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A kind of catalyst for olefin polymerization and olefin polymerization method

A technology for olefin polymerization and catalysts, which is applied in the field of olefin polymerization catalysts and olefin polymerization catalysts. It can solve the problems of olefin polymerization catalyst application limitations, difficulty in controlling polymer properties, etc., and achieve a wide range of applications.

Active Publication Date: 2021-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for these catalysts to control the properties of polymers (such as isotacticity, melt index) by adjusting the amount of external electron donors to a certain extent under the condition that the type of external electron donor remains unchanged, leading to the application of olefin polymerization catalysts restricted

Method used

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  • A kind of catalyst for olefin polymerization and olefin polymerization method
  • A kind of catalyst for olefin polymerization and olefin polymerization method
  • A kind of catalyst for olefin polymerization and olefin polymerization method

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preparation example Construction

[0064] Specifically, the preparation method of the spherical magnesium halide alkoxide carrier may include: mixing magnesium halide and low-carbon alcohol, heating and reacting to form a magnesium halide alcoholate melt, the reaction temperature is 90-140°C, Put it into the cooling inert medium after being subjected to high-shearing action to form spherical magnesium halide alcoholate particles, and obtain spherical carriers after washing and drying. High shear can be obtained by conventional methods, such as high-speed stirring method (for example, CN00109216.2), spray method (for example, US6020279A) and high gravity rotating bed (for example, CN1580136A) and emulsifier method (for example, CN1463990A) etc. . The dispersant system can use hydrocarbon inert solvents, such as kerosene, white oil, silicone oil, paraffin oil, vaseline oil, etc. The cooling inert medium can be selected from pentane, hexane, heptane, petroleum ether, raffinate and the like.

[0065] The general ...

Embodiment approach

[0068] According to a preferred embodiment, the solid catalyst component is prepared by a method comprising the following steps:

[0069] 1) Mixing the titanium compound with a spherical magnesium halide alkoxide carrier at a temperature of -30°C to 0°C to obtain a mixture;

[0070] 2) raising the temperature of the mixture to 80-130° C., adding the composite internal electron donor compound to react during the heating process to obtain a solid precipitate;

[0071] 3) Washing and drying the solid precipitate to obtain the solid catalyst component. Optionally, in step 3), the solid precipitate is treated with a titanium compound before washing. The treatment can be performed one or more times. The inert solvent used for washing can be selected from one or more of hexane, heptane, octane, decane and toluene.

[0072] In addition, in step 1), the mixing is optionally performed in the presence of an inert solvent.

[0073] During the preparation of the catalyst component of t...

preparation example 1

[0088] This preparation example is used to illustrate the preparation method of diol ester compound 2,4-pentanediol dibenzoate.

[0089] (1) Preparation of 2,4-pentanediol

[0090] A mixture of 10g 2,4-pentanedione and 30mL methanol was added dropwise to a mixed solution of 2.5g sodium borohydride, 0.1g sodium hydroxide and 25mL water at 0-10°C. After the addition was complete, the solvent was removed under reduced pressure. Continuous extraction with 40mL ethyl acetate for 15h. The solvent was removed and column chromatography was used to obtain 2,4-pentanediol as a colorless liquid with a yield of 90%.

[0091] (2) Preparation of 2,4-pentanediol dibenzoate

[0092] Add 30mL tetrahydrofuran and 0.09mol pyridine to 0.03mol 2,4-pentanediol, add 0.075mol benzoyl chloride under stirring, and heat to reflux for 4h. After cooling, add 20mL saturated brine, then extract with ethyl acetate, anhydrous Na 2 SO 4 Dry and remove solvent. Column chromatography gave 2,4-pentanediol d...

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Abstract

The invention belongs to the field of olefin polymerization catalysts, and provides a catalyst for olefin polymerization and an olefin polymerization method. The catalyst comprises the reaction product of the following components: (1) a solid catalyst component; (2) an aluminum alkyl compound; (3) a composite external electron donor compound comprising alkoxyphenyl Carboxylate compound and hydrocarbyl dihydrocarbyl oxysilane; the structure of alkoxy phenyl carboxylate compound is shown in formula (II), and the structure of hydrocarbyl dihydrocarbyl oxysilane is shown in formula (III). The catalyst of the present invention can prepare polymers with different properties by adjusting the ratio under the condition that the total amount of the external electron donor remains unchanged.

Description

technical field [0001] The invention belongs to the field of olefin polymerization catalysts, and in particular relates to a catalyst for olefin polymerization and an olefin polymerization method. Background technique [0002] As we all know, the catalyst system used in the polymerization of ethylene, α-olefins and their mixtures generally consists of three parts, including: (1) main catalyst (solid catalyst component), (2) co-catalyst (usually alkyl Aluminum compound) and (3) external electron donor compound added during polymerization. [0003] One or several external electron donor compounds are used during the polymerization to control the stereoregularity and morphology of the polymer. In addition to affecting the stereoregularity of the polymer, the external electron donor often affects the activity and hydrogenation sensitivity of the catalyst to varying degrees, but this effect is often reflected in a positive effect in one aspect, and in other aspects. It will hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F110/06C08F4/649C08F4/646
CPCC08F10/00C08F110/06C08F4/6494C08F4/6465C08F2500/15C08F2500/12
Inventor 张天一夏先知张志会刘月祥段瑞林万真凌永泰高富堂赵瑾马长友
Owner CHINA PETROLEUM & CHEM CORP
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