Topsøe’s FCC pretreatment technology is designed to treat a wide variety of feedstocks ranging from gasoils through heavy-vacuum gas oils and coker streams to resids. This pretreatment process can maximize FCC unit performance.
The processing objectives range from deep desulfurization for meeting gasoline-sulfur specifications from the FCC products, to denitrogenation and metals removal, thus maximizing FCC catalyst activity. Additional objectives can include Conradson carbon reduction and saturation of polyaromatics to maximize gasoline yields.
The Topsøe FCC Pretreatment technology combines understanding of kinetics, high-activity catalysts, state-of-the-art internals and engineering skills. The unit can be designed to meet specific processing objectives in a cost-effective manner by utilizing the combination of processing severity and catalyst activity.
Topsøe has experience in revamping moderate- to low-pressure units for deep desulfurization. Such efforts enable refiners to directly blend gasoline produced from the FCC and meet future low-sulfur (less than 15 ppm) gasoline specifications.
An additional option is Topsøe’s Aroshift process that maximizes the conversion of polyaromatics which can be equilibrium limited at high operating temperatures. The Aroshift process increases the FCC conversion, and the yield of gasoline and C3 /C4 olefins, while reducing the amount of light- and heavy-cycle oil. Furthermore, the quality of the FCC gasoline is improved.
Topsøe has a wide variety of catalysts for FCC pretreatment service. The catalyst types cover TK-558 BRIM, a CoMo catalyst with high desulfurization activity, and TK-559 BRIM, a NiMo catalyst with hydro desulfurization and high hydrodenitrogenation activity. Topsøe offers a wide range of engineering scopes from full scoping studies, reactor design packages and process design packages to engineering design packages.
Operating conditions: Typical operating pressures range from 60 to 125 bar (900 to 1,800 psi), and temperatures from 300°C to 430°C (575°F to 800°F).
Licensor: Haldor Topsøe A/S.