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A kind of olefin polymerization catalyst system and its application

An olefin polymerization and catalyst technology, applied in the field of olefin polymerization, can solve problems such as difficulties, and achieve the effects of simple polymerization method, high polymerization activity, and improved hydrogen modulation sensitivity

Active Publication Date: 2019-06-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the general situation, it is difficult to effectively adjust the overall performance of the catalyst through the external electron donor or the composition of the external electron donor compound in the prior art, that is, to obtain a catalyst with superior polymerization activity and hydrogen modulation sensitivity.

Method used

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  • A kind of olefin polymerization catalyst system and its application
  • A kind of olefin polymerization catalyst system and its application
  • A kind of olefin polymerization catalyst system and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0087] According to a specific embodiment of the present invention, the specific preparation method of the magnesium halide alkoxide carrier includes: mixing anhydrous magnesium halide and a lower alcohol, heating up the reaction to generate a magnesium halide alkoxide melt, and the reaction temperature is At 90-140°C, the dispersion medium is subjected to high shear and placed in a cooled inert medium to form spherical magnesium halide alcoholate particles, which are washed and dried to obtain a spherical carrier. The high shear effect can be obtained by conventional methods, such as high-speed stirring method (such as CN1330086), spray method (such as US6020279), supergravity rotating bed (such as CN1580136A) and emulsifier method (CN1463990A). The dispersant system uses hydrocarbon inert solvents, such as kerosene, white oil, silicone oil, paraffin oil, petrolatum, etc. The cooling medium is selected from pentane, hexane, heptane, petroleum ether, raffinate and the like.

[0...

preparation example

[0101] Add 100ml of titanium tetrachloride to a 300ml glass reaction flask with stirring that has been fully replaced by high-purity nitrogen, cool to -20°C, add spherical magnesium chloride alkoxide (see Chinese Patent CN1330086A for the preparation method), and slowly raise the temperature to 110 ℃, add 2.5mol of diol ester compound and 3.9mmol of carboxylate compound during the heating process, after constant temperature at 110°C for 0.5h, filter out the liquid, add titanium tetrachloride for two treatments, and then wash with hexane five times. After vacuum drying, a titanium-containing solid catalyst component A is obtained.

Embodiment

[0103] According to the components in Examples 1-14 and Comparative Examples 1-4 in Table 1, the polymerization reaction of propylene was carried out with reference to the following conditions.

[0104] In a 5-liter autoclave, purged with a nitrogen stream at 70°C for 1 hour, and then replaced the polymerizer with gas phase propylene three times, and introduced 5 ml of alkyl aluminum compound (the concentration of triethyl aluminum is 0.5 mmol / ml), 1ml of hexane solution of the external electron donor (the concentration of the external electron donor is 0.1mmol / ml), 10ml of anhydrous hexane and 8-12mg of titanium-containing solid catalyst component A. Close the autoclave, introduce a certain volume of hydrogen (at 25°C, normal pressure) (L) and 1.0-1.2Kg of liquid propylene; quickly raise the temperature in the scalp to 70°C under stirring. After the polymerization reaction at 70°C for 1 hour, the stirring was stopped to remove the unpolymerized propylene monomer, and the polymer...

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Abstract

The invention relates to the field of olefin polymerization, and discloses a catalyst system. The catalyst system comprises a titanium containing solid catalyst component, an aluminium alkyl compound and an external electron donor compound; the titanium containing solid catalyst component comprises at least two kinds of internal electron donor compounds, which contain a diol ester type compound and a carboxylate compound; and the external electron donor compound is an ether ester compound. The invention also provides an application of the catalyst to the olefin polymerization. The solid catalyst component which comprises the diol ester type compound and the carboxylate compound as internal electron donors is used for carrying out the olefin polymerization, and the ether ester compound is used for the olefin polymerization, so that high polymerization activity of the catalyst is maintained, and at the same time hydrogen response of the catalyst is improved.

Description

Technical field [0001] The present invention relates to the field of olefin polymerization. Specifically, the present invention relates to a catalyst system and its application in olefin polymerization. Background technique [0002] As we all know, the catalyst system used in the homopolymerization or copolymerization of α-olefins is generally composed of three parts: (1) main catalyst (solid catalyst), (2) co-catalyst (usually alkyl aluminum compound) And (3) The external electron donor compound added during polymerization. [0003] The use of one or more external electron donor compounds to control the stereoregularity and morphology of the polymer during the polymerization reaction is well known to those skilled in the art. In addition to affecting the stereoregularity of the polymer, external electron donors often affect other aspects of the catalyst's performance to varying degrees. Although many kinds of compounds are known as external electron donors, the use of different ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F4/649C08F4/646C08F110/06
Inventor 张天一夏先知刘月祥张志会段瑞林万真马长友
Owner CHINA PETROLEUM & CHEM CORP
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