| 초록 |
Crude oil is mainly composed of hydrocarbons, however also containing small amount of sulfur, nitrogen and metals. The presence of metals such as Ni, V, Fe, and Cu could affect the activity of catalysts resulting in an increase of gas and coke formation and reducing yields of gasoline. These transition metals are not eliminated during the naphtha cracking process, and remain in the part of heavy residues. Consequently, nickel and vanadium concentrated mainly in the residue during the catalytic cracking process, are deposited on the catalyst, leading to catalytic poisoning. In this research, the elimination of transition metals such as nickel and vanadium from the vacuum residual oil has been studied by solvent distillation and chitosan sequestering process. The solvent separation process is capable of removing all or a substantial amount of metals from the vacuum residues that are destined for further processing such as in the middle of refining step. |
