Prepolymerization catalyst for olefin polymerization and preparation method thereof

A technology of olefin polymerization and prepolymerization, which is applied in the field of olefin polymerization and can solve problems such as poor fluidity of catalyst prepolymers

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in previous inventions, since the mild prepolymerization conditions could not be maintained, the slurry concentration of the catalyst before prepolymerization was generally within the range of 0.005g to 2g/100ml. Increasing the slurry conc

Method used

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  • Prepolymerization catalyst for olefin polymerization and preparation method thereof
  • Prepolymerization catalyst for olefin polymerization and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1. Preparation of titanium-containing solid catalyst component A

[0050] Add 4.8 grams of magnesium chloride, 93 milliliters of toluene, 4.0 milliliters of epichlorohydrin, and 12.5 milliliters of tributyl phosphate into the reaction kettle, and react for two hours at a stirring speed of 450 rpm and a temperature of 55°C, and add 0.8 grams of ortho-benzene Diformic anhydride, continue to react for one hour, lower the temperature to -28°C, add 40 ml of titanium tetrachloride dropwise, gradually raise the temperature to 80°C, keep the temperature for one hour, filter the mother liquor, pass through the inert diluent toluene and organic solvent hexane several times After washing and drying, a magnesium / titanium-containing solid is obtained.

[0051] Add 10ml of tetrabutoxytitanium and 10ml of tetrahydrofuran into the dissolution kettle, stir evenly, then add 1g of titanium trichloride, and dissolve at a stirring speed of 450rpm to form a titanium compound solution.

[00...

Embodiment 2

[0059] 1. Preparation of titanium-containing solid catalyst component A

[0060] Add 5ml of tetrabutoxytitanium and 10ml of tetrahydrofuran into the dissolution kettle, stir evenly, then add 1g of titanium trichloride, and dissolve at a stirring speed of 450rpm to form a titanium compound solution.

[0061] In the reaction kettle, add 11 grams of magnesium / titanium-containing solids prepared in Example 1, add 100 ml of isopentane, and add dropwise 10 ml of the titanium compound solution obtained above under conditions of stirring 200 rpm and a temperature of 10° C. React at room temperature for one hour, filter the solution, and wash twice with hexane, and evaporate and dry to obtain 15.8 grams of granular titanium-containing solid catalyst component A, which contains 1.63wt% of Ti, 11.34wt% of Mg, and 0.30wt% of aluminum , THF 34.54wt%.

[0062] 2. Prepolymerization

[0063] At a temperature of 20° C., 100 ml of hexane was added to a 200 ml glass reactor with a stirrer whil...

Embodiment 3

[0067] 1. Preparation of titanium-containing solid catalyst component A

[0068] Add 3ml of tetrabutoxytitanium and 10ml of tetrahydrofuran into the dissolution kettle, stir evenly, then add 1g of titanium trichloride, and dissolve at a stirring speed of 450rpm to form a titanium compound solution.

[0069] In the reaction kettle, add 11 grams of magnesium / titanium-containing solids prepared in Example 1, add 100 ml of isopentane, and add dropwise 10 ml of the titanium compound solution obtained above under conditions of stirring 200 rpm and a temperature of 10° C. React for one hour at normal temperature, filter off the solution, and wash twice with hexane, then add 60ml of isopentane, and react for one hour with 3.5 ml of diethylaluminum chloride solution with a volume concentration of 26.43%, and obtain granular containing 14.1 g of titanium solid catalyst component A, which contains 1.83 wt% of Ti, 11.84 wt% of Mg, 0.77 wt% of aluminum and 32.28 wt% of tetrahydrofuran.

...

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Abstract

The invention provides a prepolymerization catalyst for olefin polymerization and a preparation method thereof. The prepolymerization catalyst is highly active during the polymerization. At the prepolymerization stage, beside the pressure and the hydrogen additional proportion, the prepolymerization temperature, varieties of alkylaluminium, the additional proportion of the alkylaluminium and the additional speed of a monomer are also controlled, thus the prepolymerization seriflux concentration of the catalyst can reach 10g/100ml, the particles of the prepolymerization catalyst do not agglomerate and adhere to walls. The finally generated polymerization powders do not agglomerate, the content of the fine powders is reduced obviously, the bulk density is high, and the liquidity is good.

Description

technical field [0001] The invention relates to a prepolymerization catalyst component for olefin polymerization and a preparation method, belonging to the field of olefin polymerization. technical background [0002] During the production of polymers using highly active catalysts, polymer fines and agglomerates often accompany the polymerization process. Ethylene polymerization tends to produce more polymer fines and agglomerates than propylene polymerization due to the higher initial polymerization rate compared to propylene polymerization. It is more obvious in widely used ethylene slurry polymerization and gas phase polymerization equipment. The production of fine powder will have adverse effects on the long-term operation of the process equipment, and a large amount of agglomeration will often cause blockage of the powder during the conveying and granulation process. [0003] In order to solve the above-mentioned situation in the polymerization process, the method of ...

Claims

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Application Information

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IPC IPC(8): C08F10/02C08F4/643C08F4/645C08F2/00
Inventor 杨岭寇鹏李秉毅马永华周俊领王丽莎
Owner CHINA PETROLEUM & CHEM CORP
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