Ethylene polymerization method and polyethylene

An ethylene polymerization and polymerization reaction technology, applied in the field of polyethylene, can solve the problems of pore wall collapse, poor thermal stability and hydrothermal stability, low ethylene polymerization activity, etc., and achieves unbreakable, stable mesoporous structure, 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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Effect test

preparation example Construction

[0025] The preparation method of the spherical composite material is not particularly limited in the present invention, as long as it contains a mesoporous molecular sieve material with a three-dimensional cubic cage structure and silica gel and has the above-mentioned microscopic size. In order to further improve the performance of polyethylene products, Preferably, the preparation method of the spherical composite material comprises the following steps:

[0026] (1) providing a mesoporous molecular sieve material with a three-dimensional cubic cage structure or preparing a filter cake of a mesoporous molecular sieve material with a three-dimensional cubic cage structure as component a;

[0027] (2) providing silica gel or preparing a filter cake of silica gel as component b;

[0028] (3) The component a, the component b and the binder are mixed and ball milled, and the solid powder obtained after ball milling is made into a slurry with water, and then the obtained slurry is ...

Embodiment 1

[0080] This example is used to illustrate the ethylene polymerization method and the obtained polyethylene of the present invention.

[0081] (1) Preparation of spherical composite materials

[0082] 1.46g (0.0001mol) template agent F108, 5.24g (0.03mol) K 2 SO 4 Stir with 60g of hydrochloric acid solution with a normality of 2 at 38°C until F108 is completely dissolved;

[0083] Add 4.2g (0.02mol) tetraethyl orthosilicate to the above solution, stir at 38°C for 15 minutes, and stand at 38°C for 24 hours;

[0084] Then it was transferred to an agate-lined reaction kettle, crystallized at 100°C for 24 hours, then filtered and washed with deionized water for 4 times, and then suction filtered to obtain a filter material of mesoporous molecular sieve material with a three-dimensional cubic cage structure. Pie A1.

[0085] The water glass with a concentration of 15% by weight and the sulfuric acid solution and glycerin with a concentration of 12% by weight are mixed in a weigh...

Embodiment 2

[0111] This example is used to illustrate the ethylene polymerization method and the obtained polyethylene of the present invention.

[0112](1) Preparation of spherical composite materials

[0113] 1.46g (0.0001mol) template agent F108, 6.96g (0.04mol) K 2 SO 4 Stir with 60g of hydrochloric acid solution with a normality of 2 at 38°C until F108 is completely dissolved;

[0114] Add 3.1g (0.015mol) ethyl orthosilicate to the above solution, stir at 45°C for 15min, and stand at 45°C for 30h;

[0115] It was then transferred to an agate-lined reactor, crystallized at 120°C for 30 h, then filtered and washed 4 times with deionized water, and then suction filtered to obtain a filter cake of mesoporous molecular sieve materials with a three-dimensional cubic cage structure A2.

[0116] Water glass with a concentration of 20% by weight and a sulfuric acid solution with a concentration of 12% by weight and propylene glycol were mixed in a weight ratio of 4:1:1 and contacted for 3...

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Abstract

The invention relates to the field of ethylene polymerization, and particularly relates to an ethylene polymerization method and polyethylene produced through the method. The ethylene polymerization method includes the step of performing a polymerization reaction to ethylene under polymerization reaction conditions in the presence of a catalyst. The catalyst contains a spherical composite material and magnesium salt and/or titanium salt supported on the spherical composite material; the spherical composite material contains a mesoporous molecular sieve material having a three-dimensional cube-cage structure and silica gel. The invention also discloses polyethylene which is produced through the method. Through the method, a polyethylene product is low in bulk density and melt index and is not liable to break.

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): C08F110/02C08F4/02
CPCC08F110/02C08F2500/12C08F4/02
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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