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Olefin polymerization catalyst, preparation method and composite catalyst

A composite catalyst and olefin polymerization technology, applied in the field of olefin polymerization, can solve the problems of rising fine powder content, fragmentation, insufficient catalyst activity, etc.

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
[0005] 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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  • Olefin polymerization catalyst, preparation method and composite catalyst
  • Olefin polymerization catalyst, preparation method and composite catalyst
  • Olefin polymerization catalyst, preparation method and composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] (1) Preparation of catalyst

[0086] to 2.5m 3 1300L tetrahydrofuran, 13 liters of TiCl 4 , 54 kg anhydrous MgCl 2 , 1.0 kg of styrene-maleic anhydride alternating copolymer (number-average molecular weight Mn=20000), 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 80 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 spraying conditions: inlet temperature 150° C., outlet temperature 100° C. to obtain 220 kg of solid catalyst components, wherein the titanium content was 2.17 wt%.

[0087] (2) Ethylene slurry polymerization

[0088] Add 1 liter of hexane to the 2-liter polymerization kettle that has been purged with nitrogen, and add 1 milliliter of 1 mmol triethylaluminum and 0.02 grams of catalys...

Embodiment 2

[0092] (1) The preparation of the catalyst is the same as in Example 1. Only the number-average molecular weight Mn of the styrene-maleic anhydride alternating copolymer is 80000, the dosage is still 1.0 kg, and the titanium content of the obtained solid catalyst component is 2.29 wt%.

[0093] (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

[0095] (1) Preparation of catalyst

[0096] 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 1.0 g of styrene-maleic anhydride alternating copolymer (number-average molecular weight Mn=75000), and continue stirring for 1 hour.

[0097] Add 6 grams of silica gel (Cabot Corporation TS-610, particle size 0.05-0.5 microns) 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 1.07wt%.

[0098] (2) Ethylene slurry polymerization is the same as that in Example 1, the catalyst element content is shown in...

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Abstract

The invention discloses an olefin polymerization catalyst, a preparation method and a composite catalyst. The catalyst comprises the following components, by 100% of the total weight of the catalyst,5 wt%-50 wt% of ultrafine inorganic oxide support, 1 wt%-10 wt% of magnesium, 0.5 wt%-5 wt% of titanium, 5 wt%-40 wt% of electron donor compound and 0.1 wt%-5 wt% of alternating copolymer macromolecule, wherein the molar ratio of magnesium to titanium is 0.1-10. According to the catalyst, the obtained polymer has higher stacking density, and has a higher melt index; and in addition, the catalyst has high activity, and has a low fragmentation degree and low fine powder content especially in gas phase polymerization.

Description

technical field [0001] The invention relates to the technical field of olefin polymerization, and furthermore, relates to an olefin polymerization catalyst, a preparation method and a composite catalyst. Background technique [0002] In the polymerization of ethylene or the copolymerization of ethylene and α-olefin, the performance of the catalyst affects the performance of the polymer. The catalyst catalyzes the polymerization of ethylene. As the polymer particles grow up, many polymer particles will be broken, and some severe broken products will become polymer fine powder. Especially in the gas phase polymerization process, due to the high initial polymerization rate and slow polymerization heat diffusion conduction, the fragmentation is more serious. When the crushing is serious to a certain extent, the proportion of fine powder will increase significantly, which will directly affect the stability of the operation of the gas phase polymerization device, and if it is mor...

Claims

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Application Information

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IPC IPC(8): C08F10/00C08F110/02C08F4/02C08F4/649
CPCC08F10/00C08F110/02C08F4/025C08F4/6494C08F2500/18
Inventor 李秉毅郭子芳周俊领寇鹏崔楠楠马永华傅捷王如恩黄廷杰
Owner CHINA PETROLEUM & CHEM CORP
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