The purpose of the fluid catalytic cracking unit (F.C.C.U.) in an oil refinery is
a) to receive the crude oil and recover more gas oils by further distilling under high temperature and low pressure
b) to remove the propane, butane, and light ends from the crude oil
c) to cause the heavy hydrocarbons to be transformed into lighter hydrocarbons
d) to remove the sulphur and nitrogen from the diesel
e) to remove the hydrogen sulphide and nitrogen from the naphtha
Answer: C