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Method for preparing high-activity high-efficiency polyethylene catalyst

A polyethylene and catalyst technology, which is applied in the field of preparation of high-activity and high-efficiency polyethylene catalysts, can solve the problems that restrict the development and production of high-value-added special brand products, narrow the adjustment range of polymer density and molecular weight, and the product color is not good. The effect of small size, increased specific surface area, and extended service life

Inactive Publication Date: 2010-03-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the catalyst belongs to the initial industrialization level of supported catalysts, compared with the catalysts currently used in domestic devices, the disadvantages are: (1) Due to the low catalyst efficiency and high ash content in the polymer (≥200ppm), the color of the product is not good. Good; (2) The adjustment range of polymer density and molecular weight is narrow, which restricts the development and production of high value-added special brand products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] In the catalyst preparation process, the feed ratio is A, the weight percentage of the carrier content is 24.19%, and the rest is the transition metal compound titanium tetrachloride. The prepared catalyst activities are respectively 3.4×10 4 gPE / gTi and 0.36×10 4 gPE / gcat, the bulk density of the polyethylene product produced is 0.34g / cm 3 .

Embodiment 2

[0013] In the catalyst preparation process, the feed ratio is B, the weight percentage of the carrier content is 13.90%, and the rest is the transition metal compound titanium tetrachloride. The prepared catalyst activities are respectively 11.90×10 4 gPE / gTi and 0.79×10 4 gPE / gcat, the bulk density of the polyethylene product produced is 0.35g / cm 3 .

Embodiment 3

[0015] In the catalyst preparation process, the feed ratio is C, the weight percentage of the carrier content is 4.19%, and the rest is the transition metal compound titanium tetrachloride. The prepared catalyst activities are respectively 49.50×10 4 gPE / gTi and 2·56×10 4 gPE / gcat, the bulk density of the polyethylene product produced is 0.38g / cm 3 .

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Abstract

The invention relates to a method for preparing a high-activity high-efficiency polyethylene catalyst for high-density polyethylene production by a tank slurry method, which is characterized by: dispersing magnesium ethylate serving as a carrier in a C6 to C13 straight-chain paraffin serving as an organic solvent and adding titanium tetrachloride which is a transition metal compound under conditions of a temperature of 50 to 180 DEG C and a stirring speed of 10 to 1,000rpm, wherein the mixing weight ratio of the magnesium ethylate to the titanium tetrachloride of 0.1 to 99.0 percent; after thereaction finishes, performing filtration, washing and pre-activation; and improving the technical index of the activity of the catalyst to 58*10<4>gPE / gTi and 3.1*10<4>gPE / gTi. The method adopts highrotating speed to obtain a big shearing force and reduces the particle size of the prepared catalyst to 1 to 2mum.

Description

Technical field: [0001] The invention relates to a preparation method of a high-activity and high-efficiency polyethylene catalyst for producing high-density polyethylene by a kettle-type slurry method. Background technique: [0002] The catalyst currently used in the polyethylene production unit of the olefin plant of Liaoyang Petrochemical Company is the matching technology imported from the German Hoechst company in 1974 for the polyethylene production unit. Since the catalyst belongs to the initial industrialization level of supported catalysts, compared with the catalysts currently used in domestic devices, the disadvantages are: (1) Due to the low catalyst efficiency and high ash content in the polymer (≥200ppm), the color of the product is not good. Good; (2) The adjustment range of polymer density and molecular weight is narrow, which restricts the development and production of high value-added special brand products. Contents of the invention [0003] The purpose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/654C08F10/02
Inventor 姜明高晓玉胡学悦杨志德高静美刘黎明王展望李倩倩阎成玉
Owner PETROCHINA CO LTD
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