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Method for using rotating-stream tray in phase-phase polyethylene process and rotating-stream tray device

A swirl plate, polyethylene technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems affecting the fluidization gas velocity and fluidization quality of the bed, and improve the space-time yield and the quality of the fluidization. Stability of plant operation, effect of reducing pressure drop and increasing flexibility of operation

Active Publication Date: 2012-07-04
CHINA PETROCHEMICAL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, because there is a certain pressure drop loss in the gas-liquid separator, if the pressure drop is too large, it will inevitably affect the fluidization gas velocity and fluidization quality of the bed.

Method used

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  • Method for using rotating-stream tray in phase-phase polyethylene process and rotating-stream tray device
  • Method for using rotating-stream tray in phase-phase polyethylene process and rotating-stream tray device
  • Method for using rotating-stream tray in phase-phase polyethylene process and rotating-stream tray device

Examples

Experimental program
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Effect test

Embodiment 1

[0044] exist figure 1 The linear low-density polyethylene (LLDPE) is produced in the fluidized bed polymerization reactor using the external swirl plate separator shown. Under the action of the Z-N catalyst system, the polymerization reaction temperature is 88 ° C, the pressure is 2.1 MPa, and the reactor is empty. Tower speed 0.67m / s. The diameter of the external swirl plate separator is 3.2m, the outer diameter of the blade is 2.2m, the diameter of the blind plate is 0.7m, the elevation angle of the blade is 25°, and the number of blades is 16. The circulating gas flow in pipeline 3 includes hydrogen, nitrogen, methane, ethane, ethylene, hexene and hexane, the pressure is 2.1 MPa, and the temperature is 86°C. Contain 25% condensed liquid in the recirculating gas flow from condenser 5, the liquid phase is hexene and hexane, and the density is 615.2kg / m 3 , the gas phase density is 28.0kg / m 3 . Through the external swirl plate separator, the condensate content in the pipe...

Embodiment 2

[0046] exist figure 1 The linear low-density polyethylene (LLDPE) is produced in the fluidized bed polymerization reactor using the external swirl plate separator shown. Under the action of the Z-N catalyst system, the polymerization reaction temperature is 87 ° C, the pressure is 2.1 MPa, and the reactor is empty. Tower speed 0.70m / s. The diameter of the external swirl plate separator is 2.5m, the outer diameter of the blade is 2.0m, the diameter of the blind plate is 0.6m, the elevation angle of the blade is 20°, and the number of blades is 20. The circulating gas flow in pipeline 3 includes hydrogen, nitrogen, methane, ethane, ethylene, and isopentane, with a pressure of 2.1 MPa and a temperature of 84°C. Contain 35% condensate in the circulating airflow from the condenser 5, the liquid phase is isopentane, and the density is 650.0kg / m 3 , the gas phase density is 33.0kg / m 3 . Through the external swirl plate separator, the content of condensate in the pipeline 7 can r...

Embodiment 3

[0048] exist figure 1 The linear low density polyethylene (LLDPE) is produced in the fluidized bed polymerization reactor using the external swirl plate separator shown. Under the action of the Z-N catalyst system, the polymerization reaction temperature is 85 ° C, the pressure is 2.3 MPa, and the reactor is empty. Tower speed 0.75m / s. The diameter of the external swirl plate separator is 2.5m, the outer diameter of the blade is 2.0m, the diameter of the blind plate is 0.6m, the elevation angle of the blade is 25°, and the number of blades is 18. Install a wire mesh demister on the top of the external swirl plate separator, with a wire diameter of 0.5mm and a void ratio of 98%. The circulating gas flow in pipeline 3 includes hydrogen, nitrogen, methane, ethane, ethylene, hexene and hexane, the pressure is 2.3MPa, and the temperature is 82°C. Contain 45% condensed liquid in the recirculating gas flow from condenser 5, the liquid phase is hexene and hexane, and the density is...

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Abstract

The invention discloses a method for using a rotating-stream tray in a phase-phase polyethylene process and a rotating-stream tray device. The method comprises the following steps of: arranging a rotating-stream tray separator on a circulating pipeline, leading circulating air current out of the top of a fluidized bed, compressing, condensing, and performing gas-liquid separation in the rotating-stream tray separator to form stream which is rich in liquid phases and stream which is rich in gas phases; and spraying the stream which is rich in liquid phases into the fluidized bed from the upper part of a distributing plate, and introducing the stream which is rich in gas phases into a reactor from the lower part of the distributing plate for fluidizing a material and participating in polymerization, wherein the content of a condensate in the stream which is rich in liquid phases is 60-100 percent by weight of the total content of a condensate in a circulating air current; and the pressure drop through the rotating-stream tray separator is 1,500-6,500 Pa. According to the method and the device, the quantity of the condensate entering a fluidized bed reactor from the upper part of the distributing plate can be increased greatly, the phenomenon of liquid accumulation is avoided, the pressure drop of a gas-liquid separating device is reduced, the adjusting and controlling accuracy and ranges of the condensate quantity are increased, and the energy consumption of a system is lowered; and moreover, the form of the rotating-stream tray separator is optional, and operation is flexible.

Description

technical field [0001] The invention relates to an operation method and device for introducing condensate into a fluidized bed, and more particularly, to a method for using a swirl plate in a gas-phase polyethylene process and a swirl plate device. Background technique [0002] Polyethylene is a series of thermoplastic general-purpose plastics produced by various processes and has various structures and characteristics. It is one of the main varieties of synthetic resins and is widely used in agriculture, chemical industry, light industry, textiles, machinery and national defense. and other fields. The industrial production methods of polyethylene mainly include slurry polymerization, solution polymerization and gas phase polymerization. Among them, the gas phase polyethylene process has the advantages of simple process, large production capacity, strong production flexibility, low material consumption and energy consumption, and good safety performance, so it has become th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F2/34C08F2/01B01D45/16
Inventor 阳永荣孙婧元楼佳明王靖岱骆广海吴文清蒋斌波黄正梁朱子川
Owner CHINA PETROCHEMICAL CORP
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