Method for continuously producing polyethylene

A manufacturing method and polyethylene technology, applied in the field of continuous polyethylene manufacturing, can solve problems such as unfavorable industrial production and inconsistent cost, and achieve the effects of excellent rigidity and strength, excellent molding performance, and excellent ESCR

Inactive Publication Date: 2006-06-07
FORMOSA PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in order to contain more α-olefins in the component of step (c), the α-olefin addition in step (c) is higher than in step (a) and step (b), br

Method used

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  • Method for continuously producing polyethylene

Examples

Experimental program
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Example

[0057] Examples 1~3

[0058] The catalyst was prepared according to Japanese Patent Publication No. 62-54326. After drying, an 800 liter autoclave equipped with a stirrer was thoroughly blown with nitrogen and replaced with ethylene, and 245 liters of n-hexane, 247 millimoles of triethylaluminum, and 6.24 grams of the catalyst obtained by the foregoing method were sequentially added. The temperature in the kettle is maintained at 80℃, ethylene, 1-butene and hydrogen are continuously fed, and the total pressure is maintained at 0.9 MPa (gauge pressure). The molar ratio of the gas phase composition of hydrogen and ethylene is controlled to 1.50, and the polymerization time is 4 hours. Under the conditions of the polymerization reaction of engineering a. Then, enter the polymerization reaction of project b, the temperature is maintained at 75°C, the total pressure is maintained at 0.61 MPa (gauge pressure), the polymerization time is 2.5 hours, and the molar ratio of the gas phase ...

Example Embodiment

[0064] Example 4

[0065] In Example 2, the temperature in the reactor of the process d polymerization was maintained at 50°C, the total pressure was maintained at 0.2 MPa (gauge pressure), and ethylene and a small amount of 1-butene were continuously fed in a liquid phase, and the polymerization time was 0.5. However, adding a small amount of isopropanol as a molecular weight regulator, the concentration of isopropanol in the solvent is 8ppm (weight). In this step, it can also obtain ultra-high molecular weight components and effectively avoid the production of ultra-high molecular weight components. The molecular weight is between high molecular weight and ultra-high molecular weight.

[0066] After the reaction is completed, the pressure is released, replaced, and cooled, and the finally obtained ethylene copolymerized resin composition is analyzed for polymerization activity and molecular weight. The resulting ethylene copolymerized resin composition powder was dried and pel...

Example Embodiment

[0069] Example 5

[0070] After drying, an 800 liter autoclave equipped with a stirrer was thoroughly blown with nitrogen and replaced with ethylene. 260 liters of n-hexane, 262 millimoles of triethylaluminum and 7.41 g of the catalyst obtained by the above method were added in sequence. The temperature in the kettle Keep at 80℃. Except 1-butene, continuously feed ethylene and hydrogen. The total pressure is maintained at 0.87 MPa (gauge pressure). The molar ratio of the gas phase composition of hydrogen and ethylene is controlled to 3.50, and the polymerization time is 3.7 hours. The polymerization reaction of Engineering a is carried out under the conditions. Then, enter the polymerization reaction of project b, and then continuously feed 1-butene, ethylene and hydrogen, the temperature is maintained at 75 ℃, the total pressure is maintained at 0.61 MPa (gauge pressure), the polymerization time is 2.2 hours, and the hydrogen and ethylene are controlled. The molar ratio in the ...

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Abstract

The present invention relates to continuous polyethylene producing process to produce multiple section polymerized resin composition. The production process includes the stage A of preparing polyethylene of limit viscosity 0.1-4.0, the stage B of preparing polyethylene of limit viscosity 1.0-7.0, the stage C of preparing polyethylene of limit viscosity 1.0-7.0, and the stage D of preparing polyethylene of limit viscosity 2.0-11.5. The resin composition has limit viscosity range of 1.1-8.0, density range of 0.935-0.965 g/cu cm, excellent environment stress tolerance and excellent rigidity, and may be used in making product with excellent outer appearance and no fish eye and gel faults.

Description

technical field [0001] The invention belongs to the technical field of polyethylene production, and in particular relates to a multi-stage polymerization manufacturing process of a polyethylene resin composition. Because the resin has a wide or bimodal molecular weight distribution, it is conducive to the production of excellent environmental stress cracking resistance ( Hereinafter referred to as ESCR) and excellent rigidity hollow molding chemical drum (drum) and extruded tubing, not only the inner wall and appearance of the formed material are good, but also there is no fish eye or gel defect, more specifically, the present invention relates to the improved A manufacturing method that improves the moldability of the resin and reduces production costs due to an increase in catalyst activity. Background technique [0002] In recent years, with the continuous emergence of new technologies and new products, the demand for high-performance polyethylene in the consumer market i...

Claims

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Application Information

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IPC IPC(8): C08F10/02C08F2/00C08F4/645
Inventor 萧吉雄陈武隆吴政龙吴东昆涂振华陈芳余叶光超王瑞棠
Owner FORMOSA PLASTICS CORP
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