(e)
Major recognition features of lubricating oil refining (Figure 2-41)
include:
A processing area containing small pipe furnaces, fractionators, and large
rectangular buildings
A
storage area containing
a
large
number
of
small
to
medium-sized
cylindrical tanks
A packaging plant with large rectangular buildings and shipping facility
with transportation available.
Figure 2-41. Lubricating Oil Refining.
(8)
Delayed coking. Products of the delayed coking operation include coke,
gas-oil, gasoline, and light gases.
(a)
In the delayed coking process, residues from primary distillation are
redistilled in a fractionator. The oily residuum then goes through a pipe furnace
where it is heated into a hot liquid vapor mixture.
This is then routed into a
tall tank called a coke drum where petroleum coke precipitates.
(b)
The vapors are withdrawn from the top of the coke drum and piped back
into the fractionator where light gases, gasoline, and gas-oil are separated.
(c)
After about 24 hours of operation, the coke drum becomes filled with
coke.
The coke is then removed by means of a rotary drill and dropped into a
hopper or conveyor belt.
The gas-oil is fed to a cracking unit while the light
gases and gasoline are piped to a vapor recovery unit for separation.
IT 0673
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