Viscosity at 122
F = 75 cSt
SG at 60
F = 1.046
Pour point = 55
F
The product does not meet specification with respect to sulfur or specific gravity.
The product will be blended with hydrotreated gas oil for sulfur.
Total sulfur in thermal cracker residue 6,320 Â 42 Â 8:8 Â 0:0619
¼ 144,541 lbs:
Let x be lbs of hydrotreated LVGO in blend.
Then 144,541 þ 0:0035x ¼ 0:05 2,335,072 þ x
ð
Þ
x ¼ 597,578 lbs=CD of desulfurized LVGO:
Total fuel oil blend ¼ 2,335,072 þ 597,578 ¼ 2,932,650 lbs=CD
¼ 6,317 þ 1,990 BPCD ¼ 8,306 BPCD
SG at 60
F of fuel oil product = 0.998 which is within spec.
Pour point of thermal cracker residue is 55
F and, blended with LVGO, will
have a pour point <55
F, which meets fuel oil spec of 65
F max.
Blending for high-sulfur bunker fuel.
Uncommitted Thermal Cracked Residue amounts to 1,314 BPCD. This meets all
the criteria for high-sulfur bunker fuel without further blending. Decanted FCCU
Slurry will also be routed to this product. Then the total product = 923,000 lbs/CD
or 2,548 BPCD.
• The gas oil pool
Automotive diesel specification:
SG at 60
F, 0.83–0.86
Visc at 100
F, 1.6–5.5 cSt
Flash PM 150
F min
Pour point 15
F max
Sulfur 0.35 % wt max
Table 42 Fuel oil pour point blending
Components
Composition
ASTM 50 %
Pour point
Blend
BPCD
Fraction
50 %
Factor
Pour point
F
Index
A
B
AÂ B
C
A Â C
LVGO
2,648
0.91
700
637
15
5
4.6
Tc res
270
0.09
920
82.8
65
22
a
2
Total
2,918
1.00
719.8
6.6
a
The pour point corresponding to a 50 % ASTM point of 720
F and an index of 6.6 is 22
F.
Therefore, blend meets spec for marine diesel
Petroleum Products and a Refinery Configuration
117