Recent Trends in Fluid Catalytic Cracking Patents, Part VI: Regenerator
This is the sixth and final article in a review of patents in the area of Fluid Catalytic Cracking (FCC) for 2012-2013. The next article in this series will focus on FCC patents from 2014. The first five articles reviewed patents on catalyst additives, zeolites, cyclones, cracking catalysts and reactors. The current article will cover eight patents relating to FCC regenerators. Five of the eight patents relate to better mixing of the coked catalyst in the regenerator aimed at improving catalyst distribution, and permitting more even burning. These include systems to mix the coked catalyst with regenerated catalyst, systems to mix the coked catalyst with a carrier fluid, and systems to provide better mixing with combustion air. Of the three remaining patents, one relates to the use of a catalyst cooler, another relates to a fuel nozzle configuration for providing reactor heat demands for light feedstocks. The last relates to a two-step regenerator for operating at an increased level of coke on the catalyst. The accompanying reduced catalyst activity is useful for operating in a max-LCO mode.