A baffle-style stripper for an FCC process comprising sloped baffles in
which a greater volumetric flow rate of stripping medium permeates
openings in a bottom section of the baffle than through a top section of
the baffle for low catalyst flux stripping operations. When low catalyst
flux is used, the catalyst runs from baffle to baffle closer to the bottom
edge of the baffle. Hence, more fluidization from stripping medium is
concentrated near the lower edge of the baffle. The greater fluidization
at the bottom section of the baffle is accomplished by providing greater
opening area per baffle area in the lower section of the baffle than in
the top section of the baffle.
