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Catalyst suitable for vinyl polymerization and copolymerisation

A technology of ethylene polymerization and catalyst, which is applied in the field of catalysts for ethylene polymerization or copolymerization, and can solve the problem of low catalyst activity

Active Publication Date: 2008-10-22
ZIBO XINSU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a catalyst suitable for ethylene polymerization or copolymerization, which overcomes the defect of low activity of catalysts suitable for ethylene gas phase polymerization in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (a) Prepare the slurry to be sprayed: after passing through N 2 Add 400mL of tetrahydrofuran treated with impurity removal into the fully replaced stirred 500mL reactor, add 16g of anhydrous magnesium chloride while stirring, stir for ten minutes, then add 3.7ml of titanium tetrachloride, and raise the temperature of the reaction system to 68°C. And react at this temperature for 2 hours at a constant temperature to obtain a uniform titanium tetrachloride-magnesium chloride-tetrahydrofuran solution. Within half an hour, the temperature of the system is gradually reduced to 35° C., and trichloroethanol (Cl 3 CCH 2 OH) 9.2ml, and react at a constant temperature of 35°C for 1 hour, add 25 grams of fumed silica gel (Cabot TS-610), and react at a constant temperature of 35°C for 2 hours to prepare the slurry to be sprayed;

[0022] (b) Preparation of catalyst precursor by spray drying: This experiment was carried out by a laboratory small-scale pneumatic fluid spray dryer (B...

Embodiment 2

[0026] (a) Prepare the slurry to be sprayed: except that adding 3.7ml titanium tetrachloride is replaced by adding 6.6g titanium trichloride (AA grade), other is the same as embodiment 1;

[0027] (b) Preparation of catalyst precursor by spray drying: This experiment was carried out by a laboratory small-scale pneumatic fluid spray dryer (Buchi B-290spray-drier). Introduce nitrogen with an inlet temperature of 135°C into the spray dryer with an air flow of 0.12m 3 / min, add the slurry to be sprayed at about 35°C into the spray dryer at a rate of 8ml / min, or at a rate that stabilizes the outlet temperature of the spray dryer at 88±2°C. The spherical catalyst precursor is collected at the lower outlet of the cyclone separator;

[0028] (c) ethylene slurry polymerization: with embodiment 1;

[0029] (d) Ethylene gas phase polymerization: with embodiment 1.

Embodiment 3

[0031] (a) Prepare the slurry to be sprayed: except that adding trichloroethanol 9.2ml is replaced by adding trichloroethanol 4.6ml, other is the same as embodiment 1;

[0032] (b) spray drying preparation catalyst precursor: with embodiment 1

[0033] (c) ethylene slurry polymerization: with embodiment 1;

[0034] (d) Ethylene gas phase polymerization: with embodiment 1.

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Abstract

The invention provides a catalyst for the vinyl polymerization or the copolymerization, consisting of an alkyl aluminium compound and a catalyst precursor, wherein, the alkyl aluminium compound is the alkyl aluminium compound of AIRm'X(3-m), wherein, R' is the same or different alkyls of C1 to C8, m is equal to 1, 2 or 3, X is chlorine, the catalyst precursor comprises a titanium compound, magnesium halide, electron donors without active hydrogen and an inertia inorganic filler. The catalyst is characterized in that a halogenated compound improver is added into the catalyst precursor and is preferable to be Cl3CCH2OH, Cl2CHCH2OH, ClCH2H2OH, Cl3CC(CH3)2(OH), Cl3CCOCl, Cl2CHCOCl and ClCH2COCl. The catalyst is suitable for the ethylene homopolymerization or the copolymerization of ethylene and alpha- olefin and overcomes the shortcomings of the prior art that the ethylene gas-phase polymerization catalyst has low activity.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a catalyst suitable for ethylene polymerization or copolymerization. Background technique [0002] As we all know, the ethylene gas phase polymerization process has more and more market shares in the ethylene polymerization process due to its advantages of low investment, low operating costs, and less environmental pollution. There are two requirements for the gas phase polymerization process on the catalyst: high polymerization activity to ensure the quality of resin products; suitable particle shape and particle size, free flow, easy fluidization, and the generated polymer has good particle shape , no flakes or lumps. Chinese patent application 93117628 discloses a Ziegler-Natta type catalyst system suitable for the production of ethylene copolymers with reduced hexane extractables by reducing tetrachloromethane with magnesium powder in tetrahydrofuran Titanium oxide generates active...

Claims

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Application Information

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IPC IPC(8): C08F4/649C08F10/02
Inventor 张志传李德宏苏光宗德斌刘洋赵晓燕衣斌
Owner ZIBO XINSU CHEM
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