Moving bed catalytic cracker

Figure 19. Moving bed catalytic crackers (A) Thermoform moving bed process (B) Houdry catalytic cracking process.

Figure 20. Catalyst pick-up system for a moving bed catalytic cracker.

A cyclone outside the moving-bed catalytic colnmn serves to sort only catalyst particles of a desired size among the catalyst particles dropped to the lower portion. A nickel-molybdenum catalyst regenerator with an air injector serves to regenerate the catalyst transferred from the cyclone and the regenerated catalyst is then returned to the moving-bed catalytic cracker [29],... 

Figure 17.28. Reactors with moving beds of catalyst or solids for heat supply, (a) Pebble reactor for direct oxidation of atmospheric nitrogen two units in parallel, one being heated with combustion gases and the other used as the reactor (Ermenc, (1956). (b) Pebble heater which has been used for making ethylene from heavier hydrocarbons (Batchelder and Ingols, 1951). (c) Moving bed catalytic cracker and regenerator for 20,000 bpsd the reactor is 16 ft dia, catalyst circulation rate 2-7 Ibs/lb oil, attrition rate of catalyst 0.1-0.5 Ib/ton circulated, pressure drop across air lift line is about 2psi (L. Berg, in Othmer, 1956).

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