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Catalyst system for ethylene polymerization

A catalyst and olefin polymerization technology, applied in the field of catalyst system, can solve the problem that the catalyst is not sensitive enough to hydrogen

Active Publication Date: 2013-03-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst can dissolve magnesium chloride to form a uniform and transparent solution. The obtained catalyst has a good particle shape and 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
  • Catalyst system for ethylene polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: the preparation of catalyst (A) component: after high-purity N 2 In the fully replaced reactor, add 4.0g of anhydrous MgCl successively 2, 28mL of decane, 24mL of 2-ethylhexanol, the temperature was raised to 130°C under stirring, and maintained for 3 hours, the temperature was lowered to 50°C, 3ml of tetraethoxysilane was added, and the stirring was continued for 2 hours. The magnesium chloride homogeneous 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-prepared magnesium chloride homogeneous solution into the titanium tetrachloride liquid, and slowly raise the temperature in 3 hours after the drop is completed to 110° 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.

[0037] The preparati...

Embodiment 2

[0042] Embodiment 2: the preparation of catalyst (A) component: after high-purity N 2 In the fully replaced reactor, add 4.0g of anhydrous MgCl successively 2 , 28mL of decane, 24mL of 2-ethylhexanol, the temperature was raised to 130°C under stirring, and maintained for 3 hours, the temperature was lowered to 50°C, 3ml of tetraethoxysilane was added, and the stirring was continued for 2 hours. The magnesium chloride homogeneous 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-prepared magnesium chloride homogeneous solution into the titanium tetrachloride liquid, and slowly raise the temperature in 3 hours after the drop is completed To 110°C, add 1.0ml of tetraethoxysilane, and react 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....

Embodiment 3

[0045] Embodiment 3: same as embodiment 2, only change the consumption of trichloroethanol in the catalyst (B) component preparation into 10ml concentration and be the hexane solution of 0.002N trichloroethanol. Ethylene polymerization is the same as the high hydrogen polymerization of Example 1.

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Abstract

The invention provides a catalyst system for ethylene polymerization or copolymerization. The catalyst system comprises a solid catalyst component (A) and a solid catalyst component (B). A magnesium halide is dissolved in an organic alcohol to form a uniform solution and the solution reacts with a halide of transition metal titanium or its derivative and a reactive hydrogen-free organosilicon compound to produce the solid catalyst component (A). An aluminum alkyl compound and a halohydrin are mixed into the solid catalyst component (B). The catalyst system is used for ethylene polymerization or copolymerization and has characteristics of high activity, high bulk density and good catalyst hydrogen regulation sensitivity.

Description

technical field [0001] The invention relates to a catalyst system for olefin polymerization, especially ethylene polymerization, as well as the preparation method and application of the catalyst component. technical background [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. [0003] 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...

Claims

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Application Information

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IPC IPC(8): C08F10/00C08F4/649C08F10/02
Inventor 孙怡菁周俊领马冬李颖黄廷杰王丽莎
Owner CHINA PETROLEUM & CHEM CORP
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