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OTA！FCC gasoline aromatization to remove olefins
Concept
Reactions of
Olefins To Aromatics &
Alkylates(OTA) are processes of no-loss on gasoline yield, the hydrogen consumption is also low. OTA process can not only reduce olefin contents, but also recovery the octane loss of gasoline caused by olefins reduction.
OTA technology includes two parts, pre-hydrotreating(SHT) and olefins aromatization(OTA). In the SHT part, main reactions are diolefins selective hydro-saturation, HDS and HDN, through which a good environment is created for the following aromatization reactions. In the OTA part, main reactions are olefins aromatization, benzene/light olefins alkylation, n-alkanes isomerization and hydrocracking.
FCC gasoline aromatization to remove olefins technology employed SHT/FDO catalysts and optimized operating conditions, is called OTA technology in short. For the specialized purposes, OTA catalysts adopted optimized pore structure in favor of the n-alkanes selective cracking, adopted proper acidity to allow n-alkanes isomerization and avoid the gasoline yield loss caused by over-cracking, adopted matched active metals to allow the light hydrocarbons aromatization and benzene alkylation.
Features
✧ Can treat full range FCC gasoline feeds with high olefin contents
✧ Single stage process
✧ Special catalyst
✧ High olefins removal
✧ Low octane loss
✧ High liquid yield (>95%)Low hydrogen consumption(0.05~0.20%)
Aimed at
✧ Treating feeds of high sulfur content(500-800ppm) and high olefin contents(30-50%) while effluents sulfur requirements are lower than 200ppm and olefin requirements are lower than 20v%;
✧ Treating feeds of sulfur contents <500ppm and olefin contents between 30-50m% while effluents sulfur requirements are lower than 100ppm and olefin requirements are lower than 20v%.
Typical results
OTA technology can reduce olefins of FCC gasoline from 40v% to 50v%, reduce sulfur from 700mg/g to below 200mg/g or from 300mg/g to below 50mg/g, benzene content can be reduced from 1.7m% to 1.0m%, meanwhile, RONA loss is no more than 1.0 unit, yield of C5 is higher than 98m%, chemical hydrogen consumption is lower than 0.11m%.
The OTA technology has been commerciallized in Jingling Petrochemical Company.
Operating
conditions of OTA technology
|
Items |
SHT |
OTA |
|
Pressure/MPa |
2.0゛4.0 |
2.0゛4.0 |
|
Temperature/≧ |
180~280 |
360~440 |
|
LHSV/h-1 |
2.0゛6.0 |
1.0~3.0 |
|
H2/oil(v/v) |
500:1 |
500:1 |
Typical results of OTA technology
|
Items |
S/m
g〜 g-1 |
Olefins/v% |
RON |
|
A
FCC gasoline
Product
1
Product
2 |
200
<50
<100 |
56.3
25.5
37.8 |
90.8
90.5
90.6 |
|
B
FCC gasoline
Product1
Product2 |
700
<200
<300 |
41.3
16.1
25.8 |
93.0
91.4
91.8 |
|
C
FCC
gasoline
Product |
250
<50 |
46.8
18.7 |
89.2
88.8 |
Mass
balance of OTA technology
|
Items |
Case
1 |
Case
2 |
|
Pressure/MPa |
Base-1.0 |
Base |
|
In/m% |
|
Feed |
100.0 |
100.0 |
|
Hydrogen |
0.08 |
0.11 |
|
Sub-total |
100.08 |
100.11 |
|
Out/m% |
|
H2S+NH3 |
0.06 |
0.06 |
|
C1~C4 |
1.07 |
1.51 |
|
C5+ |
98.95 |
98.54 |
|
Sub-total |
100.08 |
100.11 |
PONA
of OTA product, m%
|
C
number |
P |
O |
N |
A |
Sub-total |
|
Feed |
Product |
Feed |
Product |
Feed |
Product |
Feed |
Product |
Feed |
Product |
|
4 |
0.3 |
2.6 |
1.8 |
2.7 |
0.0 |
0.0 |
0.0 |
0.0 |
2.1 |
5.2 |
|
5 |
6.8 |
9.3 |
13.3 |
5.2 |
0.0 |
0.0 |
0.0 |
0.0 |
20.2 |
14.4 |
|
6 |
7.9 |
10.7 |
10.2 |
3.1 |
1.3 |
1.9 |
1.7 |
1.0 |
21.1 |
16.8 |
|
7 |
5.3 |
6.9 |
8.3 |
3.6 |
1.9 |
3.3 |
2.2 |
3.2 |
17.7 |
17.0 |
|
8 |
5.4 |
6.7 |
3.5 |
1.7 |
2.9 |
3.2 |
5.3 |
8.1 |
17.1 |
19.5 |
|
9 |
4.3 |
5.5 |
1.6 |
0.4 |
2.0 |
2.0 |
5.4 |
7.7 |
13.3 |
15.6 |
|
10 |
2.1 |
2.3 |
0.3 |
0.1 |
0.7 |
0.4 |
2.3 |
2.9 |
5.4 |
5.6 |
|
11 |
1.6 |
1.8 |
0.0 |
0.0 |
0.0 |
0.0 |
0.3 |
0.6 |
1.9 |
2.4 |
|
12 |
0.2 |
0.1 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.1 |
0.2 |
0.2 |
|
Total |
34.3 |
47.3 |
39.4 |
17.2 |
8.9 |
11.2 |
17.4 |
24.2 |
100 |
100 |
Gasoline
qualities of OTA technology
|
Items |
Feed
1 |
Product
1 |
Feed
2 |
Product
2 |
|
Density/g〜
cm-3 |
0.7240 |
0.7340 |
0.7110 |
0.7240 |
|
S/m
g〜 g-1 |
730 |
178 |
1600 |
570 |
|
Mercaptan/m
g〜 g-1 |
16.5 |
3.3 |
18.5 |
5.1 |
|
Doctor
test |
Failure |
Pass |
Failure |
Pass |
|
Copper
strip corrosion(50≧,3hrs) |
- |
1
grade |
- |
1
grade |
|
Gum/mg/100ml |
4.0 |
2.0 |
5.0 |
2.0 |
|
Olefins/v% |
41.3 |
16.6 |
54.2 |
28.0 |
|
Aromatics/v% |
23.6 |
34.1 |
14.1 |
24.8 |
|
RON |
93.0 |
91.3 |
91.7 |
90.9 |
|
MON |
80.6 |
80.5 |
78.9 |
79.8 |
|
Boiling
range/≧ |
|
|
|
|
|
IBP |
37.7 |
30.6 |
27.3 |
29.6 |
|
5% |
48.7 |
47.2 |
39.5 |
45.9 |
|
50% |
94.7 |
108.3 |
83.4 |
103.3 |
|
90% |
165.3 |
175.1 |
145.5 |
167.9 |
|
EP |
185.1 |
196.2 |
168.0 |
195.2 |
|
