Catalyst used for ethylene polymerization, and application thereof

A technology of ethylene polymerization and catalyst, which is applied in the field of catalyst and can solve the problem that the catalyst is not sensitive enough to hydrogen.

Inactive Publication Date: 2015-12-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the introduction of co-solvent organic epoxy compounds and organic phosphorus compounds, the catalyst dissolution system can dissolve magnesium chloride to form a uniform and transparent solution. The obtained catalyst has a good particle shape, and the catalyst preparation process is simple. High activity and high apparent density, but the sensitivity of the catalyst to hydrogen is not good enough

Method used

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  • Catalyst used for ethylene polymerization, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Catalyst (A) component preparation: after high-purity N 2 In the fully replaced reactor, add 4.0g of anhydrous MgCl successively 2 , 50mL toluene, 2.0mL epichlorohydrin, 3.0mL tributyl phosphate, heat up to 50°C with stirring, and maintain it for 15 minutes, add 6.0mL ethanol, continue the reaction for 15 minutes, and cool the solution to -5~0°C , and then 30mL of titanium tetrachloride was dropped into the above-mentioned homogeneous solution of magnesium chloride, and then 5ml of tetraethoxy silicon was added, the temperature of the solution was raised to 80°C, and the mother liquor was removed. It was washed 4 times with hexane and dried in vacuo to obtain a solid catalyst.

[0031] Ethylene polymerization 1: A stainless steel kettle with a capacity of 2 liters was passed through H 2 After sufficient replacement, 1000 mL of hexane, the measured solid catalyst component A prepared above containing 0.5 mmol of Ti, and 1.0 mmol of triethylaluminum were added thereto. ...

Embodiment 2

[0033] The catalyst component (A) is the same as in Example 1, except that monobromocyclopentane is added in the polymerization so that the molar ratio of Ti to monobromocyclopentane is 10.

Embodiment 3

[0035] The catalyst component (A) is the same as in Example 1, except that monobromocyclopentane is added in the polymerization so that the molar ratio of Ti to monobromocyclopentane is 3.3.

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Abstract

The invention provides a supported catalyst used for ethylene polymerization, and a composition and a preparation method thereof. The catalyst is composed of a component A, a component B and a component C, wherein the component A is prepared through the following steps: dissolving magnesium halide in an organic epoxy compound, an organic phosphorus compound and an electron donor compound to form a uniform solution, slowly reacting TiCl4 with the above obtained uniform magnesium halide solution at a low temperature to precipitate catalyst crystals, and carrying out a strictly controlled heating reaction; the component B is an organic aluminum compound; and the component C is a halogenated cycloalkane compound, and the component C can be used in anyone of the following three modes: (1) the component C and the component B are mixed, and the obtained mixture is added to an ethylene polymerization reaction system; (2) the component A, the component B and the component C are respectively added in the polymerization reaction; and (3) the component C is added in the preparation process of the component A. The catalyst has high catalytic activity and improved hydrogen sensitivity in ethylene polymerization.

Description

technical field [0001] The invention relates to a catalyst for olefin polymerization, especially ethylene polymerization, as well as a preparation method and application of the catalyst. Background technique [0002] The traditional titanium-based Ziegler-Natta catalysts for olefin polymerization are mainly composed of magnesium compounds, titanium compounds, electron donors and organic aluminum. In the method of ethylene polymerization and copolymerization disclosed in Japanese Patent JP49-51378, the catalyst uses alkane compounds as solvents, and alcohol compounds and magnesium compounds are contacted and reacted. Due to the large difference in polarity between alcohols and alkane solvents, magnesium halides It cannot be completely dissolved to form a homogeneous solution, but only produces a fine-grained colloidal suspension or a swollen magnesium halide slurry, resulting in some disadvantages related to the layered crystallization characteristics of magnesium halide, suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/656C08F4/654C08F4/651C08F2/38
Inventor 孙怡菁周俊领马冬郭子芳黄廷杰王丽莎
Owner CHINA PETROLEUM & CHEM CORP
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