Ethylene polymerization method and polyethylene

A technology for ethylene polymerization and polymerization reaction, applied in the field of polyethylene, can solve the problems of poor thermal stability and hydrothermal stability, low ethylene polymerization activity, affecting loading effect, etc., and achieve stable mesoporous structure, improve fluidity, and facilitate application. Effect

Active Publication Date: 2018-05-08
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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Embodiment approach

[0021] According to a preferred embodiment of the present invention, the average particle diameter of the spherical porous mesoporous composite material is 22-28 microns, the specific surface area is 220-300 square meters per gram, and the pore volume is 1.1-1.7 milliliters per gram, The pore size has a trimodal distribution, and the three peaks correspond to the first most probable pore diameter of 6-9 nanometers, the second most probable pore diameter of 22-32 nanometers and the third most probable pore diameter of 42-50 nanometers;

[0022] According to a more preferred embodiment of the present invention, the average particle diameter of the spherical porous mesoporous composite material is 23-27 microns, the specific surface area is 220-275 square meters per gram, and the pore volume is 1.2-1.5 milliliters per gram , the pore size is distributed in three peaks, and the three peaks correspond to the first most probable pore diameter of 7-8 nanometers, the second most probab...

Embodiment 1

[0095] This embodiment is used to illustrate the ethylene polymerization method of the present invention and the obtained polyethylene

[0096] (1) Preparation of spherical porous mesoporous composites

[0097] 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 crystallizing in an oven at 60°C for 24 hours in a reaction kettle, filter and wash with deionized water for 4 times, and then filter with suction to obtain a filter cake A11 of mesoporous molecular sieve material with a one-dimensional straight-through channel structure.

[0098] At 80°C, cetyltrimethylammonium bromide and tetra...

Embodiment 2

[0116] This embodiment is used to illustrate the ethylene polymerization method of the present invention and the obtained polyethylene

[0117] (1) Preparation of spherical porous mesoporous composites

[0118] 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, crystallize in an oven at 80°C for 20 hours, then filter and wash with deionized water for 6 times, and then suction filter to obtain filter cake A21 of mesoporous molecular sieve material with a one-dimensional hollow spherical pore structure.

[0119] At 50°C, cetyltrimethylammonium bromide and tetraethyl orthosilicate are added to the amm...

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Abstract

The present invention relates to the field of polymerization reactions, and discloses an ethylene polymerization method and polyethylene obtained through the ethylene polymerization method. The ethylene polymerization method comprises: carrying out a polymerization reaction on ethylene in the presence of a catalyst under a polymerization reaction condition, wherein the catalyst contains a spherical porous mesoporous composite material and a magnesium salt and/or a titanium salt supported on the spherical porous mesoporous composite material, and the spherical porous mesoporous composite material contains a mesoporous molecular sieve material with a one-dimensional through-hole structure, and a mesoporous molecular sieve material with a hexagonal pore channel structure. According to the present invention, the supported catalyst with the stable mesoporous structure is used, such that the polyethylene product with characteristics of low bulk density, low melt index and breaking resistancecan 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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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F4/10C08F4/16C08F4/02
CPCC08F110/02C08F4/10C08F4/16C08F4/02C08F4/025C08F2500/18C08F2500/12
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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