Method and system for continuous gas-phase production of polyolefin elastomers

By improving the gas-phase polymerization process, including mixing, separation, heat exchange, and antistatic agent injection methods, the fluidization state problem of the gas-phase fluidized bed reactor was solved, enabling continuous production and stable operation of polyolefin elastomers, and improving production efficiency and safety.

CN119306872BActive Publication Date: 2026-05-26XINJIANG DUSHANZI PETROCHEMICAL CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XINJIANG DUSHANZI PETROCHEMICAL CO LTD
Filing Date
2024-12-16
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing gas-phase fluidized bed reactors exhibit poor fluidization during the production of polyolefin elastomers, leading to reactor malfunctions, material agglomeration, and crusting, which affect production continuity and safety.

Method used

The polymerization reaction was carried out by mixing ethylene, α-olefins, hydrogen, condenser and nitrogen with catalyst and antistatic agent. Unreacted materials were separated and subjected to primary heat exchange, pressurization and secondary heat exchange. The injection position and method of antistatic agent were changed. Metallocene catalyst was used and gas phase fluidization rate was controlled. The temperature, pressure and static electricity of the reactor were monitored.

Benefits of technology

It effectively prevents polymer powder from softening and clogging in heat exchangers and pipes, enabling continuous operation, improving production efficiency, reducing the content of fine polymer powder, and ensuring the stable operation and safety of the reactor.

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Abstract

This invention provides a method and system for the continuous gas-phase production of polyolefin elastomers. The method includes the following steps: mixing ethylene, α-olefin, hydrogen, nitrogen, a condenser, and nitrogen to obtain a mixed material; subjecting the mixed material, catalyst, and antistatic agent to a polymerization reaction to obtain polyolefin elastomer powder, polymerization reaction lumps, and unreacted material; sequentially separating, performing primary heat exchange, pressurizing, and secondary heat exchange on the unreacted material, and then adding it to the mixed material; wherein the polymerization reaction lumps are treated as waste, and the polyolefin elastomer powder is the product. The polyolefin elastomer preparation method of this invention can accelerate heat removal, thereby effectively preventing polymer softening, agglomeration, and blockage, and reducing the content of fine polymer powder. Furthermore, the system of this invention can solve the safety and stability problems existing in the gas-phase polymerization process.
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