Recent advances in the technology have been directed to expanding the feedstock types that can be processed. Successfully run feeds now include:
• VGO
• Hydrotreated VGO
• Deasphalted oil
• Dewaxing wax
• Coker gas oil
• Atmospheric resid
BLOWER
REGENERATOR
TO GAS
RECOVERY
REACTOR
STRIPPING STEAM
SLURRY RECYCLE
RISER STEAM
FRESH FEED
TO FLUE GAS
SYSTEM
Fig. 29 DCC process
Table 18 DCC operation
with naphtha recycle (Jinan
DCC unit)
Naphtha recycle
No
Yes
Products (wt%)
Dry gas
6.8
7.5
LPG
39.2
43.9
Naphtha
27.8
20.9
LCO
16.8
18.2
Coke
8.9
9.0
Loss
0.5
0.5
Olefin yield
Propylene
17.4
21.0
Butylene
12.4
13.2
Fluid Catalytic Cracking (FCC) in Petroleum Refining
301