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Catalyst in use for polymerization or combined polymerization of ethylene, preparation and application

An ethylene polymerization and catalyst technology, applied in the field of catalysts for ethylene polymerization or copolymerization, can solve problems such as low content of active components, influence on polymerization activity, and easy breakage of catalysts.

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

During the spray drying process, the inlet and outlet temperature of the spray dryer is relatively high, resulting in the obtained spherical MgCl 2 Carrier alcohol content is low, only 12% ~ 25% wt, spherical MgCl 2 If the alcohol content on the surface of the particles is too small, the active components cannot effectively interact with the carrier and be combined on the surface of the carrier during the subsequent loading process, so that the content of the active components in the catalyst is low and the final catalytic polymerization activity is affected
MgCl prepared by simultaneous spray drying method (conventional spray method) 2 Particle-supported catalysts are fragile

Method used

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  • Catalyst in use for polymerization or combined polymerization of ethylene, preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0043] a) preparation of magnesium chloride mother liquor for spraying: after passing through N 2Add 600ml of dehydrated ethanol to the fully replaced stirred 1000ml reactor, and add 51g of anhydrous magnesium chloride while stirring at room temperature, control the adding speed of magnesium chloride, and keep the system temperature below 40°C. , the temperature of the mixed system was raised to 70°C, and kept at this temperature for 4 hours to obtain a uniform MgCl 2 ethanol solution. Add 25.5g of smoky silica gel into the above solution under the condition of rapid stirring, continue to maintain the original temperature and stir rapidly for more than 1.5 hours, and obtain the mother liquor for spraying for later use.

[0044] b) Preparation of MgCl by spray drying 2 / SiO 2 Composite carrier: use a peristaltic pump to introduce the mother liquor obtained in step a) into a two-fluid nozzle through a pipeline, and atomize it into the drying chamber. Control feed liquid and ...

Embodiment 2

[0046] (1) Preparation of catalyst solid components

[0047] With a stirrer, through N 2 Add 100ml of hexane to the purified 250mL glass reactor. Under the condition of continuous stirring, the MgCl obtained in Example 1 2 / SiO 2 7g of the composite carrier was added therein, and after dispersing at room temperature for 30 minutes, 3ml of dry and purified ethanol was slowly added dropwise. After the dropwise addition, the stirring was continued for 3 hours. At room temperature, 23.4 ml of a 2.2M monochlorodiethylaluminum hexane solution was slowly added dropwise. After the dropwise addition, the temperature was raised to 35° C., and the mixture was stirred and reacted at a constant temperature of 35° C. for 2 hours. Then 13 ml of titanium tetrachloride was added dropwise, and after the addition of titanium tetrachloride was completed, the temperature was raised to 65° C. and then stirred at a constant temperature of 65° C. for 2 hours. Filter and wash four times, each wash...

Embodiment 3

[0051] (1) The synthesis of catalyst is the same as in Example 2. Only the amount of ethanol was changed from 3ml to 6ml; the amount of diethylaluminum hexane solution was changed from 23.4mL to 34ml.

[0052] (2) Ethylene polymerization is the same as embodiment 2.

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Abstract

This invention provides a catalyst for ethylene polymerization or copolymerization and its synthesis. The catalyst comprises magnesium halide / inorganic matter composite carrier prepared by spray drying. This invention also provides the method for preparing the magnesium halide / inorganic matter composite carrier and the method for synthesizing the catalyst by using the composite carrier. The obtained catalyst has such advantages as high catalytic activity, no breakage of catalyst particles, and narrow particle size distribution. The polymer has such advantages as good particle morphology, little fine powder and high packing density.

Description

technical field [0001] The invention relates to a catalyst for olefin polymerization, especially ethylene polymerization or copolymerization, its preparation method and application. Background technique [0002] It is well known that the high-efficiency Ziegler-Natta catalyst for olefin polymerization consists of two parts: the main catalyst and the co-catalyst. The main catalyst is composed of a transition metal compound located in the fourth to eighth main groups of the periodic table, and the co-catalyst is a metal organic compound located in the first to third main groups of the periodic table. Usually, the main catalyst can be divided into two parts: an inert carrier and its supported active component. The shape and particle size distribution of the carrier not only have an extremely important impact on the activity of the subsequent catalyst, but also determine the shape and particle size distribution of the final polymer product due to the "replication" effect in the...

Claims

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Application Information

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IPC IPC(8): C08F10/02C08F4/645C08F4/654
Inventor 陈伟王如恩赵峰王洪涛周俊领高克京郭子芳程晓静
Owner CHINA PETROLEUM & CHEM CORP
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