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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 affecting loading effect, etc., achieve stable mesopore structure, improve fluidity, and facilitate application Effect

Active Publication Date: 2018-03-27
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
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  • Ethylene polymerization method and polyethylene

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Embodiment approach

[0021] According to a preferred embodiment of the present invention, the average particle diameter of the spherical small-diameter mesoporous composite material is 22-28 microns, the specific surface area is 250-350 square meters per gram, and the pore volume is 1.0-1.5 milliliters / gram. grams, the pore size is bimodal, and the most probable pore sizes corresponding to the bimodal are 5-10 nanometers and 20-35 nanometers;

[0022] According to a more preferred embodiment of the present invention, the average particle diameter of the spherical small particle mesoporous composite material is 23-27 microns, the specific surface area is 300-340 square meters per gram, and the pore volume is 1.1-1.4 ml / g, the pore size distribution is bimodal, and the most probable pore sizes corresponding to the bimodal are 6-9 nanometers and 25-35 nanometers respectively.

[0023] In the present invention, the average particle diameter of the spherical small particle diameter mesoporous composit...

Embodiment 1

[0089] This example is used to illustrate the ethylene polymerization method and the obtained polyethylene of the present invention.

[0090] (1) Preparation of spherical small particle size mesoporous composites

[0091] 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;

[0092] 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;

[0093] 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.

[0094] The water glass with a concentration of 15% by weight and the sulfuric acid solution and glycerin with a concentration of 12% by 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 small particle size mesoporous composites

[0113] With 1.46g (0.0001mol) template F108, 6.96g (0.04mol) 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;

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

[0115] 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.

[0116] A concentration of 20% by weight of water glass and a concentration of 12% by weight of sulfuric acid solution and glycerol are mixed with...

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Abstract

The present invention relates to the field of polymerization reactions, and discloses an ethylene polymerization method and polyethylene prepared through the method. According to the method, under a polymerization reaction condition, ethylene is subjected to a polymerization reaction in the presence of a catalyst, wherein the catalyst contains a spherical small-particle size mesoporous composite material and a magnesium salt and / or a titanium salt supported on the spherical small-particle size mesoporous composite material, and the spherical small-particle size mesoporous composite material contains a mesoporous molecular sieve material with a three-dimensional cubic cage-like pore channel structure. According to the present invention, the method uses the supported catalyst with the stablemesoporous structure, such that the polyethylene product with characteristics of low bulk density, low melt index and breaking resistance can be obtained.

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] Since Mobile’s synthetic mesoporous materials with highly ordered pores have been synthesized in 1992, due to their high specific surface area, regular pore structure and narrow pore size distribution, mesoporous materials have been widely used in the fields of catalysis, separation, and medicine. Great attention. In 1998, Zhao Dongyuan and others synthesized a new type of material - mesoporous material SBA-15, which has highly ordered pore size (6-30nm), large pore volume (1.0cm 3 / g), thicker pore wall (4-6nm), high mechanical strength and good catalytic adsorption performance (see D.Y.Zhao, J.L.Feng, Q.S.Huo, et al Science 279 (1998) 548-550). CN1341553A discloses a method for preparing a mesoporous molecular sieve carrier material. The mesoporous material prepar...

Claims

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Application Information

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IPC IPC(8): C08F110/02C08F4/645C08F4/02
CPCC08F110/02C08F4/025C08F4/645
Inventor 亢宇张明森吕新平周俊领徐世媛张志会
Owner CHINA PETROLEUM & CHEM CORP
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