Spouted fluidized bed-fluidized bed composite reactor and polymer preparation method

A spouted fluidized bed and fluidized bed technology, applied in chemical instruments and methods, chemical/physical processes, etc., can solve problems such as aggravated agglomeration, enhanced interparticle viscous force, reactor shutdown, etc., to achieve enhanced crushing effect , Enhance the effect of exercise activity

Inactive Publication Date: 2015-05-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the fluidized bed multi-temperature zone reactor process, the liquid content in the lower temperature area is larger than that in the condensed state process. Under this condition, liquid bridges will be formed between particles, and the viscous force between particles will be reduced. If these agglomerates are not broken in time, the fluidization quality of the bed will be further damaged, such as defluidization, bed collapse or even reactor shutdown.

Method used

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  • Spouted fluidized bed-fluidized bed composite reactor and polymer preparation method
  • Spouted fluidized bed-fluidized bed composite reactor and polymer preparation method

Examples

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Effect test

Embodiment 1

[0039] use as figure 1 The shown spouted fluidized bed-fluidized bed composite reactor is used to prepare olefin polymers, and the recycle gas flows out from the gas outlet 8 at the top of the reactor, and the entrained fine powder particles are separated by a cyclone separator 10, and the olefin polymer is made by a compressor 11. The circulating gas has a sufficient pressure head, and then the circulating gas is cooled by the heat exchanger 12, and the gas-liquid mixed stream at the outlet of the cooler is divided into two parts, the liquid phase stream and the gas phase stream, through the gas-liquid separator 13, and the liquid phase stream The strand enters the reactor bed through the pipe 14 and the liquid injector 15 arranged at the lower position of the spouted fluidized bed, where a G-L-S three-phase fluidized region is formed. The gas phase stream is divided into a jet gas stream and an auxiliary gas stream by a flow divider 16. The jet gas stream enters the inje...

Embodiment 2

[0042] The same spouted fluidized bed polymerization reactor as in Example 1 was used to prepare polyolefin. The superficial fluidization velocity and other conditions of the injection zone and the annulus zone are kept consistent with that of Example 1. It is mainly to change the following conditions to realize the regulation and control of the molecular weight distribution of the product. By adjusting the temperature at the outlet of the heat exchanger, the mass fraction of the liquid phase in the gas-liquid mixture was controlled at 40%. Combined with controlling the amount of catalyst added, the average temperature of the bottom G-L-S three-phase region was maintained at 70°C, while the average temperature of the upper G-S three-phase region was maintained at 86°C. The pressure in the reaction zone was adjusted to 2.1 MPa.

[0043] After the above reaction process was carried out for 6 hours, the polyethylene particles were taken out through the pipeline 2, and the obtai...

Embodiment 3

[0045] The same spouted fluidized bed polymerization reactor as in Example 1 was used to prepare polyolefin. The superficial fluidization velocity and other conditions of the injection zone and the annulus zone are kept consistent with that of Example 1. By adjusting the temperature at the outlet of the heat exchanger, the mass fraction of the liquid phase in the gas-liquid mixture was controlled at 60%. Combined with controlling the amount of catalyst added, the average temperature of the bottom G-L-S three-phase region is maintained at 65°C, while the average temperature of the upper G-S three-phase region is maintained at 90°C. The pressure in the reaction zone was adjusted to 2.1 MPa.

[0046] After the above reaction process was carried out for 6 hours, the polyethylene particles were taken out through the pipeline 2, and the obtained polyethylene particles were analyzed through a gel permeation chromatography column, and the results are shown in Table 1.

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Abstract

The invention discloses a spouted fluidized bed-fluidized bed composite reactor and a polymer preparation method. The reactor includes an expansion section, a straight pipe section cylinder, and a hole shrinkage section. A gas distribution plate is disposed at the middle part of the straight pipe section cylinder, the part above the gas distribution plate is a fluidized bed, and the part below the gas distribution plate is a spouted fluidized bed. A cone-shaped baffle is arranged below the gas distribution plate, which is provided with solid discharge pipes. The bottom of each discharge pipe is equipped with a gas distribution piece connected to a gas source. The hole shrinkage section is provided with a discharge pipeline and an auxiliary fluidized gas inlet, and the bottom of the hole shrinkage section is equipped with a spouted fluidized gas inlet. The discharge pipeline is provided with a first valve and a second valve. A gas outlet, a first pipeline, a cyclone separator, a compressor, a heat exchanger, a gas-liquid separator, a shunt, a fourth pipeline, and the spouted fluidized gas inlet are connected. The gas-liquid separator, a second pipeline, a liquid ejector, and the spouted fluidized bed are connected in order. The spouted fluidized bed and the fluidized bed produce high and low molecular weight polymers, and further, products with broad molecular weight distribution can be obtained. And the products have excellent structure and performance.

Description

technical field [0001] The invention relates to a spouted fluidized bed-fluidized bed composite reactor and a polymer preparation method thereof, mainly used for olefin polymerization, but not limited to olefin polymerization, and can be used in other similar industrial application fields. Background technique [0002] In modern life, polyolefin resins are inseparable from human food, clothing, housing and transportation. From simple packaging bags to complex automobile and aircraft components, polyolefin resins are playing an irreplaceable role, especially polyethylene and polypropylene resins. Its output and its product application consumption are among the best. The industrial production methods of polyolefin mainly include slurry polymerization, solution polymerization and gas phase polymerization. At present, the gas phase process is produced in the form of fluidized bed, horizontal stirred tank, vertical stirred bed and other reactors. It has the advantages of simple ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/26C08F2/01C08F10/00
Inventor 王靖岱周业丰黄正梁顾玉彬阳永荣廖祖维蒋斌波訾灿杨勇柳莺
Owner ZHEJIANG UNIV
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