Hydrocarbon Processing - March 2022 - 38

Petrochemical Technology
increased from 70.6% to 78.8%, the coke yield increased slightly.
Compared with advanced catalytic cracking technology
(MIP), the gasoline composition of the ULO technology is
quite different (FIG. 8). MIP gasoline has high isoparaffin content
and moderate olefin and aromatic content, the result of
both the cracking reaction and hydrogen transfer reaction. ULO
gasoline has much higher isoparaffin content, with an olefin
content less than 10%, and slightly higher aromatics content, the
result of strengthening the selective hydrogen transfer reaction.
TABLE 2. DTFBs use diff erent heavy oil to produce propylene
and marine fuel oil
Feedstock
Density (20°C)/(kg·m-3
Hydrogen content, %
Product distribution, %
Dry gas
LPG
Gasoline
Light diesel
Marine fuel oil
Coke
Total
Propylene, %
Total butene, %
)
Reaction temperature, °C
HVGO
892
12.85
530
2.25
27.47
32.49
7.03
28.77
1.99
100
11.61
11.21
VRDS
921
12.19
530
4.09
26.37
26.17
5.89
31.13
6.36
100
10.67
10.82
AR
925
12.3
530
4.36
23.18
25.61
4.45
36.44
5.96
100
10.03
9.54
TABLE 3. Overview of three sets of DTFBs for processing
hydrogenated heavy oil
Company
Capacity, Mtpy
Feedstock
Density (20°C)/(kg·m-3
CCR, %
w(S), %
w(Ni)/(μg·g-1
w(V)/(μg·g-1
)
)
Product distribution, %
Dry gas
LPG
Gasoline
Diesel
Slurry
Coke
Gasoline properties
v(olefi ns), %
v(aromatics), %
RON
MON
w(S)/(μg·g-1
STC, %
)
)
HN
280
929
5.33
0.4
7
4.5
3.39
21.65
39.97
20.69
5.22
8.89
22.92
27.1
94
82.5
145
3.63
38 MARCH 2022 | HydrocarbonProcessing.com
JL
350
916
4
0.39
10.9
5.3
2.85
19.07
43.02
21.55
5.3
8.06
23.86
26.73
94.1
82.3
220
5.64
SH
350
926
5.2
0.4
4.2
6.5
3.11
13.42
46.89
21.54
6.7
7.84
23.2
29.3
91.8
80.3
84.3
2.11
Producing more propylene and marine fuel oil components.
With the progress of the times, the products produced
by DTFB can be transformed from conventional gasoline and
diesel to light olefins and marine fuel oil, which means a DTFB
continues to play an important role in the petrochemical industry.
By using three different types of heavy oil, a DTFB produces
more propylene and marine fuel oil components. The test results
are listed in TABLE 2.
From TABLE 2, with hydrogenated vacuum gasoil (HVGO),
vacuum residuum desulfurization (VRDS) or atmospheric resid
(AR), a DTFB can directly produce propylene with a yield
of > 10% and a marine fuel oil component yield of > 28%. If
the operation mode of light gasoline or light diesel recycling is
adopted, the propylene yield will be higher. Therefore, a DTFB
has achieved another transformation and upgrading.
Advances in processing hydrogenated heavy oil. In recent
years, the trend of heavy and inferior crude oil has become
prominent, and the price gap between high-sulfur crude oil and
low-sulfur crude oil has widened. To improve the utilization efficiency
of petroleum resources and increase economic benefits,
refiners are favoring the combined processing route of the residual
oil hydrogenation unit and the catalytic cracking unit. Compared
with straight-run residue oil, the product distribution of
catalytic cracking of hydrogenated heavy oil has been significantly
improved, and product properties-especially the olefin
and sulfur content of gasoline-have been greatly improved.
TABLE 3 lists the overview of three sets of DTFBs for processing
hydrogenated heavy oil, including the main properties of raw
materials, product distribution and gasoline properties during
20
15
10
5
C5
C6
C7
C8
MIP
ULO
20
15
10
5
C9
Olefins composition
C10
C11
C5
C6
C7
C8
MIP
ULO
C9
i-P composition
FIG. 8. Comparison of gasoline olefin (left) and isoparaffin distribution
(right) of ULO and MIP.
35
30
25
20
15
10
5
4/5/2019
before revamp
5/15/2019
after revamp
6/24/2019
Date
8/3/2019
9/12/2019
FIG. 9. Changes in gasoline properties before revamp and after
revamp to the DTFB.
91.5
91
90.5
90
89.5
89
88.5
C10
C11
Olefins in gasoline, %
Olefins in gasoline, %
i-P in gasoline, %
RON
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