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Catalyst used for alkene polymerization reaction, preparation method and composite catalyst

A composite catalyst and olefin polymerization technology, applied in the field of olefin polymerization, can solve the problems of high polymer fine powder, broken, and increased fine powder content

Inactive Publication Date: 2020-03-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the activity of the catalyst is still not high enough, and the fine polymer powder is still relatively high.
[0007] CN100408603C discloses a catalyst for ethylene polymerization prepared by a spray drying process. The catalyst has good activity, but in the gas phase polymerization, it will still produce serious fragmentation and cause the fine powder content to rise

Method used

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  • Catalyst used for alkene polymerization reaction, preparation method and composite catalyst
  • Catalyst used for alkene polymerization reaction, preparation method and composite catalyst
  • Catalyst used for alkene polymerization reaction, preparation method and composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] (1) Preparation of catalyst

[0087] to 2.5m 3 1300L tetrahydrofuran, 7 liters of TiCl 4 , 7.0 kg TiCl 3 , 53 kg anhydrous MgCl 2 , 0.4 kg of carbon nanotubes (with a diameter of 20-50 nm and an aspect ratio exceeding 100), heated to 67° C. under stirring, and reacted at this temperature for 6 hours at a constant temperature. Cool down to 35°C, then add 82 kg of silica gel (Cabot Corporation TS-610, particle size 0.05-0.5 microns), keep the temperature at 65°C, stir for 3 hours, then cool down to 50°C, and start using a centrifugal spray dryer for the slurry Spray drying was carried out under spray conditions: inlet temperature 150° C., outlet temperature 100° C. to obtain 220 kg of solid catalyst components, wherein the titanium content was 2.19 wt%.

[0088] figure 1 It is an image obtained by using the catalyst particles obtained in Example 1, stirring and washing in ethanol, and then filtering through a 100-mesh filter screen, and observing it under a scanning ...

Embodiment 2

[0095] (1) The preparation of the catalyst is the same as in Example 1. Only the amount of carbon nanotubes was adjusted to 0.3 kg, the amount of magnesium chloride was adjusted to 54 kg, and the titanium content of the obtained solid catalyst component was 2.29 wt%.

[0096] (2) Ethylene slurry polymerization is the same as that in Example 1, the catalyst element content is shown in Table 1, and the polymerization results are shown in Table 2.

Embodiment 3

[0098] (1) Preparation of catalyst

[0099] Add 0.7 grams of TiCl successively to a 250ml four-neck bottle that has been purged with nitrogen 3 , 3.5 g anhydrous MgCl 2 , 130ml tetrahydrofuran, heated to 66°C under stirring, and reacted at this temperature for 3 hours. Cool down to 35°C, add 0.2 g of carbon nanotubes, and continue stirring for 1 hour.

[0100] Add 7 grams of silica gel (Cabot Corporation TS-610, particle size 0.05-0.5 μm) into a 250 ml four-neck bottle that has been purged with nitrogen, add the cooled mother liquor, keep the temperature at 35° C., and stir for 1 hour. The slurry was spray-dried with a spray dryer, spraying conditions: inlet temperature 140°C, outlet temperature 102°C, to obtain a solid catalyst component, wherein the titanium content was 2.17wt%.

[0101] (2) Ethylene slurry polymerization is the same as that in Example 1, the catalyst element content is shown in Table 1, and the polymerization results are shown in Table 2.

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Abstract

The invention discloses a catalyst used for alkene polymerization reaction, a preparation method and a composite catalyst. The catalyst comprises the following ingredients by counting in a way that the total weight of the catalyst is 100%: 5-50 wt% of ultrathin inorganic oxide carriers, 1-10 wt% of magnesium, 0.5-5 wt% of titanium, 5-40 wt% of electron donor compounds and 0.05-3 wt% of carbon nanotubes, wherein the molar ratio of the titanium to the magnesium is 0.1-10. The catalyst disclosed by the invention is high in activity and is narrower in particle size distribution, small particles inthe catalyst are especially few, and the content of fine powders in gaseous polymerization is low.

Description

technical field [0001] The invention relates to the technical field of olefin polymerization, and furthermore, relates to a catalyst for olefin polymerization, a preparation method and a composite catalyst. Background technique [0002] Since the early 1950s, Ziegler-Natta successively obtained polyethylene and polypropylene through low-pressure polymerization of titanium-based catalysts. A breakthrough has been made in aspects such as copolymerization ability. On this basis, researchers further realized that the particle morphology (including particle size and morphology) of Ziegler-Natta olefin polymerization catalysts is also an aspect that needs to be precisely controlled, so it has become a research hotspot in recent years. [0003] Ziegler-Natta type olefin polymerization catalyst particles have the special ability to copy their morphology to the polyolefin powder particles they produce. For example, spherical catalyst particles usually produce spherical powder parti...

Claims

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Application Information

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IPC IPC(8): C08F4/649C08F110/02C08F2/34C08F4/02
CPCC08F110/02C08F4/6494C08F2/34C08F4/02
Inventor 李秉毅郭子芳周俊领王如恩寇鹏崔楠楠马永华傅捷
Owner CHINA PETROLEUM & CHEM CORP
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