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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

AI Technical Summary

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), brings industrial production like this A lot of inconvenience and inconsistent costs are incurred, which is not conducive to continuous industrial production

Method used

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  • Method for continuously producing polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0058] The catalyst was prepared according to Japanese Patent Publication No. 62-54326. After drying, 245 liters of n-hexane, 247 millimoles of triethylaluminum and 6.24 grams of the catalyst obtained by the aforementioned method were added in sequence to an 800-liter autoclave equipped with a stirrer that was thoroughly purged with nitrogen and replaced with ethylene. Keep the temperature in the kettle at 80°C, continuously feed ethylene, 1-butene and hydrogen, keep the total pressure at 0.9 MPa (gauge pressure), control the molar ratio in the gas phase composition of hydrogen and ethylene to be 1.50, and polymerize for 4 hours The polymerization reaction of engineering a is carried out under the conditions. 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 in the gas phase composition of hydrogen and ethylene is...

Embodiment 4

[0065] In Example 2, the temperature in the reactor of engineering d polymerization was maintained at 50°C, and the total pressure was maintained at 0.2 MPa (gauge pressure). Ethylene and a small amount of 1-butene were continuously fed into the liquid phase, and the polymerization time was 0.5 hour, but add a small amount of isopropanol as molecular weight modifier, the concentration of isopropanol in the solvent is 8ppm (weight), in this step, can obtain ultrahigh molecular weight component and effectively avoid producing ultrahigh molecular weight component equally, its The molecular weight is between high molecular weight and ultra high molecular weight.

[0066] After the reaction is finished, the pressure is released, replaced and cooled, and the polymerization activity and molecular weight of the finally obtained ethylene copolymerized resin composition are analyzed. The resulting ethylene copolymerized resin composition powder is dried and granulated with a twin-screw ...

Embodiment 5

[0070] After drying, 800 liters of autoclave equipped with a stirrer for thorough nitrogen blowing and ethylene replacement, add 260 liters of normal hexane, 262 millimoles of triethylaluminum and 7.41 grams of the catalyst obtained by the aforementioned method, the temperature in the still Keep 80°C, except 1-butene, continuously feed ethylene and hydrogen, keep the total pressure at 0.87 MPa (gauge pressure), control the molar ratio of hydrogen and ethylene in the gas phase composition to 3.50, and polymerize for 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, keep the temperature at 75°C, keep the total pressure at 0.61 MPa (gauge pressure), polymerize for 2.2 hours, and control the flow of hydrogen and ethylene. The molar ratio in the gas phase composition was 0.16. Then enter the polymerization reaction of the third...

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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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