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Ethylene polymerization method and polyethylene

A technology of ethylene polymerization and polymerization reaction, applied in the field of polyethylene, which can solve the problems of poor thermal stability and hydrothermal stability, collapse of pore walls, low ethylene polymerization activity, etc., and achieve stable mesopore structure, not easily broken, and high catalytic activity Effect

Active Publication Date: 2017-12-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason for the low ethylene polymerization activity of the mesoporous material MCM-41 after loading the catalyst is that the thermal and hydrothermal stability of the pore wall structure of MCM-41 is poor, and the pore wall partially collapses during the loading process, which affects the loading. effect, so that it affects the catalytic activity

Method used

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  • Ethylene polymerization method and polyethylene
  • Ethylene polymerization method and polyethylene
  • Ethylene polymerization method and polyethylene

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preparation example Construction

[0024] In a preferred case, the preparation method of the catalyst may include: in the presence of an inert gas, impregnating the carrier in a mother liquor containing magnesium salt and / or titanium salt, and then successively filtering and drying; wherein, the carrier The spherical composite material provided by the present invention.

[0025] In the present invention, the impregnating conditions may include: a temperature of 25-100° C., and a time of 0.1-5 hours; preferably, the impregnating conditions include: a temperature of 40-60° C., and a time of 1-3 hours.

[0026] In the present invention, the amount of the magnesium salt and the titanium salt is not particularly limited, and preferably, the amount of the carrier, the magnesium salt, and the titanium salt is such that in the prepared supported polyethylene catalyst, the Based on the total weight of the catalyst, the content of the carrier is 90-99% by weight, and the sum of the contents of the magnesium salt and tita...

Embodiment 1

[0083] This embodiment is used to illustrate the ethylene polymerization method provided by the present invention.

[0084] (1) Preparation of spherical composite materials

[0085] Add 1g (0.00017mol) of template agent P123 and 1.69g (0.037mol) of ethanol into 28mL of acetic acid and sodium acetate buffer solution with pH = 4.4, stir at 15°C until the template agent is completely dissolved, and add 6g (0.05mol) of three Add methylpentane to the above solution, stir at 15°C for 8h, then add 2.13g (0.014mol) tetramethoxysilane to the above solution, stir at 15°C for 20h, then transfer the solution to the agate lining After crystallization in an oven at 60°C for 24 hours in a reaction kettle, filter and wash with deionized water for 4 times, and then suction filter to obtain a filter cake A1 of mesoporous molecular sieve material with a hollow spherical structure.

[0086] The water glass with a concentration of 15% by weight and the sulfuric acid solution and glycerin with a c...

Embodiment 2

[0109] This embodiment is used to illustrate the ethylene polymerization method provided by the present invention.

[0110] (1) Preparation of spherical composite materials

[0111] Add 1g (0.00017mol) template agent P123 and 1.4g (0.03mol) ethanol to 28mL of acetic acid and sodium acetate buffer solution with pH = 4.4, stir at 10°C until the template agent is completely dissolved, add 4.56g (0.04mol) Add trimethylpentane to the above solution, stir at 10°C for 8h, then add 1.83g (0.012mol) tetramethoxysilane to the above solution, stir at 10°C for 30h, then transfer the solution into agate In a lined reactor, after crystallization in an oven at 80°C for 20 hours, filter and wash with deionized water for 6 times, and then suction filter to obtain filter cake A2 of mesoporous molecular sieve material with a hollow spherical structure.

[0112] Water glass with a concentration of 20% by weight and a sulfuric acid solution with a concentration of 12% by weight and propylene glyc...

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Abstract

The invention relates to the field of polymerization reactions and discloses an ethylene polymerization method and polyethylene produced therefrom. The ethylene polymerization method includes the steps of: in the presence of a catalyst, polymerizing ethylene under polymerization reaction conditions, wherein a catalyst contains a spherical composite material and magnesium salt and / or titanium salt supported thereon. The spherical composite material contains a mesoporous molecular sieve material having a hollow spherical structure and silica gel. The invention also discloses polyethylene produced through the method. The supported polyethylene catalyst has high catalytic activity when being used in the ethylene polymerization reaction. Meanwhile, a polyethylene product having excellent performance is produced.

Description

technical field [0001] The invention relates to the field of polymerization reaction, in particular to a method for ethylene polymerization and polyethylene prepared by the method. Background technique [0002] Polyethylene is a polymer produced by polymerization of ethylene as a monomer. Due to its excellent low temperature resistance and good chemical stability, polyethylene is widely used in the chemical industry. In the process of preparing polyethylene, the use of polyethylene catalyst is one of the key factors affecting the yield and quality of polyethylene products. [0003] The development and application of polyethylene catalysts is another major breakthrough in the field of olefin polymerization catalysts after the traditional Ziegler-Natta catalysts, which makes the research on polyethylene catalysts enter a stage of rapid development. Because the homogeneous polyethylene catalyst requires a large amount of catalyst to achieve high activity, high production cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F4/645C08F4/02
CPCC08F110/02C08F4/645C08F4/02
Inventor 亢宇张明森周俊领吕新平徐世媛张志会
Owner CHINA PETROLEUM & CHEM CORP
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