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

A technology of ethylene polymerization and catalyst, which is applied in the field of ethylene polymerization catalysts, and can solve problems such as difficult control of stability, troublesome waste liquid treatment, unsatisfactory bulk density of catalyst system, etc.

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 that 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, and its stability is difficult to control
However, the bulk density of the catalyst system prepared by the above two methods is not satisfactory yet.
In addition, although the above-mentioned catalyst system has good performance for olefin polymerization, in order to obtain the catalyst solid product in the preparation process of the above-mentioned catalyst system, the method of adding a precipitation aid is adopted, and a large amount of titanium tetrachloride is used , in the post-processing stage will bring greater trouble to waste liquid treatment

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
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Preparation of catalyst components

[0045] In the reactor fully replaced by high-purity nitrogen, 4.0g of magnesium dichloride, 120ml of toluene, 3.0ml of epichlorohydrin, 6.0ml of 2-ethylhexanol, and 8.0ml of tributyl phosphate were successively added, and the temperature was raised to 70°C, react at 70°C for 2 hours, when the solid is completely dissolved to form a uniform solution, add polyvinylpyrrolidone (M w =10000) 0.2 g to continue the reaction for 0.5 hours. Cool the reaction system to -15°C, slowly add 25ml of titanium tetrachloride dropwise, keep the temperature for 0.5 hours, then add 0.2g of 2-methoxyethyl benzoate, slowly raise the temperature to 85°C, and react at this temperature for 2 Hour. Then stop stirring, let it stand, the suspension is quickly separated into layers, the supernatant is extracted, washed four times with hexane, and dried with high-purity nitrogen to obtain a solid catalyst component with good fluidity.

[0046] (2) Ethylene ...

Embodiment 2

[0049] (1) The preparation process of the solid catalyst component is the same as in Example 1, except that the 2-methoxyethyl benzoate is changed to add 2-isopropoxyethyl benzoate, and the consumption is 0.4g.

[0050] (2) Ethylene polymerization is with embodiment 1. The aggregation results are shown in Table 1.

Embodiment 3

[0052] (1) The preparation process of the solid catalyst component is the same as in Example 1, the difference being that polyvinylpyrrolidone (M w =40000) the consumption is changed to 0.3g, and the 2-methoxyethyl benzoate is changed to add 1-methoxy-2-methylpropane-2-benzoate, and the consumption is 0.4g.

[0053] (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 ethylene 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 a magnesium compound, an organic epoxy compound, an organic alcohol compound, an organophosphorus compound, polyvinylpyrrolidone, a titanium-containing compound, and an aromatic alkoxy ester compound. The structure of the aromatic alkoxy ester compound is shown in the general formula (I). The preparation method comprises contacting a magnesium halide, an organic alcohol compound, a titanium-containing compound and an aromatic alkoxy ester compound to obtain a uniform solution, carrying out a reaction process on the solution and polyvinylpyrrolidone, cooling the reaction product, contacting the solution and a titanium-containing compound to obtain solids, and contacting the solids and an aromatic alkoxy ester compound to obtain a mixture as the catalyst component. The catalyst component has large particle sizes and narrow particle size distribution. The polymer has high bulk density and good hydrogen modulationsensitivity.

Description

technical field [0001] The invention relates to the technical field of catalysts for ethylene 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. [0003] 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 wi...

Claims

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Application Information

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IPC IPC(8): C08F10/02C08F110/02C08F4/642C08F4/651C08F4/654
CPCC08F10/02C08F110/02C08F4/6421C08F4/651C08F4/6545
Inventor 李颖曹昌文黄廷杰郭子芳周俊领苟清强杨红旭俸艳芸朱孝恒
Owner CHINA PETROLEUM & CHEM CORP