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Vinyl polymerization catalyst, preparation and application

A technology of ethylene polymerization and catalyst, which is applied in the field of preparation of the catalyst, which can solve the problems of high polymer subdivision content and unsatisfactory shape of magnesium-containing carrier particles, etc., and achieve the effect of narrow particle size distribution and good particle shape

Active Publication Date: 2012-01-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process of the catalyst, the reaction product of magnesium halide and alkoxytitanium failed to form a solution when it reacted with alkylaluminum, the shape of the obtained magnesium-containing carrier particles was not ideal, and the prepared polymer still had a large amount of subdivision.

Method used

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  • Vinyl polymerization catalyst, preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh 10.2 g of magnesium chloride, add 78 ml of tetrabutyl titanate, stir and dissolve at 140° C. until a transparent solution is formed, lower the temperature of the solution to room temperature, and add 200 ml of dry hexane to dilute for later use.

[0033] (2) Take 20 milliliters of the solution obtained in step (1), and slowly add the solution dropwise to a mixture of 30 milliliters of hexane and 20 milliliters of silicon tetrachloride at room temperature. The reaction was stirred for 1 hour, and the reaction was stirred for 2 hours at a bath temperature of 65° C. to obtain a catalyst suspension.

[0034] (3) The temperature of the catalyst suspension is lowered to room temperature, left to stand, settled, and washed three times with hexane, each time the consumption of hexane is 50 milliliters. Purging and drying to obtain a solid fluid powder.

[0035] The average particle size of the catalyst (D(50)): 22 microns, the particle size distribution width Span: 0...

Embodiment 2

[0037] The 20 milliliters of silicon tetrachloride in the catalyst preparation step (2) was adjusted to 20 milliliters of titanium tetrachloride, and other conditions were the same as in Example 1.

[0038] The average particle size of the catalyst (D(50)): 16 microns, the particle size distribution width Span: 1.5, the activity of the catalyst and the sieving results of the polyethylene powder are shown in Table 1.

Embodiment 3

[0040] The hexane used in the catalyst preparation step of Example 1 was adjusted to the same volume of toluene, but the same volume of hexane was still used when the catalyst was washed.

[0041] The average particle size of the catalyst (D(50)): 12 microns, the particle size distribution width Span: 0.6, the activity of the catalyst and the sieving results of the polyethylene powder are shown in Table 1.

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Abstract

The invention relates to a vinyl polymerization catalyst, preparation and an application. Mg(OR<1>)nCl<2-n> shown by the formula (I) takes reaction with Ti(OR<2>)nCl<4-n> shown by the formula (II) to form transparent solution, the transparent solution takes reaction with M(OR<3>)nCl<4-n> shown by the formula (III) to form precipitations, and catalyst suspending liquid is obtained; and through being metered by the compound shown by the formula (I) in each mol, the compound shown by the formula (II) is controlled to be 0.01 to 10 mol, and the compound shown by the formula (III) is controlled tobe 0.01 to 20 mol. The vinyl polymerization catalyst has the maximal characteristics that good particle form and narrow particle size distribution are realized, and the vinyl polymerization catalyst is very suitable for ethylene slurry polymerization processes and is particularly suitable for double-reactor slurry polymerization processes.

Description

technical field [0001] The invention relates to an ethylene polymerization catalyst with good particle shape for ethylene polymerization or copolymerization, as well as a preparation method and application of the catalyst. Background technique [0002] Since the successful development of high-efficiency polyethylene catalysts in the 1970s, the world's polyethylene industry has undergone tremendous changes. Over the past 20 years, with the development of ethylene polymerization process, the catalysts matching the polymerization process have also made great progress. Among them, high-efficiency catalysts still occupy an important role in the field of polyethylene catalysts due to their excellent polymerization performance and mature application technology. In recent years, there are still a large number of patented technologies emerging. In the patented technologies of these applications, the research core is nothing more than the polymerization activity of the catalyst, the ...

Claims

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Application Information

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IPC IPC(8): C08F110/02C08F210/16C08F4/646C08F4/658C08F4/654C08F4/656C08F4/657
CPCC08F210/16C08F4/656C08F4/657C08F4/654C08F4/658C08F4/646C08F110/02C08F10/02C08F4/6565C08F4/6574C08F2/001
Inventor 高克京义建军朱百春袁苑张明革王健史君姜明姜明才胡徐腾
Owner PETROCHINA CO LTD
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