AM-05-21 Additives Achieve Ultra-Low FCCU Emissions

Description:

In this paper we will review the fundamental chemistry of SOx additives and examine several commercial units that successfully used SOx additives to achieve less than 25 ppm from uncontrolled emissions as low as 65 ppm to as high as 800 ppm. The chemistry of NOx formation is more complex than that of SOx and highly influenced by the design, operation, and conditions in the regenerator. Therefore, NOx additive performance varies from unit to unit. Commercial examples demonstrate that significant NOx reductions, at times in excess of 75%, can be achieved with both low-NOx CO combustion promoters and NOx additives. In addition, we will also introduce new additive technologies for both full burn and partial burn units promising greater and more consistent NOx reduction. Furthermore, we will address the possible impact of NOx additive base loading protocol on yields and the concerns refiners have over activity dilution when using large amounts of additives.