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Catalyst ingredient used for ethylene polymerization, and catalyst thereof

A technology of ethylene polymerization and catalyst, applied in the field of catalyst components, which can solve the problems of small catalyst particle size and high content of polymer fine powder

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of the catalyst prepared by this process is generally small, and the fine powder content in the polymer obtained by using this catalyst is relatively high. This catalyst is not suitable for use in the gas phase fluidized bed polymerization process.

Method used

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  • Catalyst ingredient used for ethylene polymerization, and catalyst thereof
  • Catalyst ingredient used for ethylene polymerization, and catalyst thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Preparation of catalyst components

[0044] Under the protection of nitrogen, 4.8 grams of magnesium chloride, 90 milliliters of toluene, 4.0 milliliters of epichlorohydrin, 12.5 milliliters of tributyl phosphate, and 0.5 ml of ethanol were added to the reaction kettle, and at a stirring speed of 450 rpm and a temperature of 60 ° C, After reacting for two hours, add 3.5ml of silicon tetrachloride and 1.4g of phthalic anhydride, continue the reaction for one hour, cool down to -28°C, add 56ml of titanium tetrachloride dropwise, gradually raise the temperature to 85°C, and keep the temperature constant for one hour. The mother liquor was filtered off, washed several times with inert diluent toluene and organic solvent hexane, and then dried to obtain 6.8 g of catalyst components, which contained 3.5% Ti by weight.

[0045] 2. Polymerization

[0046] A stainless steel reaction kettle with a volume of 2 liters, after being fully replaced by hydrogen, pressurize about 0....

Embodiment 2

[0049] Catalyst preparation method is the same as embodiment 1.

[0050] Polymerization evaluation conditions: a stainless steel reaction kettle with a volume of 2 liters, after being fully replaced by hydrogen, inject about 0.5 liters of hexane with nitrogen pressure, inject 2 ml of triethylaluminum-hexane solution with a concentration of 1 mmol / ml with a syringe, and then 50 mg of the catalyst component was added, and the total amount of make-up hexane was about 1 liter.

[0051] After the feeding is completed, the temperature is raised and hydrogen and ethylene are introduced successively, 6.8×10 5 H 2 , 3.5×10 5 Pa ethylene, the polymerization temperature is 85°C, react for two hours, lower the temperature, drain the residual pressure in the kettle, release the polymer slurry material, filter off the hexane, dry the polymer to obtain polyethylene powder, the results are shown in Table 1.

Embodiment 3

[0053] Catalyst preparation method is with embodiment 1, SiCl 4 The dosage was changed to 1.5ml. 6.5 g of a particulate catalyst component containing 3.2% by weight of Ti was obtained.

[0054] Polymerization evaluation conditions are the same as in Example 1, and the results are shown in Table 1.

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Abstract

The invention relates to a catalyst used for ethylene polymerization. The catalyst comprises following ingredients, A, a titanium-containing solid catalyst ingredient, and B, an organic aluminium compound. The titanium-containing solid catalyst ingredient is prepared by following steps: magnesium halide is dissolved in an organic epoxy compound and an organic phosphorous compound; an electron donor compound is added so as to obtain a uniform solution; a silica compound and a precipitation accessory ingredient are added; and an obtained mixture is mixed with a halide or a derivative of titanium so as to obtain the titanium-containing solid catalyst ingredient; general formula of the organic aluminium compound is AlRX<3-n>, wherein R is used for representing alkyl with 1 to 20 hydrogen or carbon atoms, X is used for representing halogen atom, and n is an integer, 0

Description

technical field [0001] The present invention relates to a catalyst component for ethylene polymerization or copolymerization, a preparation method of the catalyst component and a catalyst thereof. More specifically, it relates to a catalyst component in which a silicon compound is added during the preparation process, a method for preparing the catalyst component, and a catalyst thereof. Background technique [0002] In the polymerization of olefins, especially in the polymerization of ethylene or the copolymerization of ethylene and α-olefins, catalyst components based on magnesium, titanium, halogen 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 fluidized state operation, the above-mentioned catalyst components are usually supported on a carrier such as silica gel. For example, the ca...

Claims

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Application Information

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IPC IPC(8): C08F10/02C08F4/649C08F4/646C08F4/658C08F4/651
Inventor 寇鹏周俊领马永华杨岭李秉毅黄庭
Owner CHINA PETROLEUM & CHEM CORP
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