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Fluid cracking crackers ( FCC ) . FCC reactors are among the largest pro - cessing units used in the petroleum industry. Figure P 1

Fluid cracking crackers (FCC). FCC reactors are among the largest pro-
cessing units used in the petroleum industry. Figure P1.3 shows an example
of such units. A typical unit is 4-10m ID and 10-20 m high and contains
about 50 tons of =800kgm3 porous catalyst. It is fed about 38000 barrels
of crude oil per day day at a density {:~=900kgm3), and it cracks
these long chain hydrocarbons into shorter molecules.
To get an idea of the rate of reaction in these giant units, let us simplify
and suppose that the feed consists of just C20 hydrocarbon, or
If 60% of the vaporized feed is cracked in the unit, what is the rate of
reaction, expressed as -r'(mols reacted/kg cat {:-s) and as rm(mols reacted/
m3 cat s)?
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