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Manufacture of key equipment for propylene oxide/styrene co-production technology


Summary:

Propylene oxide is the third largest propylene derivative after polypropylene and acrylonitrile. It is mainly used in the production of polyether, propylene glycol, etc. Its derivatives are widely used in automobile, construction, food, tobacco, medicine and cosmetics industries. Nearly 100 kinds of downstream products have been produced, which are important raw materials for fine chemical products.


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Manufacture of key equipment for propylene oxide/styrene co-production technology
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Detailed description


Overview

Propylene oxide is the third largest propylene derivative after polypropylene and acrylonitrile. It is mainly used in the production of polyether, propylene glycol, etc. Its derivatives are widely used in automobile, construction, food, tobacco, medicine and cosmetics industries. Nearly 100 kinds of downstream products have been produced, which are important raw materials for fine chemical products.

Industrial propylene oxide production technology mainly has chlorohydrin method and indirect oxidation method. The production of propylene oxide by chlorohydrin method is characterized by relatively short process, mature process and low construction investment. However, a large amount of wastewater containing calcium chloride will be produced in the process of producing propylene oxide by chlorohydrin method, and the environmental pollution is very serious. Therefore, China has stopped the approval of new chlorohydrin propylene oxide plant since 2011.

At present, all domestic propylene oxide units using indirect oxidation process adopt foreign technology. Changzhou Ruihua Chemical has incorporated indirect oxidation propylene oxide technology into the scope of research and development since its establishment. After five years of development, it has successfully developed complete sets of process technologies for propylene oxide/styrene co-production (PO/SM) and propylene oxide/styrene co-production (PO/AMS).

 

Key Equipment

The key equipment of the process is shown in the figure, as shown in the table below:

a

Serial Number Equipment Name Main material of equipment Container Category
1 hydrocarbonylation reactor Q345R,16Mn Ⅲ III
2 reverse alkylation reactor Q345R,16Mn Ⅲ III
3 hydrogenation reactor Q345R,16Mn Ⅲ III
4 cyclization protection reactor S31603 III
5 epoxidation reactor Q345R 16Mn Ⅲ Q345R S31603 16Mn Ⅲ (Surfacing S31603) III
6 Protecting the reactor Q345R,16Mn Ⅲ III
7 hydrogenation protection reactor Q345R,16Mn Ⅲ III
8 falling film crystallizer S30408 S30408 II II
9 Scraper evaporator S30408 I
10 dehydration reactor 15CrMoR,15CrMo II    
11 hydrocarbonylation reactor Q345R,16Mn Ⅲ III
12 reverse alkylation reactor Q345R,16Mn Ⅲ III
13 hydrogenation reactor Q345R,16Mn Ⅲ III
14 Phenylethyl alcohol vaporizer Q345R,16MnII II
15 cyclization protection reactor S31603 III
16 epoxidation reactor Q345R 16Mn Ⅲ Q345R S31603 16Mn Ⅲ (Surfacing S31603) III
17 Protecting the reactor Q345R,16Mn Ⅲ III
18 hydrogenation protection reactor Q345R,16Mn Ⅲ III
19 falling film crystallizer S30408 S30408 II II
20 three-effect evaporator TA2 I
21 peroxide decomposer TA2 S30408 Forging S30408,TA2 II
22 Epoxidizing alkaline washing tank Q345R 16Mn Ⅱ II
23 Scraper evaporator S30408 I
24 dehydration reactor 15CrMoR,15CrMo II    
25 circulating ethylbenzene preheater Q345R,20,20 Ⅱ Q345R,20,16Mn II  

 

Application example

The raw material ethylbenzene for POSM process must be alkylated with vinylbenzene, and the purity of ethylbenzene is> = 99.8. Raw material propylene shall meet the requirements of GB 7716-2002 for superior products.

Major customers in recent years:

Serial Number Project Name Delivery time Remarks
1 Dongming CITIC Ruihua New Materials Co., Ltd. 200000 tons/year styrene co-production 80000 tons/year propylene oxide plant 2019.12  
2 Zhejiang Petrochemical Co., Ltd. 600000 tons/year styrene co-production 270000 tons/year propylene oxide plant In manufacturing  

 

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