Main catalyst component for alkene polymerization and catalyst

A technology of olefin polymerization and main catalyst, applied in the field of catalysts, can solve problems such as difficult stability control, achieve narrow particle size distribution, reduce production costs, and easily obtain raw material components

Active Publication Date: 2016-07-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the particle size and particle size distribution of the catalyst particles are completely controlled by the precipitation process, and it is difficult to control its stability due to the recrystallization process of the magnesium carrier component.

Method used

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  • Main catalyst component for alkene polymerization and catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Preparation of main catalyst components

[0061] 1) Weigh 10.2g of magnesium chloride, add 78mL of tetra-n-butoxytitanium (hereinafter also referred to as "tetrabutyl titanate"), stir and dissolve at 140°C until a transparent mixed solution is formed, and lower the temperature of the mixed solution to to room temperature, add 200mL of dry hexane to dilute and set aside.

[0062] 2) Take 20 mL of the mixed solution obtained in the above step 1), and slowly drop the mixed solution into the mixed solution formed by 30 mL of hexane and 20 mL of silicon tetrachloride at room temperature. After the dropwise addition, the reaction was stirred and reacted at a bath temperature of 45° C. for 1 hour, and at a bath temperature of 65° C. for 2 hours, thereby obtaining a solid suspension.

[0063] 3) Add 0.3 mL of phthaloyl chloride to the solid suspension obtained in the above step 2, stir and react at 90° C. for 1 hour, stop stirring, and let the solid settle. After removing th...

Embodiment 2

[0076] Except that the amount of phthaloyl chloride in step 3) was adjusted from 0.3 milliliters to 0.5 milliliters, the main catalyst component was prepared in the same manner as in Example 1.

[0077] The results of average particle diameter and particle size distribution measurement show that the average particle diameter (D 50 ) was 26 μm, and the particle size distribution width (Span) was 0.7. The catalyst activity and the sieving results of the polypropylene powder are shown in Table 1 below.

Embodiment 3

[0079] The main catalyst component was prepared in the same manner as in Example 1, except that the amount of titanium tetrachloride in step 4) was adjusted from 2.3 milliliters to 1.0 milliliters.

[0080] The results of average particle diameter and particle size distribution measurement show that the average particle diameter (D 50 ) was 27 μm, and the particle size distribution width (Span) was 0.7. The catalyst activity and the sieving results of the polypropylene powder are shown in Table 1 below.

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Abstract

The invention provides a main catalyst component for alkene polymerization and a catalyst. The main catalyst component is prepared from a magnesium compound, an oxygen-containing titanium compound, a chlorine-containing compound, an acyl chloride compound and a titanium tetrahalide, and has the advantages of good particle morphology, and uniform particle size distribution. The catalyst of the invention is mainly prepared from the main catalyst component, an organic aluminum compound, an organic silane compound, has the characteristics of high catalytic activity, uniform particle morphology, and narrow particle size distribution, and is suitable for olefin polymerization, especially propylene gas phase polymerization and bulk polymerization processes. Because titanium tetrachloride amount in the catalyst preparation is reduced, the preparation cost of the catalyst is significantly reduced. And when the catalyst of the invention is employed, the size distribution of a polymer product is narrowed and the over thick or over thin polymer product decreases due to the copy effect of the particle morphology.

Description

technical field [0001] The present invention relates to procatalyst components and catalysts for olefin polymerization. In particular, the present invention relates to procatalyst components for the polymerization or copolymerization of propylene, and catalysts formed from the procatalyst components. technical background [0002] The Ziegler-Natta catalyst system plays a dominant role in the industrial production of olefin polymerization, especially polypropylene, and its theoretical research focuses on the polymerization activity of the catalyst, the particle shape and particle size distribution of the catalyst, the stereospecificity and copolymerization performance of the catalyst, etc. . In the actual production of polypropylene, the most concerned issue is how to improve the particle shape and particle size distribution of the produced polypropylene powder. If the particle shape of the produced polypropylene powder is spherical, the particle size distribution is narrow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/06C08F4/649C08F4/646C08F4/658C08F4/651C08F4/653C08F4/654
Inventor 高克京义建军谭魁龙毛静王永刚袁苑王科峰崔伟松
Owner PETROCHINA CO LTD
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