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Catalyst for ethylene polymerization and application

A technology of ethylene polymerization and catalyst, which is applied in the field of ethylene polymerization catalyst and its application, can solve the problem of low polymerization activity of the catalyst, and achieve the effect of high activity and good hydrogen adjustment sensitivity

Inactive Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common disadvantage of the widely used polyethylene catalysts is that when the amount of hydrogen added is slightly higher, the catalyst polymerization activity is very low
However, such catalysts have not been reported for ethylene polymerization

Method used

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  • Catalyst for ethylene polymerization and application
  • Catalyst for ethylene polymerization and application
  • Catalyst for ethylene polymerization and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In the reactor fully replaced by pure nitrogen, add 48g of magnesium chloride, 1160mL of toluene, 40mL of epichlorohydrin, and 125mL of tributyl phosphate in sequence, raise the temperature to 60°C under stirring, and maintain it for 2h. The solid is completely dissolved, and then add phthalic anhydride 14g, continue to maintain for 1h. Cool the solution to below -29°C, add TiCl dropwise 4 560mL, after the dropwise addition, the temperature was raised to 80°C at a constant speed, and the temperature was maintained for 1h. After filtering, it was washed twice with 600mL of toluene, and washed four times with 600mL of hexane to obtain a solid containing magnesium and titanium, which was set aside.

[0049] In the reactor fully replaced by pure nitrogen, 5 g of the above-mentioned magnesium and titanium solids, 440 mL of TiCl, 60 mL of toluene, 2 mmol of 3,5-heptanediol bis(4-propyl benzoate) were added successively, and the temperature was raised to 95 ℃, and maintained ...

Embodiment 2

[0051] The method is the same as in Example 1, except that 2,4-pentanediol bis(4-propyl benzoate) is used instead of 3,5-heptanediol bis(4-propyl benzoate).

Embodiment 3

[0053] The method is the same as in Example 1, except that 2,4-pentanediol dibenzoate replaces 3,5-heptanediol bis(4-propyl benzoate).

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Abstract

The invention belongs to the field of catalysts, and discloses a catalyst for ethylene polymerization and application. The catalyst comprises a reaction product of the following components: 1) a catalyst component and 2) an organoaluminum compound. The catalyst component comprises at least one titanium compound and at least one polyol ester electron donor compound with a structure shown as a formula (I), the titanium compound and the electron donor compound are loaded on a solid containing magnesium and titanium, in the formula (I), R1, R2, R3, R4, R5 and R6 are the same or different and are selected from hydrogen, halogens, substituted or unsubstituted linear or branched C3-C20 alkyl, aryl, alkaryl, aralkyl, alkenyl and condensed ring aryl, R1 and R2 are the same or different and are selected from hydrogen, halogens, substituted or unsubstituted straight-chain or branched-chain C1-C20 alkyl, cycloalkyl, aryl, alkaryl, aralkyl, alkenyl and condensed ring aryl . When the catalyst is used for ethylene polymerization, the activity is high, the activity is very high under a high hydrogen condition, and the hydrogen regulation sensitivity is good.

Description

technical field [0001] The invention belongs to the field of catalysts, and more specifically relates to a catalyst for ethylene polymerization and its application. Background technique [0002] By controlling the molecular weight distribution of ethylene polymers to make them have a wider molecular weight distribution or bimodal distribution, and to obtain resins with better properties, it is one of the development directions of polyethylene production technology at present. In order to achieve the above purpose, the most commonly used method at present is: use double reactors in series, and adjust the addition of chain transfer agent hydrogen to make the two reactors produce macromolecular polymers and small molecular polymers respectively, so that the molecular weight is approximately Bimodal distribution purposes. But the common shortcoming of the widely used polyethylene catalysts is: when the amount of hydrogen added is slightly higher, the polymerization activity of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/649
CPCC08F10/02C08F4/6497C08F4/6494
Inventor 高明智蔡晓霞周俊领刘海涛马吉星何世雄刘文蕊许景琦王军胡建军张晓帆李昌秀马晶
Owner CHINA PETROLEUM & CHEM CORP