Catalyst component, catalyst, preparation method and its application

A catalyst and main catalyst technology, which is applied to the supported Ziegler-Natta catalyst of Le-Natta catalyst components. In the field of catalysts, it can solve problems such as unfavorable heat transfer or control, influence, and parking.

Active Publication Date: 2008-01-30
SINOPEC YANGZI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Since the thermal activation and chemical activation process of the carrier requires special equipment, and the chemical activation of the carrier also needs to use expensive chemical activators, in addition, due to the increase of the carrier activation step, the preparation method of the catalyst will become complicated, so , which will greatly increase the manufacturing cost of such supported Ziegler-Natta catalysts
Furthermore, the kinetic curve of the loaded Ziegler-Natta catalyst prepared with this activated support is attenuating when used for ethylene polymerization, which is not conducive to heat transfer or control during industrial production.
[0016] Moreover, the presence of magnesium chloride in the Ziegler-Natta catalyst prepared by silica gel and magnesium chloride composite carrier affects the fine powder content and oligomer content in the final polymer, as well as the particle size distribution of the polymer, which is important for industrial production. Separation of polymer and solvent creates limitations, excessive fines content and oligomer content, and wide polymer particle size distribution will lead to clogging of centrifugal separation equipment and unscheduled shutdown

Method used

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  • Catalyst component, catalyst, preparation method and its application
  • Catalyst component, catalyst, preparation method and its application
  • Catalyst component, catalyst, preparation method and its application

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preparation example Construction

[0053] In a further embodiment, the present invention relates to a method for preparing a supported Ziegler-Natta catalyst component, which is a method for preparing a supported Ziegler-Natta catalyst component of the present invention, characterized in that , with the following steps:

[0054] (1) dissolving the magnesium compound in tetrahydrofuran in the presence of alcohol to prepare a uniform solution,

[0055] (2) adding water-containing silica gel to the solution to make it react,

[0056] (3) solid-liquid separation and drying of the obtained solid-liquid mixture to prepare a composite carrier, and then

[0057] (4) Adding titanium halide as the active component of the Ziegler-Natta catalyst to the composite carrier to prepare the supported Ziegler-Natta catalyst component.

[0058] Specifically, the preparation process of the supported Ziegler-Natta catalyst component is as follows:

[0059] Weigh a certain amount of magnesium compound, add tetrahydrofuran and alco...

Embodiment 1

[0116] Carrier adopts silica gel, model is ES757 (Ineos company product, average particle size 25 microns, specific surface area 300m 2 / g, average pore diameter 19.5nm, pore volume 1.6ml / g), without activation, its water content is 4.09%.

[0117] Weigh 3.4g of anhydrous magnesium chloride, add 75ml of tetrahydrofuran and 8.5ml of ethanol, stir at 60°C until the anhydrous magnesium chloride is completely dissolved, add 4.0g of the silica gel, continue stirring at 60°C for 4h, cool to 32°C, add 45ml hexane (precipitation solvent), at this moment, the slurry temperature is 25°C, then filtered, washed with 45ml×2 hexane, and vacuum-dried at 80°C to obtain a powder solid.

[0118] Weigh the above powder solid, add 50ml of titanium tetrachloride hexane solution (concentration is 5% volume ratio), stir at 60°C for 5h, then filter, wash with 45ml×2 hexane, and vacuum dry at 60°C The main catalyst (i.e. supported Ziegler-Natta catalyst component) obtained as white solid particles is...

Embodiment 1-A

[0121] Take by weighing 44mgCAT-1, add the hexane solution of 3.1ml promotor triethylaluminum (abbreviated as AT, concentration 0.88mol / L), the mol ratio of the aluminum element in the procatalyst and the titanium element in the main catalyst is 98.5, The supported Ziegler-Natta catalyst of the present invention is obtained.

[0122] Add the catalyst to a 2-liter high-pressure reactor, add 1 L of hexane, start stirring at a speed of 250 rpm, and feed hydrogen to 0.11 MPa. After the temperature rises to 85°C, continuously feed ethylene to control the total volume of the reactor. The pressure is 0.8MPa, and it is vented after 2 hours of reaction. The polymer is taken out and weighed 370g after drying, and the bulk density is 0.35g / cm 3 . Oligomer content 0.14g / L. The fine powder content is 1.77%.

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Abstract

The invention relates to supported Ziegler-Natta catalyst components based on water-bearing silica gel (water content 0.5-8.0wt percent), which comprises the supported Ziegler-Natta catalyst and catalyst components of the supported Ziegler-Natta catalyst components, and a preparation method of the catalyst. The supported Ziegler-Natta catalyst is applied to homopolymerization of catalytic olefin and copolymerization of two or more than two different olefins. The supported Ziegler-Natta catalyst of the invention has low production cost, stable and easily controllable kinetic curve when being used in homopolymerization and copolymerization of catalytic olefin and stable active release; besides, polymers produced by the invention have low contend of fine powder and oligomer of the polymer and narrow particle size distribution of the polymer.

Description

technical field [0001] The present invention relates to a supported Ziegler-Natta catalyst component based on aqueous silica gel, a supported Ziegler-Natta catalyst comprising the supported Ziegler-Natta catalyst component, the catalyst component and The preparation method of the catalyst and the application of the supported Ziegler-Natta catalyst in catalyzing the homopolymerization of olefins and the copolymerization reaction between two or more different olefins. Background technique [0002] The types of olefin polymerization catalysts used in the production of polyethylene resins by homopolymerization and copolymerization of ethylene mainly include Ziegler-Natta catalysts, single-site catalysts, or composite catalysts of the two. The single-site catalysts also include metallocene catalysts, non-metallocene catalysts and late transition metal catalysts. [0003] Ziegler-Natta type polymerization catalysts are essentially complexes of transition metal halides (such as ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/645C08F10/00
Inventor 李传峰姚小利马忠林王亚明柏基业李晓强汪开秀王兴仁赵叔章
Owner SINOPEC YANGZI PETROCHEM
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