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Preparation methods for olefin polymerization catalyst component and corresponding catalyst

A technology for olefin polymerization and catalysts, which is applied in the field of rapid preparation of olefin polymerization catalyst components, and can solve the problems of reducing the content of catalyst fine powder, polymer fine powder content, equipment pipeline blockage, and shortening the dissolution time of carrier magnesium halide, etc.

Active Publication Date: 2014-01-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present inventors found that introducing a small amount of pyrrolidone compounds into the above catalyst system can greatly shorten the dissolution time of the carrier magnesium halide under the premise of keeping the activity of the catalyst and the shape of the particles unchanged, and can effectively reduce the catalyst fine powder content and The polymer fine powder content obtained by using the catalyst can well solve the time bottleneck in the preparation process of the catalyst and the problem that too much polymer fine powder content can easily cause equipment pipeline blockage; in addition, some pyrrolidone compounds with special structures It can also effectively improve the activity of the catalyst

Method used

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  • Preparation methods for olefin polymerization catalyst component and corresponding catalyst
  • Preparation methods for olefin polymerization catalyst component and corresponding catalyst
  • Preparation methods for olefin polymerization catalyst component and corresponding catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of olefin polymerization catalyst components: In an atmospheric pressure reactor repeatedly replaced by high-purity nitrogen, 4.8 grams of anhydrous magnesium chloride, 70 milliliters of toluene, 4.0 milliliters of epichlorohydrin, 12.5 milliliters of tributyl phosphate and 0.2 milliliters of N-Methylpyrrolidone, at a temperature of 60°C, react for 50 minutes to completely dissolve the carrier, add 1.4 grams of phthalic anhydride (co-eluting agent) and 30 ml of toluene, continue the reaction for one hour, and cool to -28 ℃, add 56 ml of titanium tetrachloride dropwise (the dropping rate is 1 ml / min), gradually raise the temperature to 85 °C (the heating rate is 5 °C / min), and add 1.1 ml of di-n-butyl phthalate at 80 °C (DNBP, internal electron donor), keep the temperature for one hour, filter, wash the solid twice with toluene, then add 48 ml of titanium tetrachloride and 72 ml of toluene, keep the temperature at 110°C for 0.5 hours and filter, repeat this op...

Embodiment 1B

[0041] The catalyst component is used to catalyze the polymerization of propylene (Example 1B): only change "1 liter of hydrogen under standard state" in Example 1A to "4 liters of hydrogen under standard state", and the rest are the same as in Example 1A.

Embodiment 2

[0043] Preparation of olefin polymerization catalyst components: the experimental conditions were basically the same as those in Example 1, except that the amount of N-methylpyrrolidone was changed to 0.5 ml, and the reaction time at 60° C. was changed to 35 minutes. In the prepared olefin polymerization catalyst component, by weight, the titanium content is 2.2%, the DNBP content is 12.50%, the magnesium content is 19%, the chlorine content is 64%, and the phosphorus content is 0.19%.

[0044] The catalyst component is used to catalyze the polymerization of propylene (Example 2A): the experimental conditions are basically the same as in Example 1A, except that the catalyst component prepared in Example 2 is used instead, and the specific results are shown in Table 1.

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Abstract

The invention provides a preparation method for an olefin polymerization catalyst component. The preparation method comprises the steps: contacting a magnesium compound, an organophosphorus compound, a pyrrolidone compound and an organic epoxy compound in a solvent to form a uniform solution; in the presence of a precipitation aiding agent, contacting the uniform solution with a titanium compound to obtain a mixture; and then contacting the obtained mixture with an internal electron donor compound, and carrying out a reaction to obtain the olefin polymerization catalyst component, wherein at least one of the magnesium compound and the titanium compound is a halogen-containing compound. According to the preparation method, the addition of the pyrrolidone compound can effectively shorten the preparation time of the catalyst component, improve the particle morphology of a catalyst and greatly reduce the fine powder content of the polymer; and at the same time, after addition of the pyrrolidone compound, the catalyst activity can be basically maintained or improved, the apparent density of the polymer is relatively high, and the degree of isotacticity and the polymer melt flow index still maintain original relatively good performance of the catalyst.

Description

technical field [0001] The invention relates to a method for rapidly preparing olefin polymerization catalyst components and corresponding catalysts. Background technique [0002] At present, the conventional preparation method of olefin polymerization catalyst is co-precipitation method. Magnesium halide is dissolved in a solvent system to form a uniform solution, and then active magnesium halide is precipitated with titanium halide, and the titanium active component is loaded on it at the same time. Patent CN85100997A discloses a catalyst system for olefin polymerization and copolymerization, which catalyst system includes: a Ti-containing solid catalyst component, an alkyl aluminum compound and organosilicon, wherein the preparation method of the Ti-containing solid catalyst component is , Magnesium halide is dissolved in organic epoxy compound and organic phosphorus compound to form a uniform solution, the solution is mixed with titanium tetrahalide or its derivatives, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F4/654C08F4/651C08F4/649
Inventor 付梅艳郭正阳雷世龙任春红王迎王宇刘翠莲洪挺
Owner CHINA PETROLEUM & CHEM CORP
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