumina adsorbents, enhanced alumina and the hybrid of carbon fiber and activated carbon were selected as hierarchical analysis processes alternatives. The paired comparison of criteria and three possible alternatives indicated that the hybrid of carbon fiber and activated carbon alternative was selected as the best adsorbent with 35.3% priority over other adsorbents. Also, the cost and availability criteria had 32.6% and 28.4% priority, respectively.