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Spouted fluidized bed reactor and polymer preparation method

A technology of spouted fluidized bed and reactor, applied in the direction of chemical instruments and methods, chemical/physical processes, etc., can solve problems such as aggravation of agglomeration, defluidization, enhancement, etc., to achieve enhanced movement activity and enhanced crushing Effect, strengthen the effect of impact

Inactive Publication Date: 2015-03-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the multi-temperature zone fluidized bed polymerization process, the liquid content in the lower temperature area is larger than that in the condensed state process, and liquid bridges are easily formed between particles, and the viscous force between particles will increase, thereby aggravating agglomeration However, if these agglomerates are not broken in time, the fluidization quality of the bed will be further damaged, resulting in defluidization, bed collapse and even shutdown of the reactor.

Method used

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  • Spouted fluidized bed reactor and polymer preparation method

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Effect test

Embodiment 1

[0038] The reaction cycle gas flows out from the gas outlet 6 at the top of the reactor, and the entrained fine powder particles are separated by the cyclone separator 8, and the cycle gas has a sufficient pressure head through the compressor 9, and then the cycle gas is cooled by the heat exchanger 10, and the cooling The gas-liquid mixed stream at the outlet of the device is divided into two parts, the liquid phase stream and the gas phase stream, through the gas-liquid separator 11, and the liquid phase stream passes through the pipeline 12 and the liquid injector 13 arranged at the lower position of the spouted fluidized bed Two reaction zones are formed in the reactor bed, the bottom is the G-L-S three-phase fluidized zone with liquid phase, and the upper part is the G-S two-phase fluidized zone with no liquid phase. The gaseous phase stream is divided into a jet gas stream 16 and an auxiliary gas stream 15 by a splitter 14, the stream 16 enters the injection zone thro...

Embodiment 2

[0041] The same spouted fluidized bed polymerization reactor as in Example 1 was used to prepare polyolefin. 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 60%. 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 88°C. The pressure in the reaction zone was adjusted to 2.1 MPa.

[0042] 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.

Embodiment 3

[0044] The same spouted fluidized bed polymerization reactor as in Example 1 was used to prepare polyolefin. By adjusting the temperature at the outlet of the heat exchanger, the mass fraction of the liquid phase in the gas-liquid mixture is controlled at 70%. Combined with controlling the amount of catalyst added, the average temperature of the bottom G-L-S three-phase region was maintained at 67°C, while the average temperature of the upper G-S three-phase region was maintained at 90°C. The pressure in the reaction zone was adjusted to 2.1 MPa.

[0045] 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 reactor and a polymer preparation method thereof. A closed shell is provided with an expansion section and a straight cylinder section that are mutually connected. The top of the expansion section is provided with a gas outlet, and the inside of the expansion section is provided with a cone-shaped baffle. The side wall of the straight cylinder section is equipped with a catalyst inlet, the lower part of the straight cylinder section is equipped with a diameter shrinkage section, which is provided with a discharge pipeline and an auxiliary gas inlet. The bottom of the diameter shrinkage section is equipped with a spouted fluidized gas inlet. The 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 in order. The bottom of the cyclone separator is in connection with the straight cylinder section. The gas-liquid separator, a second pipeline, a liquid ejector and the straight cylinder section are connected in order. The injection of fluid into the reactor makes the reactor falls into a first reaction area and a second reaction area. With the reactor provided in the invention, the sprouted gas and the auxiliary gas are distributed reasonably, regulation of the particle aggregation and agglomeration phenomena in the reactor can be realized, and polymer products with broad molecular weight distribution can be produced.

Description

technical field [0001] The invention relates to a spray fluidized bed reactor and a polymer preparation method thereof. Background technique [0002] The industrial production methods of polyolefin mainly include slurry polymerization, solution polymerization and gas phase polymerization. Among them, the gas phase process uses fluidized bed, horizontal stirred tank, vertical stirred bed and other reactor forms for production, which has the advantages of simple process, strong production flexibility, low energy consumption and high safety, so it has become a polyolefin production process in the mainstream. The fluidized bed reactor process is the most commonly used process in the gas phase process. With the continuous advancement of technology, the condensed state operation technology has appeared in the olefin polymerization fluidized bed reactor, which has attracted extensive attention from the industry. Condensed state operation introduces condensate into the fluidized ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/24
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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