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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 problem of insufficient catalytic activity, and achieve the effects of low melt index, reduced accumulation, and uniform particle size

Inactive Publication Date: 2018-11-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the catalytic activity of the silica gel carrier after loading the polyethylene catalyst is not high enough, and it is urgent to develop a catalyst carrier that can improve the activity to promote the further development of the carrier catalyst and the polyolefin industry

Method used

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  • Ethylene polymerization method and polyethylene
  • Ethylene polymerization method and polyethylene
  • Ethylene polymerization method and polyethylene

Examples

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Effect test

preparation example Construction

[0033] In the preparation method of the silica gel carrier in the prior art, the step of removing the template agent after spray drying is usually included, for example, the template agent is removed by a calcination method. Since the method of the present invention uses a ceramic membrane for filtration and / or washing treatment, the method for preparing the silica gel carrier of the present invention may not include the step of calcination to remove the template agent.

[0034] In the present invention, the average particle diameter of the silica gel carrier is 30-60 μm, and the specific surface area is 150-600 m 2 / g, the pore volume is 0.5-2.5mL / g, and the pore diameter is 5-25nm.

[0035] Preferably, the silica gel carrier has an average particle diameter of 30-60 μm and a specific surface area of ​​200-400 m 2 / g, the pore volume is 1-2mL / g, and the pore diameter is 10-25nm.

[0036] In the present invention, the specific surface area, pore volume and pore diameter are ...

Embodiment 1

[0067] This embodiment is used to illustrate the method for ethylene polymerization of the present invention and the obtained polyethylene

[0068] (1) Preparation of silica gel carrier

[0069] The water glass with a concentration of 15% by weight, the sulfuric acid solution with a concentration of 12% by weight and glycerol are mixed in a weight ratio of 5:1:1 and contacted for 1.5 hours at 20°C, and then the concentration is 98% by weight. sulfuric acid to adjust the pH value to 3, then suction-filter the obtained reaction material, and wash with a ceramic membrane filter until the sodium ion content is 0.02% by weight to obtain a silica gel filter cake. . Among them, the operating pressure of the membrane module is 3.3bar, the inlet membrane pressure of the circulation side is 4bar, the outlet membrane pressure of the circulation side is 2.5bar, the membrane surface velocity of the circulation side is 4m / s, the pressure of the permeation side is 0.3bar, and the temperatur...

Embodiment 2

[0084] This embodiment is used to illustrate the method for ethylene polymerization of the present invention and the obtained polyethylene

[0085] (1) Preparation of silica gel carrier

[0086] The water glass with a concentration of 15% by weight, the sulfuric acid solution with a concentration of 12% by weight and glycerol are mixed in a weight ratio of 6:3:1 and contacted for 3 hours at 60°C, and then the concentration is 98% by weight. sulfuric acid to adjust the pH value to 3, then suction-filter the obtained reaction material, and wash with a ceramic membrane filter until the sodium ion content is 0.02% by weight to obtain a silica gel filter cake. Among them, the operating pressure of the membrane module is 3bar, the inlet membrane pressure of the circulation side is 3.5bar, the outlet membrane pressure of the circulation side is 2.5bar, the membrane surface velocity of the circulation side is 4.5m / s, the pressure of the permeation side is 0.4bar, and the temperature i...

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Abstract

The invention relates to the field of polymerization and discloses an ethylene polymerization method and polyethylene prepared through the same. The ethylene polymerization method comprises, under polymerization conditions and with existence of catalysts, subjecting ethylene to polymerization, wherein the catalysts are composed of a silica-gel carrier and magnesium salt and / or titanium salt carried on the silica-gel carrier; the silica-gel carrier is prepared through the method including the following steps including (1) mixing sodium silicate, polyhydric alcohols and inorganic acids for contact, and then filtering and / or washing the obtained mixture through a ceramic film filter to obtain a silica gel filter cake, and (2) ball-milling the silica gel filter cake obtained in the step (1) and then performing spray drying to obtain the silica-gel carrier. The ethylene polymerization method is high in activity of the applied catalysts and can prepare polyethylene products low in bulk density and melt index.

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): C08F10/02C08F110/02C08F4/02
CPCC08F10/02C08F110/02C08F4/025C08F2500/18C08F2500/12Y02P20/52
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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