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Catalyst components in use for polymerizing ethylene, and catalyst

A technology of ethylene polymerization and catalyst, which is applied in the field of catalyst components and can solve problems such as unsatisfactory hydrogen adjustment sensitivity

Active Publication Date: 2007-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrogen tuning sensitivity of the catalyst systems mentioned above is not satisfactory.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Preparation of catalyst components: in the reactor fully replaced by high-purity nitrogen, add 4.0g magnesium dichloride, toluene 50ml, epichlorohydrin 4.0ml, tributyl phosphate 4.0ml, ethanol 6.4ml successively, The temperature was raised to 70° C. under stirring, and the reaction was carried out at 70° C. for 1 hour when the solid was completely dissolved to form a uniform solution. Cool down to 30°C, add 4.8ml of diethylaluminum chloride with a concentration of 2.2M dropwise, and maintain the reaction at 30°C for 1 hour. The system was cooled to -5°C, 40ml of titanium tetrachloride was slowly added dropwise, and then 3ml of tetraethoxysilane was added to react for 1 hour. Slowly heat up to 80°C and react for 2 hours. Stop stirring, let it stand, the suspension will quickly separate into layers, remove the upper clear layer, wash twice with toluene, wash four times with hexane, and blow dry with high-purity nitrogen to obtain a solid catalyst component with good ...

Embodiment 2

[0044] (1) The synthesis of catalyst is the same as in Example 1. Only the amount of ethanol was changed from 6.4ml to 5.9ml.

[0045] (2) Ethylene polymerization is with embodiment 1. The catalyst composition and polymerization results are shown in Table 1.

Embodiment 3

[0047] (1) The synthesis of catalyst is the same as in Example 2. Only the dosage of diethylaluminum chloride was changed to 3.8ml.

[0048] (2) Ethylene polymerization is with embodiment 1. The catalyst composition and polymerization results are shown in Table 1.

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Abstract

This invention relates to a method for preparing catalyst for ethylene homopolymerization or copolymerization with other alpha-olefins. The catalyst comprises at least one Mg composite, at least one Ti compound, at least one organic alcohol compound, and at least one Si compound. The general formula of the Si compound is R1xR2ySi (OR3) z, where R1 and R2 are alkyl or halogen; R3 is alkyl; x is 0-2; y is 0-2; z is 0-4; x + y + z = 4. The catalyst has such advantages as high catalytic activity, high hydrogen sensitivity and narrow particle size distribution of polymer. The catalyst is suitable for slurry polymerization of ethylene, and combined polymerization process where catalyst with high activity is needed.

Description

technical field [0001] The present invention relates to a catalyst component for ethylene polymerization or copolymerization, a method for preparing the catalyst component and a catalyst for the catalyst component. technical background [0002] As we all know, the catalyst system containing Ti / Mg composite plays a dominant role in the industrial production of polyethylene, and the core of its research is nothing more than the polymerization activity of the catalyst, the particle shape and particle size distribution of the catalyst, the hydrogen adjustment sensitivity and Copolymerization performance and so on. In the slurry polymerization process of ethylene, in addition to requiring the catalyst to have high catalytic activity, it is very important to control the particle size and particle size distribution of the produced ethylene polymer. In the process of ethylene polymerization, especially the slurry polymerization of ethylene, it is easy to produce finer polymer examp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F4/646
Inventor 陈伟郭子方周俊领王洪涛杨红旭李瑞霞王瑞平
Owner CHINA PETROLEUM & CHEM CORP
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