Fluid cracking downflow

Fig. 32. Fluid cracking unit—downflow design. [Courtesy of Standard Oil Company (Indiana).]...

The 100 /D plant was again rebuilt to demonstrate the downflow operation in 1941, and simultaneously five more large scale plants of this type were under construction by Exxon, the first of which started operating in mid 1943. Figure 7 shows the Fluid Cracking units at the Baton Rouge refinery. 

Figure 7. The First Commercial Fluid Catalytic Cracking Plants at Baton Rouge, LA. PCLA 1 at left and at right are two of downflow designs.

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