
255Refining Processes for Used Oil Recycling to Base Oils or Fuels
Filter
storage
vessels
Hydrogenatio
reactor
Vacuum
dist.
column
Atmos.
dist.
column
(180
o
C)
Atmos.
dist.
column
(360
o
C)
Heater
Heater
Heater
Centrifuge
Used oil
Centrifuge
Hydrogen
Product
base oil
Sludge with
heavy metals
Water
and
solids
Water,
gasoline,
chlorinated
solvents
Gas oil
FIGURE 7.38 The CEA/CFR process. (From CEA/CFR US Patent 4,411,790.)