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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 catalytic activity, etc., and achieves stable mesoporous structure, improved fluidity, and difficulty in strength. broken effect

Active Publication Date: 2018-05-11
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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Experimental program
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preparation example Construction

[0028] In a preferred case, the preparation method of the catalyst may include: contacting the spherical mesoporous composite material with a mother liquor containing magnesium salt and / or titanium salt in the presence of an inert gas.

[0029] 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.

[0030] 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.

[0031]During the preparation of the catalyst, the magnesium salt and / or the titanium salt are preferably used in excess relative to the spherical mesoporous composite material. More preferably, the amount of the magnesium salt, the titanium salt and the spherical mesoporous composite material is suc...

Embodiment approach

[0051] The present invention has no special limitation on the conditions of the first mixing contact, for example, the conditions of the first mixing contact generally include: the temperature can be 10-60°C, preferably 10-20°C; the time can be 10-72 Hours, preferably 10-30 hours; pH value can be 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.

[0052] In the present invention, the crystallization conditions include: the temperature may be 30-150° C., preferably 40-80° C.; the time may be 10-72 hours, preferably 20-30 hours. According to a preferred embodiment, the crystallization is carried out by hydrothermal crystallization.

[0053] In step (1), in the process of preparing the filter cake of the mesoporous molecular sieve material with a one-dimensional hollow spherical pore structure, the ...

Embodiment 1

[0088] This embodiment is used to illustrate the ethylene polymerization method of the present invention and the obtained polyethylene

[0089] (1) Preparation of spherical mesoporous composites

[0090] 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 filter cake A1 of mesoporous molecular sieve material with a one-dimensional hollow spherical pore structure.

[0091] The water glass with a concentration of 15% by weight and the ...

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Abstract

The present invention relates to the field of polymerization reaction, and discloses an ethylene polymerization method. Under the conditions of polymerization reaction, ethylene is subjected to a polymerization reaction in the presence of a catalyst, wherein the catalyst contains a spherical mesoporous composite material and a magnesium salt and / or titanium salt loaded on the spherical mesoporouscomposite material, and the spherical mesoporous composite material comprises a mesoporous molecular sieve material having a one-dimensional hollow spherical pore structure. The method uses a mesoporous structure-stabilized supported catalyst to obtain a polyethylene product which has a low bulk density and melt index and is not easily broken.

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
CPCC08F110/02C08F4/025C08F4/645C08F2500/18C08F2500/12
Inventor 亢宇张明森吕新平周俊岭徐世媛张志会
Owner CHINA PETROLEUM & CHEM CORP
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