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Catalyst for ethylene polymerization

A technology of ethylene polymerization and catalyst, which is applied in the field of catalysts, can solve the problems of high content, lower performance of polyethylene resin products, and unsatisfactory catalyst efficiency, etc., and achieve the effect of uniform feeding, stable operation, and uniform feeding

Inactive Publication Date: 2004-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst efficiency is still unsatisfactory, and when the catalyst is applied to the copolymerization of ethylene and higher α-olefins such as hexene, the resulting polymer has a high content of hexane extractables, which will reduce the polymerization rate. Vinyl final product properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of catalyst:

[0035] to pass through N 2 Add 1.3 grams of TiCl successively to the 250ml three-neck bottle that was purged 3 .1 / 3AlCl 3 , 3.0 g MgCl 2 and 75 ml of tetrahydrofuran, heated to 65° C. under stirring, and reacted at constant temperature for 2 hours. Add Si(OEt) at a ratio of Ti to alkoxy molar ratio of 1:0.16 4 , constant temperature reaction for 2 hours. Cool down to 30°C.

[0036] to a passing N 2 After adding 4.5 g of silica gel (Cabot Corporation TS-610, particle size 0.02-0.1 micron) into the blown 250 ml three-neck flask, add the cooled mother liquor and keep the temperature at 30°C. After stirring for 2 hours, the stirred mother liquor was spray-dried with a sprayer, spraying conditions: inlet temperature 150°C, outlet temperature 70°C. A solid catalyst component was obtained, wherein the Ti content was 2.34 wt%, the Mg content was 6.1 wt%, and the THF content was 33 wt%. Add mineral oil to make a mineral oil solution contain...

Embodiment 2

[0042] 1. Preparation of catalyst: In addition to adding Si(OEt) 4 The amount is except that the ratio of 1: 0.4 is 1: 0.4 by Ti and alkoxyl molar ratio, all the other are the same as embodiment 1. Wherein the content of Ti is 2.35%, the content of Mg is 6.3%, and the content of THF is 28%. Mineral oil is added to form a mineral oil solution containing 30wt% of solids. According to the content of THF, THF:Al(Et) 2 Cl:Al(C 6 h 13 ) 3 , =1:0.5:0.2 molar ratio, adding Al(Et) 2 After Cl reacted for 20 minutes, add Al(C 6 h 13 ) 3 , reacted for 2 hours.

[0043] 2. Ethylene slurry polymerization: same as Example 1. The aggregation results are shown in Table 1.

[0044] 3, gas phase polymerization: with embodiment 1. The aggregation results are shown in Table 2.

Embodiment 3

[0046] 1. Preparation of catalyst: In addition to adding Si(OEt) 4 The amount is except that the ratio of 1:0.6 is 1: 0.6 by Ti and alkoxyl molar ratio, all the other are the same as embodiment 1. Wherein the content of Ti is 2.16%, the content of Mg is 6.0%, and the content of THF is 27%. Mineral oil is added to form a mineral oil solution containing 30wt% of solids. According to the content of THF, THF:Al(Et) 2 Cl:Al(C 6 h 13 ) 3 , =1:0.5:0.2 molar ratio, adding Al(Et) 2 After Cl reacted for 20 minutes, add Al(C 6 h 13 ) 3 , reacted for 2 hours.

[0047] 2. Ethylene slurry polymerization: same as Example 1. The aggregation results are shown in Table 1.

[0048] 3, gas phase polymerization: with embodiment 1. The aggregation results are shown in Table 2.

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PUM

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Abstract

A catalyst for polymerizing ethylene features that in preparing the mother liquid of its active component, a treating agent is used and the mole ratio of alkoxy to Ti is controlled to be less than 1. As a result, the resultant catalyst component and the organoaluminium cocatalyst can be used for the copolymerizing reaction of ethylene and high-grade alpha-olefine with less resultant hexane and higher catalyst efficiency.

Description

technical field [0001] The present invention relates to a catalyst for the polymerization or copolymerization of olefins, especially ethylene, as well as the preparation method and application of the catalyst. technical background [0002] It is well known that in the polymerization of olefins, especially the polymerization of ethylene or the copolymerization of ethylene and α-olefins, catalysts based on magnesium, titanium, halogens and electron donors are mostly used. When this type of catalyst is used in a gas-phase fluidized bed polymerization process, in order to ensure that the shape and particle size distribution of the catalyst particles are more suitable for the operation in a fluidized state, the above-mentioned catalyst components are usually supported on a carrier such as silica gel. For example: the catalysts disclosed in US4,302,565, US4,379,759 and CN 1064870A for gas-phase fluidized bed reactions are impregnated with matrix components prepared from titanium c...

Claims

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Application Information

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IPC IPC(8): C08F4/643C08F10/02
Inventor 阎力欣刘爱南陈伟张彤瑄宋文波于鲁强王义森徐世媛王跃云沈贻芳郭子芳夏先知纪卫民
Owner CHINA PETROLEUM & CHEM CORP
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