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Catalyst component 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 high polymer fine powder content and small catalyst particle size

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 component for ethylene polymerization and catalyst thereof
  • Catalyst component 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. , reacted for two hours, added 1.5 grams of titanium trichloride and 1.4 grams of phthalic anhydride, continued the reaction for one hour, cooled to -28°C, added 56 ml of titanium tetrachloride dropwise, gradually raised the temperature to 85°C, and kept the temperature for one After several hours, the mother liquor was filtered off, washed several times with inert diluent toluene and organic solvent hexane, and then dried to obtain magnesium / titanium-containing solid a.

[0045] Add 6 grams of magnesium / titanium-containing solid a to another reaction kettle, add 120ml of hexane, and add 3.5ml of SiCl dropwise at a stirring speed of 320rpm and a temperature of 20°C 4 , under the condition of stirring...

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, inject 2 ml of triethylaluminum-hexane solution with a concentration of 1 mmol / ml with a syringe, and then Add 50 mg of catalyst solids component b, and make up about 1 liter of hexane in total.

[0051] After the feeding is completed, the temperature is raised and hydrogen and ethylene are introduced successively, 6.8×10 5 Pa Hydrogen, 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. 8.5 g of a particulate catalyst component c containing 4.2% 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 for ethylene polymerization. The catalyst comprises: A. a titanium-containing solid catalyst component, which is obtained by: dissolving magnesium halide in an organic epoxy compound and an organic phosphorus compound, then adding an electron donor compound to form a uniform solution, in the presence of an assistant precipitation agent, mixing the solution with a halide of titanium or its derivative, and conducting washing and drying to obtain a solid a; reacting a silicon compound with the solid a in an inert solvent, and performing washing and drying; and B. an organic aluminum compound with a general formula of AlRnX3-n, wherein n is alkyl with a hydrogen or carbon atom number of 1-20, X is an halogen atom, and n is an integer larger than 0 and smaller than or equal to 3. The catalyst component can have high catalyst activity and high hydrogen regulation sensitivity when it is applied to ethylene polymerization, and the obtained polymer can have a low fine powder content. The catalyst is suitable for slurry polymerization or gaseous polymerization of ethylene, and is especially suitable for an ethylene gaseous fluidized bed polymerization process with the catalyst fed in a slurry form.

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): C08F10/02C08F4/649C08F4/646C08F4/658
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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