Hydrocarbon Processing - December 2022 - 34
Catalysts
TABLE 5. Product distribution and properties in blank
calibration and summary calibration
Blank calibration Summary calibration
Product distribution, %
Dry gas
LPG
Gasoline
Diesel
Recycle oil
Slurry
Coke
Liquid yield, %
Conversion, %
Selectivity of gasoline
Selectivity of coke
Properties of gasoline
Aromatics
Alkene
Alkane
Benzene
RON
MON
Properties of slurry
Density, kg × m3
Hydrocarbon fraction
Alkane, %
Aromatics, %
Gum, %
Asphalt, %
2.73
15.89
44.87
20.21
5.42
3.7
7.48
80.97
70.67
0.635
0.106
25
20.3
54.7
0.5
90.4
80.4
1034.3
23.1
48.9
26.4
1.6
2.24
15.97
45.9
20.97
4.29
3.79
7.18
82.84
70.95
0.647
0.101
23.2
24.8
52
0.4
90.8
80.5
1074.8
15.3
60.8
21.3
2.6
tribution of products, which can be found clearly in terms of the
variation of the yields of gasoline and coke.
It should be noted that the product distribution could vary
depending on the extent of reactions. Therefore, a more rational
reflection of the product distribution should be selectivity.
As shown in TABLE 5, compared to the previous catalystb
new catalysta
, the
shows a better performance in product distribution
with a 0.012% increase in the selectivity of gasoline and a
0.005% decrease of coke. The main properties of stabilized gasolines
during the calibration are also shown in TABLE 5. The volume
fraction of aromatic compounds is decreased from 25.0%
to 23.2%, while the volume fraction of alkenes is increased by
4.5%. The amount of benzene is barely changed. The RON of
stabilized gasolines is also increased by 0.4%.
All other properties meet the basic criteria, as well. The
properties of slurry are also provided in TABLE 5. The density
of slurry in the summary calibration is higher. The weight fraction
of alkanes is decreased to 7.8% while that of aromatic hydrocarbons
is enhanced to 11.9%; the ratio of both gum and
asphalt rises, as well. The aforementioned results indicate an
increase in the reaction depth, which confirms the ability of the
new catalyst to improve catalytic activity.
34 DECEMBER 2022 | HydrocarbonProcessing.com
NOTES
a SINOPEC'S ROC-1
b SINOPEC'S RICC-1
YUCHEN SHA is an Assistant Scientist at the Research Institute of Petroleum
Processing (RIPP), SINOPEC, where his main focus is on the development of
advanced catalysts for FCC and DCC processes. Prior to joining RIPP, Dr. Sha
received his PhD in chemistry from Wuhan University, where he worked on
the synthesis of nanoparticles and their application in organic synthesis.
LEI HAN is an Associate Scientist at the Research Institute of Petroleum
Processing (RIPP), SINOPEC, where she is engaged in the research of FCC and
DCC catalysts. Dr. Han has applied for 26 Chinese patents and 1 U.S. patent, and
has co-authored seven publications in domestic and international field journals.
PENG WANG is a Scientist at the Research Institute of Petroleum Processing
(RIPP), SINOPEC. She is the senior expert on R&D of catalytic cracking
catalysts and molecular sieves. Dr. Wang has 23 yr experience in this field
and has developed more than 10 commercialized catalysts and more than
100 authorized patents.
FIG. 5. Monthly statistical data of residue ratio (red), gasoline yield
(green) and coke yield (black).
Distribution of FCC products and their properties. To
illustrate the potential of the new catalyst, monthly statistical
data from 2019 to 2021 has been provided here, including the
residue ratio in raw materials and the yields of gasoline and
coke. As shown in FIG. 5, although the residue ratio fluctuates
between 40% and 90%, the yields of gasoline and coke remain
quite stable. The average yield of gasoline is ~45.5% and the
yield of coke is only ~5.8%. With the high residue ratio in the
raw materials, the cost of raw materials for the FCC process
would be reduced by almost $1,400/yr.
Takeaways. Because FCC raw materials are trending heavier,
the need for a more efficient catalyst for the catalytic cracking of
polycyclic naphthenes is increasing rapidly. With an improved
design of the zeolite material and matrix, the new catalysta
shows promise for industrial applications. The yield of gasoline
could reach 55.3% while the yield of coke is only ~5.8%, assuming
an average residue ratio of 61.1% in the raw materials.
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