Material balance for the unit in this service is shown in Table 24.
The FCCU process. From licensor data, the following are the expected yields
from the desulfurized feed:
Gas C 2 to C 3
8.1 % vol on feed
C 3
2.3 % vol
C 3 =
5.6 % vol
iC 4
2.8 % vol
nC 4
1.4 % vol
C 4 =
7.6 % vol
C 5 + naphtha
59.0 % vol
Lt cycle oil
15.5 % vol
Slurry
14.0 % vol
Total
116.3 % vol on feed
In terms of BPCD:
Gas to C 3 = 714
C 3 to C 4 s = 1,736
Table 22 HVGO desulf material balance
Stream
BPCD (Scf/CD)
SG60
F (MW)
lbs/CD
Routing
In
Hydrogen MU
(2,232,000)
(11)
64,781
HVGO
9,275
0.9218
2,990,965
Total in
9,275 + MU
3,055,746
Out
H 2 S (+LE)
(933,439)
(34)
23,739
Gas treating
Naphtha
566
0.786
154,518
Nap hydrotreater
Gas oil
8,811
0.898
2,756,987
FCCU
H 2 S vent
(162,777)
(28)
120,502
Fuel gas via GT
Total out
9,377 (+ gases)
3,055,746
Table 23 Desulfurizer sulfur balance
Streams
MM lbs/CD
% wt sulfur
lbs sulfur/CD
Feed in
HVGO
2.991
3.1
92,720
Mu gas
0.065
Neg
Nil
Total in
3.056
92,720
Products out
H 2 S + light ends
0.024
41.0
a
9,840
Naphtha
0.155
0.08
125
Gas oil
2.756
0.5
13,908
Vent gas
0.121
57.0
a
68,847
Total out
3.056
92,720
a
Sulfur in the form of H 2 S from purge and stripper overheads
Petroleum Products and a Refinery Configuration
103