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Catalyst composition for gaseous polymerization or copolymerization of ethene and preparaing method thereof

A copolymerization catalyst and gas-phase polymerization technology, applied in the field of ethylene polymerization catalysts, can solve the problems of low bulk density, unstable polymerization activity, and unstable reaction of polymerization products, and achieve the effects of protecting activity, improving bulk density, and stable polymerization reaction.

Inactive Publication Date: 2004-03-31
ZIBO XINSU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of ethylene gas phase polymerization or copolymerization catalyst composition, belong to the field of ethylene polymerization catalyst, especially relate to a kind of ethylene gas phase polymerization or copolymerization catalyst composition with silica as carrier, it is also a kind of novel gas phase A high-performance catalyst for the production of low-density polyethylene by French ethylene polymerization, which solves the problems of unstable reaction, unstable polymerization activity, low bulk density and poor quality of polymerization products in the current ethylene gas phase polymerization process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 This experiment was carried out on a gas-phase polyethylene pilot plant, which has a 5kg / batch catalyst preparation system and a 25kg / hour polyethylene reactor.

[0021] A. Treatment of Silica Support

[0022] The selected silica carrier is an average particle diameter of 20 microns, a pore volume of 1.65ml / g, and a specific surface of 420m 2 / g of silica. Weigh 2.0Kg of silicon dioxide and place it in an activated bed activation furnace, feed in nitrogen to fluidize, heat up to 650°C, keep the temperature constant for 6 hours, and gradually cool to room temperature to obtain a silicon dioxide carrier with good fluidity. Transfer to the catalyst preparation tank, add 20 liters of anhydrous and oxygen-free isopentane and stir for 3 hours, then slowly add 0.60 Kg of pure triethylaluminum to treat the surface.

[0023] B. Catalyst Preparation

[0024] (1) Under nitrogen protection, add tetrahydrofuran 20L, about 35.6Kg, into a 100-liter preparation tank with a...

Embodiment 2

[0030] Embodiment 2: prepare the second batch of catalyst with the method for embodiment 1, preparation method is as follows:

[0031] A. Treatment of Silica Support

[0032] The selected silica carrier is an average particle size of 10 microns, a pore volume of 1.50ml / g, and a specific surface of 280m 2 / g of silica. Weigh 2.0Kg of silicon dioxide and place it in an activated bed activation furnace, feed in nitrogen to fluidize, heat up to 200°C, keep the temperature constant for 4 hours, then gradually cool to room temperature, transfer the silicon dioxide carrier to the catalyst preparation tank, add 16 liters Stir with anhydrous and oxygen-free n-pentane, and then slowly add 0.45Kg of pure triethylmagnesium to treat the surface.

[0033] B. Catalyst Preparation

[0034] (1) Under nitrogen protection, add tetrahydrofuran 8.43L, about 15.0Kg, in a 100-liter preparation tank with agitator, cooler and heating device, start the agitator, then add titanium trichloride 0.08Kg ...

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PUM

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Abstract

A composition of ethylene gas polymerization and polymerized catalysts and its preparation method. It is composed by catalyst carrier, main catalyst, and co-catalyst, which is characterized in, active silicon dioxide as the carrier, the main catalyst containing at least a titanium compound, a slurry catalyst with dehydrated mineral oil as the disperser, aluminum alkyl as the co-catalyst. The method comprises: supporting mixed solution of TiCl3,MgCl2 and THF on the active silicon dioxide carrier, after prereducing, the mixed solution mixing with dehydrated mineral oil and forming slurry catalyst main body, which consists of the catalyst system with aluminum alkyl. The catalyst system is suitable for ethylene gas polymerization and co polymerization, especially for high-performance catalystfor producing low-density polyethylene by gas polymerization.

Description

technical field [0001] The invention belongs to the technical field of ethylene polymerization catalysts, in particular to a carrier type slurry liquid catalyst containing titanium compound and alkyl aluminum compound. Background technique [0002] At present, the application and development of high-efficiency polyethylene catalysts focus on chromium-based high-efficiency catalysts, Ziegler-Natta (Ziegler-Natta) catalysts and metallocene catalysts, and the linear low-density catalysts produced by Ziegler-Natta catalysts Polyethylene film resins have good processability and mechanical properties. The catalysts used in the production of low-density polyethylene products by the gas phase polyethylene process are basically titanium / magnesium system Ziegler-Natta catalysts, such as M -1 Catalyst. Ziegler-Natta catalysts usually have three forms: soluble, colloid and heterogeneous. Supported catalyst is a heterogeneous catalyst, which can improve the reactivity and other propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/34C08F4/642C08F10/02
Inventor 王洪涛韩言青王恒元孔军
Owner ZIBO XINSU CHEM
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