Ikelic - Alliance Digital Repository

OIL SANDS
SOURCE: TOYO
FIGURE 1
HSC PROCESS FLOW DIAGRAM
CHARGE HEATER SOAKMQ DRUM FRACTIONATOR LOO STABILIZER GAS COMPRESSOR
STM
ft
z rr=
Feed Stock
STM
maintained in the soaker and throughout the
process even at a much higher conversion levels
than conventional visbreaking.
Coke-free operation at high conversion is made
possible by the following technical innovations to
conventional visbreaker concepts:
- Thermal
- High
- The
cracking takes place in a rela
tively large soaking drum under deep
steam stripping conditions.
turbulence in the liquid phase is
maintained by steam bubbles in the soak
ing drum.
multi-stage structure of the drum
minimizes back-mixing of the axial flow
of liquid.
The stability of the liquid in the soaker is sig
nificantly improved by deep steam stripping
3-15
Sour Gas
Crude Naphtha
HGO
LGO
HSC Residue
which minimizes the heavy
ponent remaining in the liquid phase.
cracked oil com
With these advantages, the HSC process has ver
satility in selecting cracking severity. The maxi
mum attainable severity of cracking, however, is
limited by viscosity of the cracked residue. When
the residue is to be utilized as liquid fuel oil, it is
generally recommended that the R&B softening
point of the residue be limited to under 100C.
Where a solidified residue is acceptable, such as
for burning in coal-fired boilers, the cracking
severity may be increased up to the limit where
the R&B softening point of the residue reaches
150C. At this cracking severity, the viscosity of
the residue at the HSC process temperature is
acceptable as a feedstock for gasification by par
tial oxidation process.
HSC-ROSE Combination
For more complete recovery of valuable oil
products from the bottom-of-the-barrel, an op-
THE SYNTHETIC FUELS REPORT, JANUARY 1995