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Method for preparing polyolefin catalysts

A technology of polyolefin catalyst and magnesium chloride is applied in the field of improving the preparation efficiency of polyolefin catalyst, can solve the problem of slow magnesium chloride and the like, and achieve the effects of low cost of device modification, improved production efficiency, and shortened dissolution time.

Inactive Publication Date: 2019-04-05
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present inventor found through assiduous research on the basis of the prior art that providing ultrasonic vibrations of a certain frequency during the dissolution process of magnesium chloride can solve the problem of slow magnesium chloride, and the properties of the prepared catalyst do not change.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 100L of tetrahydrofuran solvent, 10Kg of magnesium chloride, and 12.5L of ethanol into a 300L reaction kettle. The stirring speed is 200rpm. After heating to 70°C, the ultrasonic generator with a power of 2kw and a frequency of 60Hz is turned on. After 0.5 hours of sampling, the magnesium chloride is completely dissolved. Then turn off the ultrasonic generator. Vacuum drying at this temperature until the ethanol content in the solid carrier does not exceed 25%. Add 150L of hexane solvent to the reaction kettle, and add 20L of titanium tetrachloride to the reaction kettle at room temperature. The addition is completed in 1 hour. Then the temperature was raised to 70°C and the reaction continued for 4h. After the reaction is completed, the temperature is lowered, the catalyst is allowed to stand for sedimentation, and then washed with 100L of hexane after suction filtration. The washing is repeated 3 times to obtain the prepared supported catalyst.

[0017] The content...

Embodiment 2

[0019] Add 150L of tetrahydrofuran solvent and 5Kg of magnesium chloride into a 300L reactor. The stirring speed is 500rpm. After the temperature is raised to 70℃, the ultrasonic generator with power of 2kw and frequency of 100Hz is turned on. After sampling 4 hours later, the magnesium chloride is completely dissolved and then the ultrasonic generation is turned off. Device. The magnesium chloride is made into a powder carrier with an average particle size of 16 micron through a spray dryer, and the mass content of tetrahydrofuran in the carrier is 28%. The formed carrier was transferred to a 300L reactor, then 150L of hexane solvent was added, 20L of titanium tetrachloride was added dropwise to the reactor at room temperature, and the addition was completed in 1h. Then the temperature was raised to 70°C and the reaction continued for 4h. After the reaction is completed, the temperature is lowered, the catalyst is allowed to stand for sedimentation, and then washed with 100L ...

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Abstract

The invention relates to a method for preparing polyolefin catalysts. The method includes dispersing magnesium chloride in straight-chain paraffin of organic solvents C6-C13; adding titanium tetrachloride under stirring conditions at the temperatures of 50-180 DEG C, carrying out reaction and compounding magnesium ethylate and the titanium tetrachloride according to a weight ratio of 0.1-99.0%; carrying out filtering and washing after the reaction is completely carried out. The magnesium chloride is used as a carrier. The titanium tetrachloride is a transition metal compound. The method has the advantages of simple and feasible processes, high implementation ability and the like.

Description

Technical field [0001] The invention relates to a method for improving the preparation efficiency of a polyolefin catalyst. Background technique [0002] Most polyolefin catalysts use magnesium chloride or magnesium chloride-porous support composites as supports. In order to obtain an amorphous carrier with a larger specific surface area, the catalyst preparation process using magnesium chloride as a raw material usually involves the process of dissolving magnesium chloride and then precipitation. It takes a long time to completely dissolve magnesium chloride due to the trace moisture contained in magnesium chloride and metal sodium and other highly crystalline compounds, which affects the production efficiency of the catalyst. Therefore, it is necessary to develop a new catalyst manufacturing technology that can improve the preparation efficiency of polyolefin catalysts. Summary of the invention [0003] The purpose of the present invention is to solve the shortcomings of the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F4/02C08F4/16C08F4/64C08F10/02
CPCC08F10/00C08F10/02C08F4/022C08F4/16C08F4/64
Inventor 任鸿平汪开秀汪文睿李传峰谢军郭峰
Owner SINOPEC YANGZI PETROCHEM
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