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Catalyst system for ethylene polymerization, and applications thereof

A technology of ethylene polymerization and catalyst, which is applied in the field of catalyst system, can solve the problem of insufficient sensitivity of the catalyst to hydrogen, and achieve the effects of improving catalytic activity and hydrogen tuning sensitivity, broadening the molecular weight distribution, and high catalytic activity of ethylene polymerization

Active Publication Date: 2017-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the catalyst is prepared, magnesium chloride is dissolved to form a uniform and transparent solution, and the obtained catalyst has a good particle shape, which shows high activity and high apparent density for ethylene polymerization, but the sensitivity of the catalyst to hydrogen is not good enough

Method used

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  • Catalyst system for ethylene polymerization, and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of Component A:

[0029] In the high-purity N 2 In the fully replaced reactor, add 4.0g of anhydrous MgCl successively 2 , 28mL of decane, 24mL of 2-ethylhexanol, heated to 130°C with stirring, and maintained for 3 hours, cooled to 50°C, added 3ml of tetraethoxysilane, and continued to stir for 2 hours to obtain a mixed solution. The mixed solution was cooled to room temperature. In another high-purity N 2 Add 100ml of titanium tetrachloride to the fully replaced reactor, cool it to -5°C under stirring, slowly add the above-mentioned mixed solution to the titanium tetrachloride liquid, and slowly raise the temperature to 110°C in 3 hours after the drop is completed. °C, and then reacted at this temperature for 2 hours. The mother liquor was removed, and the solid was washed several times with hexane to obtain a solid catalyst component A.

[0030] Ethylene polymerization

[0031] A stainless steel kettle with a volume of 2 liters was subjected to H 2 ...

Embodiment 2

[0033] Component A is the same as in Example 1, except that germanium tetrachloride is added in the polymerization so that the molar ratio of Ti in the solid catalyst component is changed to 9.

Embodiment 3

[0035] Component A is the same as in Example 1, except that germanium tetrachloride is added in the polymerization so that the molar ratio of Ti in the solid catalyst component is changed to 18.

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Abstract

The present invention discloses a catalyst system for ethylene polymerization. The catalyst system comprises a component A titanium-containing solid catalyst component, a component B organic aluminum compound, and a component C halogenated metal compound, wherein the component A preparation method comprises: dissolving magnesium halide in a solvent system containing an organic alcohol compound to form a solution, adding an active-hydrogen-free organosilicon compound to obtain a mixed solution, carrying out a contact reaction on the mixed solution and a titanium compound to carry out a titanium loading process, optionally adding or doing not add an active-hydrogen-free organosilicon compound and carrying out a reaction, stirring, and washing. The invention further relates to the applications of the catalyst system in ethylene polymerization. According to the present invention, with the application of the catalyst system in ethylene polymerization, the ethylene polymerization activity can be improved and the apparent density of the polymer can be improved.

Description

technical field [0001] The invention relates to a catalyst system for olefin polymerization, especially ethylene polymerization, as well as a preparation method and application of the catalyst system. Background technique [0002] As we all know, polyethylene resin with wide molecular weight distribution has comprehensive physical and mechanical properties and processing properties, and is widely used in film materials, pipes, hollow products and cable materials. The polymerization process for producing polyethylene with a wide molecular weight distribution mainly adopts the polymerization method of staged hydrogenation multi-stage reactors in series. The common one is the double-reactor series polymerization process, including liquid-liquid-phase process, gas-phase-gas-phase process and liquid-gas-phase process. In the double-reactor polymerization process, the polyethylene produced in different reactors has different molecular weights mainly by adjusting the hydrogen conc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/658C08F4/646C08F110/02
Inventor 孙怡菁周俊领马冬郭子芳黄廷杰
Owner CHINA PETROLEUM & CHEM CORP
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