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Method for controlling particles distribution by adopting electric field and gas phase polymerization fluidized bed reactor

A fluidized bed reactor and gas phase polymerization technology, which is applied in the field of particle distribution control, can solve the problem of only placing electrodes and achieve the effect of improving fluidization quality

Inactive Publication Date: 2012-10-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need to generate corona discharge, its electrodes can only be placed in the dilute phase area of ​​the fluidized bed

Method used

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  • Method for controlling particles distribution by adopting electric field and gas phase polymerization fluidized bed reactor
  • Method for controlling particles distribution by adopting electric field and gas phase polymerization fluidized bed reactor
  • Method for controlling particles distribution by adopting electric field and gas phase polymerization fluidized bed reactor

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Embodiment 1

[0037] Such as figure 1 As shown, a gas-phase polymerization fluidized-bed reactor for realizing the method of controlling the particle distribution in the gas-phase polymerization reaction system by using an electric field, including a base (not shown), and a catalyst feed port 6 and a discharge port in the middle 8, the straight cylinder reaction section 2 and the expansion section 1, one end of the straight cylinder reaction section 2 is connected to the base, the other end is connected to the expansion section 1, and the side of the straight cylinder reaction section 2 close to the base is sequentially provided with a gas predistributor 5, a gas mixing Chamber 4 and gas distribution plate 3, there are four electrodes 7 perpendicular to the axis of straight reaction section 2 in straight reaction section 2. The four electrodes are from top to bottom (that is, along the straight reaction section 2 near the end of expansion section 1 to the straight reaction section 2). The d...

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Abstract

The invention discloses a method for controlling particles distribution in a gas phase polymerization reaction system by adopting electric fields. The particles distribution is controlled by the application of the electric field including a first electric field and a second electric field whose directions are in parallel with the direction of gas flow, the first electric field and the second electric field being in opposite direction, so as to control the movement of particles, especially small particles, thereby realizing selective discharging and at the same time, decreasing entrainment of the small particles and reducing sizes of air bubbles. The invention also discloses a gas phase polymerization fluidized bed reactor to realize the method. The gas phase polymerization fluidized bed reactor comprises a base, a straight tube reaction section and a expansion section of a catalyst inlet arranged in the middle part of the reactor, one end of the straight tube reaction section being connected with the base, the other end of the straight tube reaction section being connected with the expansion section, the straight tube reaction section having a gas pre-distributor, a gas mixing chamber and a gas distribution plate arranged near a position where the base is arranged, a plurality of electrodes being arranged in the straight tube reaction section. The reactor capable of being realized easily, can break the air bubbles and improve fluidization quality.

Description

technical field [0001] The invention relates to the field of methods and equipment for controlling particle distribution, in particular to a method for controlling particle distribution in a gas-phase polymerization reaction system by using an electric field and a gas-phase polymerization fluidized bed reactor for realizing the method. Background technique [0002] The gas-phase polymerization process can refine and recycle the solvent, which not only greatly reduces the investment and operation costs of equipment, but also is environmentally friendly. However, the gas-phase polymerization process, such as the gas-phase polyethylene polymerization process, has the biggest defect that it is difficult to meet the strong exothermic requirements of the gas-phase polymerization fluidized bed reactor. Generally speaking, in the gas phase polymerization reaction, the main heat transfer method of the gas phase polymerization fluidized bed reactor is through the temperature rise of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/02C08F2/34
Inventor 王靖岱朱子川黄正梁蒋斌波阳永荣王宇良董克增
Owner ZHEJIANG UNIV
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