Electrostatic control method for olefin polymerization process

Abstract

The invention discloses an olefin polymerization process electrostatic control method which comprises the following steps: mixing nascent state polyolefin powder and an antistatic compound at 30-60 DEG C, and standing for 24-72 hours to obtain nascent state polyolefin powder loaded with the antistatic compound; and when the electrostatic voltage in the olefin polymerization process rises to an electrostatic voltage threshold value, introducing the nascent state polyolefin powder loaded with the antistatic compound into a polymerization reactor filled with polyolefin powder through cascade control so as to control the electrostatic voltage in the olefin polymerization process. According to the method, the dispersion time of the antistatic agent in the gas-phase polymerization reactor can be shortened, and the loss is less, so that the antistatic agent has higher charge elimination effect and stability.

Description

technical field [0001] The invention belongs to the technical field of olefin polymerization, and in particular relates to a method for controlling static electricity in an olefin polymerization process. Background technique [0002] In the industrial production of polyolefins, the dry reaction environment in the gas phase polymerization reactor and the high insulation of polyolefins lead to frequent frictional electrification and slow static dissipation, providing natural conditions for the generation and accumulation of static electricity. The existence of static electricity in the production process may cause potential hazards such as wall sticking and agglomeration, and even cause reactor failure and explosion accidents. Therefore, antistatic agents are widely used in industrial fluidized bed reactors to control static electricity. [0003] The U.S. Patent No. US5034480A discloses a method for preparing ultra-high molecular weight ethylene polymers using an antistatic a...

AI Technical Summary

Problems solved by technology

[0005] In the continuous polymerization of olefins, using the above method to directly or indirectly add antistatic compounds to the polymerization reactor can effectively weaken the production of static electricity in the reaction process, but its disadvantage is that the addition of liquid phase antistatic compounds will affect the polymerization reactor. The internal fluid flows and is easily taken out or left on the wall of the reactor during the polymerization reaction, resulting in a certain loss of liquid-phase antistatic compounds

In addition, the high boiling point of the liquid antistatic agent usually prevents it from being vaporized in the polymerization reaction environment, and its poor fluidity also prevents it from being atomized. The antistatic agent that cannot be fully dispersed seriously restricts its antistatic effect.

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