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Ethylene polymerization method and polyethylene

A technology of ethylene polymerization and polymerization reaction, which is applied in the field of polyethylene, can solve the problems of poor thermal stability and hydrothermal stability, low ethylene polymerization activity, and affect the loading effect, etc., achieve stable mesopore structure, good fluidity, and reduce production cost 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

[0029] In a preferred case, the preparation method of the catalyst may include: contacting the spherical illite mesoporous composite material with a mother liquor containing magnesium salt and / or titanium salt in the presence of an inert gas.

[0030] Preferably, the contacting conditions include: a temperature of 25-100° C., preferably 40-60° C.; a time of 0.1-5 h, preferably 1-3 h.

[0031] The mother liquor that contains magnesium salt and / or titanium salt can be the organic solvent that contains magnesium salt and / or titanium salt, and described organic solvent can be Virahol and tetrahydrofuran, and the volume ratio of tetrahydrofuran and Virahol can be 1: 1-3, preferably 1:1-1.5.

[0032]During the preparation of the catalyst, the amount of the magnesium salt and / or the titanium salt is preferably in excess relative to the spherical illite mesoporous composite material. More preferably, the amount of the magnesium salt, the titanium salt and the spherical illite mesopor...

Embodiment approach

[0047] In the present invention, the conditions of the first mixed contact include: the temperature may be 10-60°C, preferably 25-60°C; the time may be 10-72 hours, preferably 10-30 hours; the pH value is 1- 7, preferably 3-6. In order to be more conducive to uniform mixing among the various substances, according to a preferred embodiment of the present invention, the first mixing and contacting is performed under stirring conditions.

[0048] In the present invention, the crystallization conditions include: the temperature may be 30-150° C., preferably 90-150° C.; the time may be 10-72 hours, preferably 10-40 hours. According to a preferred embodiment, the crystallization is carried out by hydrothermal crystallization.

[0049] In the present invention, in the process of preparing the filter cake of the mesoporous molecular sieve material having a three-dimensional cubic cage-like pore structure, the process of obtaining the filter cake by filtering may include: washing afte...

Embodiment 1

[0082] This example is used to illustrate the ethylene polymerization method and the obtained polyethylene of the present invention.

[0083] (1) Preparation of spherical illite mesoporous composites

[0084] With 1.46g (0.0001mol) template F108, 5.24g (0.03mol) of K 2 SO 4 Stir with 60g of hydrochloric acid solution with a normality of 2 (2N) at 38°C until F108 is completely dissolved;

[0085] Add 4.2g (0.02mol) of tetraethyl orthosilicate to the above solution, stir at 38°C for 15 minutes, and stand at 38°C for 24 hours;

[0086] Then it was transferred to an agate-lined reaction kettle, crystallized at 100°C for 24 hours, then filtered and washed 4 times with deionized water, and dried to obtain the original powder mesoporous material; the original powder mesoporous material was washed with ethanol Reflux washing at 78° C. for 24 hours, and then suction filtration to obtain a filter cake A1 of mesoporous molecular sieve material with a three-dimensional cubic cage-like ...

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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 method includes the steps of in the presence of a catalyst, polymerizing ethylene under polymerization reaction conditions, wherein a catalyst contains a spherical illite mesoporous composite material and magnesium salt and / or titanium salt supported thereon. By means of the supported catalyst having stable mesoporous structure, 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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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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