Core technologies
Manufacturing of key equipment for propylene oxide/styrene co-production technology
Overview
Propylene oxide is the third largest propylene derivative after polypropylene and acrylonitrile. It is mainly used in the production of polyether and propylene glycol. Its derivatives are widely used in industries such as automobiles, construction, food, tobacco, medicine and cosmetics. . Nearly 100 kinds of downstream products have been produced, which are important raw materials for fine chemical products.
In industry, propylene oxide production technology mainly includes chlorohydrin method and indirect oxidation method. The characteristics of the production of propylene oxide by the chlorohydrin method are that the process is relatively short, the process is mature, and the construction investment is small; but the production of propylene oxide by the chlorohydrin method will produce a large amount of waste water containing calcium chloride, and the environmental pollution is very serious. Since 2011, the approval of the new chlorohydrin process propylene oxide plant has been suspended.
At present, all domestic propylene oxide plants using indirect oxidation process adopt foreign technology. Changzhou Ruihua Chemical has incorporated indirect oxidation propylene oxide technology into the scope of research and development from the beginning of the company. After five years of development, it has successfully developed propylene oxide/styrene co-production (PO/SM) and propylene oxide/benzene. The complete process technology of ethylene co-production (PO/AMS) has made up for the blank of domestic indirect oxidation propylene oxide technology.
Key equipment
Some key equipment of the process is shown in the figure, and the details are shown in the table below:
NO |
Equipment name |
Equipment main material |
Container categories |
||
1 |
Alkylation reactor R-2101 |
Q345R,16MnⅢ |
III |
||
2 |
Anti-alkylation reactor R-2102 |
Q345R,16MnⅢ |
III |
||
3 |
Hydrogenation reactor R-2602 |
Q345R,16MnⅢ |
III |
||
4 |
Cyclization protection reactor R2402 |
S31603 |
III |
||
5 |
Epoxidation reactor R2401A/B/C |
Q345R 16MnⅢ |
Q345R+S31603 16MnⅢ(SurfacingS31603) |
III |
|
6 |
Protection reactor R2103 |
Q345R,16MnⅢ |
III |
||
7 |
Hydrogenation protection reactor R-2601A/B |
Q345R,16MnⅢ |
III |
||
8 |
Falling film crystallizer (CR-1501A/B) |
S30408 S30408 Ⅱ |
II |
||
9 |
Scraper evaporator E-2815 |
S30408 |
I |
||
10 |
Dehydration reactor R-2701A/B |
15CrMoR,15CrMoⅡ |
|||
11 |
Alkylation reactor R-2101 |
Q345R,16MnⅢ |
III |
||
12 |
Anti-alkylation reactor R-2102 |
Q345R,16MnⅢ |
III |
||
13 |
Hydrogenation reactor R-2602 |
Q345R,16MnⅢ |
III |
||
14 |
Phenyl alcohol vaporizer E-2701 |
Q345R,16MnII |
II |
||
15 |
Cyclization protection reactor R2402 |
S31603 |
III |
||
16 |
Epoxidation reactor R2401A/B/C |
Q345R 16MnⅢ |
Q345R+S31603 16MnⅢ(SurfacingS31603) |
III |
|
17 |
Protection reactor R2103 |
Q345R,16MnⅢ |
III |
||
18 |
Hydrogenation protection reactor R-2601A/B |
Q345R,16MnⅢ |
III |
||
19 |
Falling film crystallizer (CR-1501A/B) |
S30408 S30408 Ⅱ |
II |
||
20 |
Three-effect evaporator E-2327/E-2328/E-2329/V-2318 |
TA2 |
I |
||
21 |
Peroxide decomposer E-2326 |
TA2 |
S30408 forged S30408, TA2 |
II |
|
22 |
Epoxidation caustic washing tank V-2406 |
Q345R 16MnⅡ |
II |
||
23 |
Scraper evaporator E-2815 |
S30408 |
I |
||
24 |
Dehydration reactor R-2701A/B |
15CrMoR,15CrMoⅡ |
|||
25 |
Circulating ethylbenzene preheater E-2320 |
Q345R,20,20Ⅱ |
Q345R,20,16MnⅡ |
Application examples
The raw material ethylbenzene used in the POSM process must be produced by the alkylation of vinylbenzene, and the purity of ethylbenzene>=99.8%; the raw material propylene must meet the requirements of high-quality products in GB 7716-2002. Major customers in recent years:
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