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Olefin polymerization method

An olefin polymerization and olefin technology, applied in the field of olefin polymerization, can solve problems such as low efficiency and low catalytic efficiency, and achieve the effects of good mechanical strength, reduced production cost, high polymerization efficiency or catalytic efficiency

Active Publication Date: 2013-07-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to overcome the catalytic efficiency of the supported metallocene catalyst in the prior art is still low, resulting in the low efficiency of the olefin polymerization reaction using the supported metallocene catalyst, to provide a high-efficiency olefin polymerization method

Method used

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Examples

Experimental program
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Effect test

Embodiment approach

[0058] According to a preferred embodiment of the present invention, the preparation method of the supported metallocene catalyst comprises:

[0059] In the first step, the triblock copolymer polyethylene glycol-polyglycerol-polyethylene glycol and ethanol are added to the buffer solution of acetic acid and sodium acetate with a pH value of 1-6, at a temperature of 10-60°C Stir until dissolved;

[0060] In the second step, trimethylpentane is added to the solution obtained in the previous step, and stirred at a temperature of 10-60° C. for 1-20 hours;

[0061] Step 3, add tetramethoxysilane to the solution obtained in the previous step, and stir at a temperature of 10-60°C for 10-72 hours;

[0062] In step 4, the solution obtained in the previous step is placed in a closed reaction vessel, and crystallized at a temperature of 30-150° C. for 10-72 hours;

[0063] Step 5, filtering, washing and drying the crystallized product to obtain the hollow spherical mesoporous material ...

preparation example 1

[0080] This preparation example is used to prepare the supported metallocene catalyst used in the olefin polymerization method according to the present invention.

[0081] 1.0 gram of three-stage copolymer polyethylene glycol-polyglycerol-polyethylene glycol (purchased from Aldrich, brand P123) and 1.69 gram of ethanol are added in the buffer solution of acetic acid and sodium acetate of pH=4.4 of 28ml, Stir at 15°C until polyethylene glycol-polyglycerol-polyethylene glycol is completely dissolved, then add 6g of trimethylpentane to the above solution, stir at 15°C for 8 hours, then add 2.13 grams of tetramethylpentane Add oxysilane to the above solution, stir at 15°C for 20 hours, transfer the solution to a polytetrafluoroethylene-lined reactor, crystallize at 60°C for 24 hours, filter, wash with distilled water, and dry to obtain a hollow Spherical mesoporous silica raw powder.

[0082] The hollow spherical mesoporous silica raw powder was calcined in a muffle furnace at 55...

Embodiment 1

[0096] This example serves to illustrate the olefin polymerization process according to the present invention.

[0097] In a 2-liter stainless steel autoclave, replace three times each with nitrogen and ethylene, then add 200 ml of hexane, raise the temperature of the kettle to 80 ° C, then add 800 ml of hexane, and add 2 ml of hexane with the addition of hexane The concentration is 1 mol / liter triethylaluminum (TEA) hexane solution, then add 85.5 mg MAO / MS-GJ-BU-1, feed ethylene, raise the pressure to 1.0MPa and maintain it at 1.0MPa, in React at 70°C for 1 hour. Obtain 412 grams of polyethylene particle powder, the bulk density (BD) of this polyethylene particle powder is 0.323g / ml, melt index MI 2.16 = 0.005 g / 10 min. It was determined by calculation that the efficiency of the catalyst was 4819g PE / gcat h (ie, 2×10 8 g PE / (mol Zr h)).

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Abstract

The invention provides an olefin polymerization method. The method comprises the step of: contacting one or more olefins with a loaded metallocene catalyst under an olefin polymerization condition, and is characterized in that: the loaded metallocene catalyst comprises a carrier, and a metallocene compound and alkylaluminoxane loaded on the carrier; and the carrier is a compound of hollow sphere mesoporous silicon dioxide and silica gel. In the olefin polymerization method provided by the invention, the metallocene compound in the catalyst in use has a sandwich structure, cyclopentadienyl is provided with a substituent, and the compound of the hollow sphere mesoporous silicon dioxide and the silica gel has a highly-ordered large pore diameter (3-20 nanometers), a large pore size, high mechanical strength and high macromolecular adsorption performance, so that high polymerization efficiency is achieved.

Description

technical field [0001] The present invention relates to a method for polymerizing olefins. Background technique [0002] The development and application of metallocene catalysts is another major breakthrough in the field of olefin polymerization catalysts after the traditional Ziegler-Natta catalysts. Due to the large amount of methylaluminoxane (MAO) required to achieve high activity of homogeneous metallocene catalysts, the production cost is high, and the obtained polymer has no particle shape, it cannot be used in the widely used slurry method or gas phase polymerization process. use. Moreover, the activity of the metallocene catalyst is very high, and it is prone to localized polymerization at a faster rate during the polymerization reaction, which in turn leads to detonation. [0003] An effective way to solve the above problems is to carry out loading treatment on soluble metallocene catalysts. At present, there are many reports on the supported metallocene catalys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F4/6592C08F4/02C08F10/02
Inventor 邱波亢宇郑刚谢伦嘉王洪涛郭顺王彦强刘长城
Owner CHINA PETROLEUM & CHEM CORP
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