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A kind of preparation method for olefin polymerization catalyst

A technology for olefin polymerization and catalysts, which is applied in the field of preparation of olefin polymerization catalysts, and can solve problems such as limited use, poor catalyst fluidity, and low polymer melt index

Active Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of these compounds tends to be limited due to safety and health concerns, such as possible effects on fertility
There are literatures disclosing the use of other ester compounds as precipitation aids, such as preparing catalysts with cyclohexanedicarboxylate compounds as precipitation aids. The catalyst particle size prepared by this method is large, and it is easily broken during the polymerization process, and the obtained polymerization The melt index of the material is low, and the bulk density of the polymer is also low, which is not conducive to packaging and transportation
CN101643529A discloses the preparation of catalysts with diol ester compounds as precipitation aids. In the process of preparing catalysts by this method, the catalyst particles are not easy to settle, and the final catalyst fluidity is not good, and it is easy to gather into blocks. When used for olefin polymerization, hydrogen Poor tuning sensitivity

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Under the protection of nitrogen, add 4.8g of anhydrous magnesium chloride, 19.5g of isooctyl alcohol and 19.5g of decane solvent into a 500ml reactor equipped with a stirrer, heat to 130°C, react for 1.5 hours until the magnesium chloride is completely dissolved, add 2.0g Diethyl diisobutylmalonate, continue to react at 130°C for 1 hour to obtain an alcoholate; cool the alcoholate to room temperature. Under the protection of nitrogen, the above alcoholate was added dropwise to 120ml of titanium tetrachloride solution precooled to -22°C, and the temperature was slowly raised to 100°C, and solids were gradually precipitated during the heating process. Then add 10 mmol of 3,5-heptanediol dibenzoate compound to the solid, raise the temperature to 110°C for 2 hours, filter while hot, add 120 ml of titanium tetrachloride, raise the temperature to 110°C for 1 hour ,filter. The filtered solid particles were washed 4 times with anhydrous hexane, and dried to obtain a solid cat...

Embodiment 2

[0042] The method is the same as in Example 1, except that diethyl phenyl ethyl malonate is used to replace diethyl diisobutyl malonate. Example 3

Embodiment 3

[0043] The method is the same as in Example 2, except that 1.2 g of diethyl phenylethylmalonate is used.

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Abstract

The invention discloses a method for preparing a catalyst component for polymerizing olefins. The method comprises the following steps: a) dissolving a magnesium compound in a solvent system containing a compound as shown in general formula (I) and an organic alcohol compound to obtain a solution, and adding a precipitation agent to precipitate solids in the solution; and b) performing treatment on the solids in the step a) with a titanium compound, wherein an internal electron donor is added in the process of performing treatment on the solids with the titanium compound and / or before the treatment. Compared with the prior art, the catalyst provided by the invention has higher safety coefficient, higher catalytic activity and better hydrogen regulation sensitivity, and an obtained polymer has higher stacking density.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for olefin polymerization and a catalyst component. Furthermore, the present invention also relates to a catalyst for olefin polymerization comprising the above components. Further, the present invention also relates to a polymerization method using the above-mentioned catalyst. Background technique [0002] The preparation of the magnesium chloride supported catalyst usually first activates the magnesium chloride by chemical method, and then treats the highly active magnesium chloride with a titanium compound. Chemical activation of magnesium chloride generally first dissolves magnesium chloride in a solvent system, then removes the solvent by heat treatment or adds a precipitation agent to re-precipitate magnesium chloride from the solution, and uses techniques such as adding a precipitation agent to re-precipitate magnesium chloride from the solution. It is necessary to add a precipitation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F4/649C08F10/02C08F10/06
Inventor 高明智蔡晓霞刘海涛马吉星陈建华王军胡建军李现忠马晶李昌秀
Owner CHINA PETROLEUM & CHEM CORP