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A kind of ethylene polymerization method and polyethylene

An ethylene polymerization and polymerization reaction technology, applied in the field of polyethylene, can solve the problems of poor thermal stability and hydrothermal stability, low ethylene polymerization activity, collapse of pore walls, etc., and achieve stable mesoporous structure, high catalytic activity, and low melting point. The effect of the index

Active Publication Date: 2020-05-12
CHINA PETROLEUM & CHEM CORP +1
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  • 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
[0007] In addition, the preparation cost of the currently used supported polyethylene catalyst is high. In order to further improve the efficiency, it is necessary to find a new mesoporous material, which can not only reduce the catalyst preparation cost, but also ensure the activity of the catalyst, and at the same time improve the performance of polyethylene products

Method used

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  • A kind of ethylene polymerization method and polyethylene
  • A kind of ethylene polymerization method and polyethylene
  • A kind of ethylene polymerization method and polyethylene

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preparation example Construction

[0026] In a preferred case, the preparation method of the catalyst may include: in the presence of an inert gas, impregnating the spherical zeolite mesoporous composite material in a mother liquor containing magnesium salt and / or titanium salt, followed by filtering and drying in sequence.

[0027] According to 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.

[0028]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 catalyst, the total amount of the catalyst is Based on weight, the content of the spherical zeolite mesoporous composite material is 90-99% by weight, and the sum of the contents of the magnesium salt and titanium salt in ter...

Embodiment 1

[0086] This example is used to illustrate the ethylene polymerization method and the obtained polyethylene of the present invention.

[0087] (1) Preparation of spherical zeolite mesoporous composites

[0088] 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;

[0089] 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;

[0090] Then it was transferred to an agate-lined reactor, crystallized at 100°C for 24 hours, then filtered and washed 4 times with deionized water, and then suction filtered to obtain a mesoporous molecular sieve material with a three-dimensional cubic cage-like channel structure. Filter cake A1.

[0091] 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

[0107] This example is used to illustrate the ethylene polymerization method and the obtained polyethylene of the present invention.

[0108] (1) Preparation of spherical zeolite mesoporous composites

[0109] 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;

[0110] Add 3.1g (0.015mol) tetraethyl orthosilicate to the above solution, stir at 45°C for 15min, and stand at 45°C for 30h;

[0111] Then it was transferred to an agate-lined reactor, crystallized at 120°C for 30 hours, then filtered and washed 4 times with deionized water, and then suction filtered to obtain a mesoporous molecular sieve material with a three-dimensional cubic cage-like channel structure. Filter cake A2.

[0112] Concentration is 20% by weight of water glass and concentration of 12% by weight of sulfuric acid solution and glycerol mixed with a weight ratio of 4:1:1 and contact ...

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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 zeolite mesoporous composite material and magnesium salt and / or titanium salt supported thereon. The spherical zeolite mesoporous composite material contains zeolite and a mesoporous molecular sieve material having a three-dimensional cube-cage pore structure. The invention also discloses polyethylene produced through the method. By means of the ethylene polymerization method, a polyethylene product being low in bulk density and melt index and being not liable to break can be 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 Patents(China)
IPC IPC(8): C08F110/02C08F4/643C08F4/02
CPCC08F110/02C08F4/643C08F4/02
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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