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Catalyst components, catalyst systems and prepolymerized catalysts for the polymerization of olefins and their use, and processes for the polymerization of olefins

An olefin polymerization and catalyst technology, applied in the field of olefin polymerization, can solve the problems of low polymer bulk density, large catalyst particle size, low polymer melt index, etc., and achieve broad application prospects, good stereoregularity, and uniform particle size distribution. Effect

Active Publication Date: 2021-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of these compounds tends to be limited due to safety and health concerns, such as possible effects on fertility
There are literatures disclosing the use of other ester compounds as precipitation aids, such as preparing catalysts with cyclohexanedicarboxylate compounds as precipitation aids. The catalyst particle size prepared by this method is large, and it is easily broken during the polymerization process, and the obtained polymerization The melt index of the material is low, and the bulk density of the polymer is also low, which is not conducive to packaging and transportation
CN101864009A discloses the preparation of catalysts with diol ester compounds as precipitation aids. During the preparation of catalysts by this method, the catalyst particles are not easy to settle, and the final catalyst has poor fluidity and is easy to aggregate into blocks. When used for olefin polymerization, hydrogen Poor tuning sensitivity

Method used

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  • Catalyst components, catalyst systems and prepolymerized catalysts for the polymerization of olefins and their use, and processes for the polymerization of olefins
  • Catalyst components, catalyst systems and prepolymerized catalysts for the polymerization of olefins and their use, and processes for the polymerization of olefins
  • Catalyst components, catalyst systems and prepolymerized catalysts for the polymerization of olefins and their use, and processes for the polymerization of olefins

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Experimental program
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Effect test

Embodiment approach

[0025] According to one embodiment of the present invention, the catalyst component is prepared by the following method:

[0026] The organic solution containing magnesium is contacted with the compound represented by the formula (I) and the Ti-containing compound, and the solid is precipitated, treated with titanium, washed, and an internal electron donor is optionally added during the process to obtain the catalyst component.

[0027] Preferably, the organic solution containing magnesium is a homogeneous solution formed by dissolving a magnesium compound in a solvent system containing an organic epoxy compound and an organic phosphorus compound.

[0028] Specifically, the magnesium compound may be selected from magnesium dihalide, hydrate or alcoholate of magnesium dihalide, and derivatives in which one halogen atom in the molecular formula of magnesium dihalide is replaced by alkoxy or halogenated alkoxy; Preference is given to magnesium dihalides or alcoholates of magnesiu...

Embodiment 1

[0064] Into the reactor fully replaced by pure nitrogen, add 4.8g of magnesium chloride, 95mL of toluene, 4mL of epichlorohydrin, and 12.5mL of tributyl phosphate in sequence, raise the temperature to 50°C under stirring, and maintain it for 2.5h. The solid is completely dissolved, and add 4- Cyclohexene-1,2-dicarboxylic anhydride 10mmol, continue to maintain 1h. Cool the solution to below -29°C, add TiCl dropwise within 1h 4 56mL, after the dropwise addition, the temperature was raised to 80°C at a constant speed, and solids were gradually precipitated during the heating process. Add 6 mmol of 3,5-heptanediol dibenzoate to the solid, maintain the temperature for 1 h, filter, and wash twice with 70 mL of toluene to obtain a solid precipitate. Then add toluene 60mL and TiCl 4 40mL, heated up to 110°C, maintained for 2h, filtered; the same operation was repeated once. Afterwards, the precipitate was washed three times with 70 mL of toluene at 110° C. for 10 min each, and 60 m...

Embodiment 2

[0067] The preparation method of the catalyst component is the same as in Example 1, except that 4-methyl-4-cyclohexene-1,2-dicarboxylic anhydride is used instead of 4-cyclohexene-1,2-dicarboxylic anhydride.

[0068] Propylene polymerization method is with embodiment 1. The performance data are shown in Table 1.

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Abstract

The invention belongs to the field of olefin polymerization catalysts and provides a catalyst component for olefin polymerization, a catalyst system, a pre-polymerization catalyst, an application thereof and an olefin polymerization method. This catalyst component comprises the compound shown in magnesium, titanium, halogen and formula (I); R in (I) 1 , R 2 , R 3 , R 4 , R 5 and R 6 each independently selected from hydrogen and substituted or unsubstituted C 1 -C 20 straight chain alkyl, C 3 -C 20 Branched chain alkyl, C 3 -C 20 Cycloalkyl. When the catalyst system is used for propylene polymerization, its safety factor is high, the catalyst has good catalytic activity, and the catalyst has good hydrogenation sensitivity.

Description

technical field [0001] The invention belongs to the field of olefin polymerization catalysts, and in particular relates to a catalyst component, catalyst system, prepolymerization catalyst and application thereof for olefin polymerization, and an olefin polymerization method. Background technique [0002] The preparation of the magnesium chloride supported catalyst usually first activates the magnesium chloride by chemical method, and then treats the highly active magnesium chloride with a titanium compound. Chemical activation of magnesium chloride generally dissolves magnesium chloride in the solvent system first, and then uses heat treatment to remove the solvent or add a precipitation agent to re-precipitate magnesium chloride from the solution. Using techniques such as adding a precipitation agent to re-precipitate magnesium chloride from the solution often requires adding In order to obtain solids with uniform particle size, it is necessary to use precipitation aids. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F110/06C08F4/654C08F4/651C08F4/649C08F4/645
CPCC08F10/00C08F110/06C08F4/6545C08F4/651C08F4/6494C08F4/645C08F2500/15C08F2500/12
Inventor 蔡晓霞高明智刘海涛马吉星胡建军马晶王军何世雄李昌秀张志会陈建华刘文蕊
Owner CHINA PETROLEUM & CHEM CORP
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