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Catalyst component for ethylene polymerization, preparation method thereof, and catalyst for ethylene polymerization

A technology for ethylene polymerization and catalysts, which is applied in the field of ethylene polymerization catalysts and can solve the problems of low catalyst activity, increased sensitivity to hydrogen adjustment, and high price

Active Publication Date: 2018-07-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this traditional method is: the particle size and particle size distribution of the catalyst particles are completely controlled by the precipitation process, that is, the recrystallization process of the magnesium carrier component, the particle shape is difficult to control, and the sensitivity to hydrogen adjustment needs to be further improved
[0003] The second method is to prepare polyolefin catalysts with organomagnesium compounds as raw materials. This method can usually obtain catalysts with better particle shape and better hydrogenation sensitivity , but the activity of the obtained catalyst is lower than that of magnesium chloride as raw material
In the foreign patent document US7256150B2, butyl octyl magnesium is dissolved in ethyl hexanol, phthaloyl chloride and chlorobutane to form an emulsion, and then reacted with titanium tetrachloride to form a polypropylene catalyst, which is used for gas phase reactions. But butyl octyl magnesium is relatively expensive as a raw material, which is not conducive to industrial production

Method used

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  • Catalyst component for ethylene polymerization, preparation method thereof, and catalyst for ethylene polymerization
  • Catalyst component for ethylene polymerization, preparation method thereof, and catalyst for ethylene polymerization
  • Catalyst component for ethylene polymerization, preparation method thereof, and catalyst for ethylene polymerization

Examples

Experimental program
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Effect test

Embodiment 1

[0042] (1) Preparation of catalyst components

[0043] In the reactor fully replaced by high-purity nitrogen, 4.5g of diethoxymagnesium, 120ml of toluene, 10.0ml of epichlorohydrin, and 10.0ml of ethyl silicate were sequentially added, and the temperature was raised to 100°C under stirring. A homogeneous solution was obtained by reacting at temperature for 3 hours. The temperature of the above solution was lowered to -10°C, and 25 ml of titanium tetrachloride was slowly added dropwise over 1 hour, and the temperature was kept constant for 30 minutes after the addition was completed. Then heat up to 30°C, slowly add 0.5g 2-methoxyethyl benzoate, and react for 1 hour. Then slowly raise the temperature to 85°C, and react at 85°C for 2 hours. Then lower the temperature, stop stirring, leave standstill, the suspension will be layered very quickly, the supernatant is extracted, washed four times with hexane, and dried with high-purity nitrogen to obtain a solid catalyst component ...

Embodiment 2

[0047] (1) The preparation process of the catalyst component is the same as in Example 1, except that the 2-methoxyethyl benzoate is changed into the 2-isopropoxyethyl benzoate that consumption is 1.0g , reacted for 1 hour, and the experimental results are shown in Table 2.

[0048] (2) Ethylene polymerization is the same as in Example 1, and the polymerization results are shown in Table 1.

Embodiment 3

[0050] (1) The preparation process of the catalyst component is the same as in Example 2, except that 2-isopropoxy ethyl benzoate is changed into 1-methoxy-2-methylpropane-2-benzyl acid ester, the consumption is changed to 1.5g, and the experimental results are shown in Table 2.

[0051](2) Ethylene polymerization is with embodiment 1. The aggregation results are shown in Table 1.

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Abstract

The invention relates to the technical field of catalysts for olefin polymerization, and provides a catalyst component for ethylene polymerization, a preparation method thereof, and a catalyst for ethylene polymerization. The catalyst component comprises reaction products of (1) a magnesium compound, (2) an organic epoxy compound, (3) an organosilicon compound, (4) a titanium-containing compound and (5) an aromatic alkoxy ester compound. The structure of the aromatic alkoxy ester compound is shown in the formula (I). The method comprises contacting a magnesium compound, an organic epoxy compound and an organosilicon compound for a reaction to form a homogeneous solution, cooling the reaction product to -40 to 10 DEG C, contacting the cooled product and a titanium-containing compound for areaction to obtain a mixture, contacting the mixture and an aromatic alkoxy ester compound, and slowly heating the mixture for a reaction to obtain the catalyst component. The catalyst component has good particle shapes, high catalytic activity and good hydrogen modulation sensitivity. The polymer has high bulk density.

Description

technical field [0001] The invention relates to the technical field of catalysts for olefin polymerization, and more specifically, to a catalyst component for ethylene polymerization, a preparation method thereof and a catalyst for ethylene polymerization. Background technique [0002] As we all know, the catalyst system containing Ti / Mg composites plays a dominant role in the industrial production of polyolefins, and the core of its research is nothing more than the polymerization activity of the catalyst, the particle shape and particle size distribution of the catalyst, the hydrogenation sensitivity and Copolymerization properties, etc. In the prior art, in order to obtain a catalyst with a uniform particle diameter and a good particle shape, people usually use different magnesium raw materials to prepare the catalyst. The first method is to dissolve magnesium chloride as a raw material in some solvent to obtain a uniform solution, and then mix the solution with a titani...

Claims

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Application Information

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IPC IPC(8): C08F10/02C08F110/02C08F4/649C08F4/646C08F4/651C08F4/654C08F4/656C08F2/34
CPCC08F10/02C08F110/02C08F4/6494C08F4/6465C08F4/651C08F4/6546C08F4/6565C08F2/34C08F2500/18C08F2500/12C08F2500/24Y02P20/52
Inventor 李颖郭子芳周俊领苟清强杨红旭曹昌文朱孝恒俸艳芸
Owner CHINA PETROLEUM & CHEM CORP