Naphtha = 5,198
Lt cycle = 1,366
Slurry = 1,234
Total = 10,248
The overall FCC unit balance is given in Table 25.
Lt gas oil hydrotreater. The LGO hydrotreater will operate on two blocked
operations to desulfurize diesel feed and secondly to desulfurize kerosene.
i. Diesel operation. The feed in this case will consist of straight run diesel from
the CDU and the diesel cut from the thermal cracker. Thus:
The licensor guarantees 75 % wt sulfur removal. Therefore:
Sulfur removed ¼ 21,536 lbs=CD
Sulfur in product ¼ 7,179 lbs=CD
H 2 consumption for sulfur removal ¼ 157,664 Scf=CD for SR diesel
¼ 97,415 Scf=CD for cracked feed
¼ 673 moles=CD
H 2 cons: for ring saturation ¼ 384,474 Scf=CD for SR includes losses
ð
Þ
¼ 735,322 Scf=CD for cracked feed
¼ 2,954 moles=CD
Table 24 LVGO hydrotreater material and sulfur balance
Stream
BPCD
(Scf/D)
lbs/Gal
(MW)
MM
lbs/CD
Sulfur %
wt
Sulfur
lbs/CD
Routing
Feed in
LVGO
5,425
7.32
1.665
2.18
36,305
MU gas
(925,666)
(11)
0.027
Neg
Nil
Total in
5,425 (+
MU)
1.692
36,305
Out
Gas to C 5
(102,375)
(48)
0.013
84.4
a
10,783
Gas
treating
Naphtha
239
0.063
0.08
51
Nap HDS
Gas oil
5,295
1.592
0.34
5,446
Gas oil
pool
Vent gas
(394,435)
(23)
0.024
84.1
a
20,025
Gas
treating
Total out
5,534 (+
gases)
1.692
36,305
a
Sulfur in the form of H 2 S from purge and stripper overheads
104
D.S.J. Jones and S.A. Treese