The purpose of the vacuum unit in an oil refinery is
a) to receive the "reduced crude" and recover more gas oils by further distilling under high temperature and low pressure
b) to only take off the propane, butane, and light ends from the crude oil
c) the same as the fluid catalytic cracking unit
d) to remove the hydrogen sulphide and nitrogen from the naphtha
e) to remove the sulphur and nitrogen from the diesel
Answer: A