September 2018

Special Focus: Refining Technology

Additive solutions to SOx emissions in FCCUs

Sulfur oxide additives are typically based on hydrotalcite or magnesium aluminate spinel-type structures. Magnesium alumina is the pickup agent present in the most effective SOx additives on the market; therefore, to optimize SOx reduction, it is critical to maximize the amount of the critical magnesium component in the fluid catalytic cracking unit (FCCU) in an efficient and cost-effective way.

Genç, M., Dalgıç, E., Karani, U., Emiroglu, I., Er, I., Gül, A., Avcilar, S., Tüpraş; Ventham, T., Johnson Matthey Process Technologies

Sulfur oxide (SOx) additives are typically based on hydrotalcite [Mg6Al2(OH)18·4.5 H2O] or magnesium aluminate (MgAl2O4) spinel-type structures. Magnesium alumina is the pickup agent present in the most effective SOx additives on the market; therefore, to optimize SOx reduction, it is critical to maximize the amount of the critical magnesium component in the fluid catalytic cracking unit (FCCU) in an efficient and cost-effective way. SOx is captured by the SOx reduction additive in the FCC regenerator and released as hydrogen sulfide (H2S) in the reactor. Sulfur dioxide (SO2) and sulfur trioxide (SO3) exist in an equilibrium in an approximate ratio of 90:10 in full-burn regenerators. SO3 is

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