Method and device for preventing olefine polymerization reactor of gas phase fluidized bed from caking

Abstract

The invention provides a method and a device for preventing an olefine polymerization reactor of a gas phase fluidized bed from caking, and relates to an olefine polymerization reaction process of a gas phase fluidized bed. The olefine polymerization reaction is carried out in a reaction system comprising a gas phase fluidized bed polymerization reactor, a recycle gas compressor and a recycle gascooler. The reaction system also comprises a standby driving system, and the driving system comprises a storage battery and an emergency motor. When a main motor of the compressor cannot work due to emergency power failure in a polymerization reaction process, the feed of a monomer and a catalyst is automatically cut off; and simultaneously under the condition of injecting a terminating agent into the reactor to terminate the reaction, the storage battery in the standby driving system supplies power to the emergency motor, and the emergency motor drives the recycle gas compressor in the polymerization reaction system to continuously work to enough time under the condition of ensuring a reactor bed in a fluidized state, so the terminating agent is fully contacted with the reactor bed to effectively terminate the polymerization reaction so as to prevent the reactor from caking.

Description

Technical field: [0001] The present invention relates to a gas-phase fluidized bed olefin polymerization reaction process, and more specifically, relates to a method and equipment for preventing polymer agglomeration in a reactor when the polymerization reaction is terminated under emergency power failure conditions. Background technique: [0002] The gas-phase fluidized bed olefin polymerization process is to polymerize monomers (one or more than one olefin) under the action of a catalyst with a transition metal as the active center (also known as a Ziegler-Natta catalyst) at a lower pressure A method of forming polymers. For example, US Pat. No. 4,302,566 discloses a typical fluidized bed reactor, which has been widely used in the industrial production of olefin polymers (such as polyethylene). Specifically in the gas-phase fluidized bed olefin polymerization process, the polymerization system includes a polymerization reactor, a recycle gas compressor and a recycle gas c...

AI Technical Summary

Problems solved by technology

However, the technology provided by this patent needs to be completed by multiple devices (compressors, turbines, valves, etc.) within the required time or conditions, that is, the circulating gas compressor has not been reduced to the required speed after the power failure. Therefore, there may still be certain risks, and once the required action cannot be completed, the purpose of terminating the reaction and preventing the reactor from agglomerating cannot be achieved by restarting the equipment

[0006] Minimizing the discharge of reactants is a direction for technological improvement, but the existing technology cannot completely avoid the discharge of reactants, and still needs to discharge a certain amount of reactants to the outside of the reaction system to achieve the purpose of effectively terminating the reaction and preventing reactor agglomeration

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