215Refining Processes for Used Oil Recycling to Base Oils or Fuels
Filter
Filter
Separator
Separator
Usedoil
Water
treatment
Distillation
column
Extraction
column
Low-P
separator
Collec.
vessel
Heat
exchanger
High-P
separator
H
2
Mixer
Hydrogenation
reactor
Vacuum
distillation
column
Gasifier
Spindle
oil
Gas oil 2
Fuel
O
2
Cooler
H
2
O wash
Alk. wash
Water
Pump
Bleaching
clay
Gas oil 1 + water
Residue
cooled and
granulated
Heating
gas
Pump
Heat
exchanger
Tank
Exp.
vessel
Baseoil
Solids
Solvent
FIGURE 7.21 The Krupp Koppers process. (From Krupp Koppers Patent DE 36 02 586.)
216Refining Used Lubricating Oils
and water passes to a separator, the gas oil being taken to a gasier and the water being
ta ...
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