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A catalyst component for ethylene polymerization, its preparation method and application

A technology for ethylene polymerization and catalysts, which is applied in the field of supported chromium-based catalyst components, and can solve the problems of undisclosed chromium-based catalyst systems, etc.

Active Publication Date: 2019-08-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no chromium-based catalyst system disclosed in the prior art, which has good activity during polymerization and can obtain polymers with a wide molecular weight distribution

Method used

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  • A catalyst component for ethylene polymerization, its preparation method and application
  • A catalyst component for ethylene polymerization, its preparation method and application
  • A catalyst component for ethylene polymerization, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Take 10g of silica gel (W.R.Grece&Co.–Com 955, the pore volume is about 1.1-1.8cm 3 / g, the surface area is about 245-375m 2 / g) Dry at 200° C. for 4 hours under nitrogen fluidization. Add 0.5 g of bis(triphenylsilyl) chromate into the reactor fully replaced with anhydrous and oxygen-free nitrogen, then add 300 ml of hexane, stir at room temperature to completely dissolve the solid to form a solution. Add 10g of dried silica gel to the above solution, after stirring, add 2ml (1.3M) diethylethoxyaluminum hexane solution, stir at room temperature for 1 hour, then add 2.4mmol of 5,5-dimethyl base-2-phenyl-1,3,2-dioxaborane, stirred at room temperature for 1 hour, and then removed the solvent to obtain a chromium-containing catalyst component. The polymerization evaluation results of the catalysts are listed in Table 1.

Embodiment 2

[0052] Take 10g of silica gel (W.R.Grece&Co.–Com 955, the pore volume is about 1.1-1.8cm 3 / g, the surface area is about 245-375m 2 / g) Dry at 200° C. for 4 hours under nitrogen fluidization. Add 0.5 g of bis(triphenylsilyl) chromate into the reactor fully replaced with anhydrous and oxygen-free nitrogen, then add 300 ml of hexane, stir at room temperature to completely dissolve the solid to form a solution. Add 10 g of dried silica gel to the above solution, then add 2.4 mmol of 5,5-dimethyl-2-phenyl-1,3,2-dioxaborane after stirring, and stir at room temperature for 1 hour Then, 2 ml (1.3 M) of a hexane solution of diethylethoxyaluminum was added, and after stirring at room temperature for 1 hour, the solvent was removed to obtain a chromium-containing catalyst component. The polymerization evaluation results of the catalysts are listed in Table 1.

Embodiment 3

[0054] Take 10g of silica gel (W.R.Grece&Co.–Com 955, the pore volume is about 1.1-1.8cm 3 / g, the surface area is about 245-375m 2 / g) Dry at 200° C. for 4 hours under nitrogen fluidization. Add 0.5 g of bis(triphenylsilyl) chromate into the reactor fully replaced with anhydrous and oxygen-free nitrogen, then add 300 ml of hexane, stir at room temperature to completely dissolve the solid to form a solution. Add 10 g of dried silica gel to the above solution, and simultaneously add 2 ml (1.3 M) of diethylethoxyaluminum in hexane and 2.4 mmol of 5,5-dimethyl-2-phenyl-1 , 3,2-dioxaborane, stirred at room temperature for 2 hours and then removed the solvent to obtain a chromium-containing catalyst component. The polymerization evaluation results of the catalysts are listed in Table 1.

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Abstract

The invention provides a catalyst component used in ethylene polymerization, which includes a chromium compound, an organic aluminum compound and an organic boron compound that are all supported on a carrier, wherein the structure formula of the organic boron compound is represented as the formula (I). The invention also provides a preparation method of the catalyst component, and an ethylene polymerization catalyst based on the catalyst component. The catalyst has excellent polymerization activity when being used in ethylene homopolymerization or copolymerization of ethylene and [alpha]-olefins. The catalyst can be used for producing polyethylene with wide molecular weight distribution.

Description

technical field [0001] The invention relates to a supported chromium series catalyst component, a preparation method of the catalyst component and its application in ethylene polymerization. Background technique [0002] Ethylene polymers have been widely used as various articles, and ethylene polymers are required to have different properties depending on processing methods and purposes. For example, polymers with lower molecular weights and narrow molecular weight distributions are suitable for articles made into films by injection molding. On the other hand, polymers with higher molecular weight and broad molecular weight distribution are suitable for articles made into films by blown or air-filled film processes. Medium to high molecular weight polyethylenes with sufficient strength and good processability are required in many applications such as pipe applications. [0003] Ethylene polymers with a broad molecular weight distribution can be prepared using chromium-bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F4/69C08F10/02
Inventor 崔楠楠王洪涛周俊领闫力欣万艳红刘树军
Owner CHINA PETROLEUM & CHEM CORP
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