A kind of polyolefin catalyst and its preparation method and application

A polyolefin catalyst and catalyst technology, applied in the field of polyolefin, can solve the problems of complex operation, high difficulty, poor repeatability, etc., and achieve the effect of excellent polymerization performance and guaranteed stability

Active Publication Date: 2019-05-24
LIAONING DINGJIDE PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst obtained by mixing in the first method is obtained by mixing two different catalysts, and the difference in activity leads to instability in the polymerization process. The same catalyst production line produces catalysts with different performances in batches, and the operation is more complicated.
Moreover, since various factors in the catalyst preparation process will affect the performance of the catalyst, the repeatability is poor.
The second method is to control the particle size distribution of the catalyst by controlling the particle size distribution of the carrier. This method is more difficult, and the bulk density of the prepared catalyst is generally high, which leads to an increase in the bulk density of the polymer particles, which is not conducive to gas phase Fluidized state formation of the reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In an anhydrous and oxygen-free 250mL flask, sequentially add anhydrous MgCl 2 (0.025mol) and Mg(EtO) 2 (0.025mol) were added to 30mL of n-decane, stirred and added dropwise with 2-ethyl-hexanol, and reacted at a constant temperature of 130°C for 2 hours to form a transparent and uniform solution, then added tetrabutyl titanate (0.005 mol) and Diisobutyl phthalate (0.01 mol) was reacted at a constant temperature of 130°C for 1 hour to obtain an alcoholate, which was cooled for later use. Purge the 600mL catalyst reactor with nitrogen, add 250mL titanium tetrachloride and cool down to -20°C, slowly add the above-mentioned alcoholate into titanium tetrachloride, and stir at -20°C after the addition is completed 1 hour, then heated up to 110°C within 4 hours, reacted at a constant temperature of 110°C for 2 hours, added 250mL titanium tetrachloride again after filtering, continued to react at 110°C for 2 hours, filtered and washed twice at 80°C with toluene, Wash with he...

Embodiment 2

[0037] Preparation and polymerization method substantially the same as Example 1, the difference is that in the catalyst preparation process, the addition of magnesium chloride and ethoxymagnesium is changed to 0.01mol and 0.04mol, after testing, the diameter of the catalyst is 1.3, and the titanium content is 2.5%, and the ester content is 8.4%. The polymerization result showed that the polymerization activity was 30.01kg / gCat., and the isotacticity was 97.8%.

Embodiment 3

[0039] Substantially the same preparation and polymerization method as in Example 1, the difference is that in the catalyst preparation process, the addition of magnesium chloride and ethoxymagnesium is changed to 0.04mol and 0.01mol. After testing, the diameter of the catalyst is 0.8, and the titanium content is 2.6%, and the ester content is 8.3%. The polymerization result showed that the polymerization activity was 29.6kg / gCat., and the isotacticity was 97.9%.

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PUM

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Abstract

A polyolefin catalyst and a preparation method and application thereof are disclosed. The preparation method of the catalyst comprises the following steps: adding magnesium chloride and alkyloxy magnesium into an organic solvent containing an organic alcohol compound to form a transparent uniform solution, and stirring at constant temperature and reacting; adding an ether and / or ester compound and an alkyloxy titanium compound into the transparent uniform solution obtained in the step (a) and stirring at constant temperature and reacting; slowly dropwise adding the uniform solution obtained in the step (b) into titanium halide, stirring at constant temperature, and carrying out a thermostatic reaction; filtering the product obtained in the step (c) and washing with a solvent, adding the washed product into the same amount of fresh titanium halide and carrying out a thermostatic reaction; and filtering the product obtained in the step (d), washing to remove redundant titanium halide, and drying to obtain the catalyst. When the catalyst is used in a gas fluidized bed reaction, fluidized state in a reaction vessel can be greatly maintained and stability of the reaction process is guaranteed.

Description

technical field [0001] The invention relates to a polyolefin catalyst, in particular to a wide and adjustable polyolefin catalyst with a wide particle diameter and a preparation method and application thereof, which are applicable to gas-phase polymerization conditions and belong to the field of polyolefins. Background technique [0002] Under the gas-phase polymerization conditions of polypropylene, the size and size difference of polymer particles have a great influence on the fluidized state stability of the polymerization tank. Generally, the catalyst with a wide particle size distribution can obtain a wide particle size distribution of polymer particles. It is conducive to the evacuation of heat in the bed, not easy to agglomerate, and the fluidized state is relatively stable. [0003] Generally, the particle diameter of Ziegler-Natta catalysts is generally 0.5 to 0.8. At present, there are two main methods to improve the particle size distribution of catalysts. One is ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08F4/645C08F4/02C08F4/649C08F110/06
Inventor辛伟荣佟秀永赵金豹
OwnerLIAONING DINGJIDE PETROCHEM