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Catalyst system for olefin polymerization, and application of catalyst system

A catalyst and ethylene polymerization technology, applied in the production of bulk chemicals, etc., can solve the problem that the catalyst is not sensitive enough to hydrogen, and achieve the effects of broadening the molecular weight distribution, improving the sensitivity of hydrogen adjustment, and widening the molecular weight distribution

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

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 olefin polymerization, and application of catalyst system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation of catalyst (A) component:

[0030] In the high-purity N 2 In the fully replaced reactor, add 4.0g of anhydrous MgCl successively 2 , 28mL decane, 24mL 2-ethylhexanol, raise the temperature to 130°C with stirring, and maintain it for 3 hours, cool down to 50°C, add 3ml tetraethoxysilane, continue stirring for 2 hours, and then cool the solution 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 solution into the titanium tetrachloride liquid, and slowly raise the temperature to 110°C in 3 hours after the drop is completed , 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.

[0031] Ethylene polymerization:

[0032] A stainless steel kettle with a volume of 2 liters was subjected to H 2 After full replacement, ad...

Embodiment 2

[0034] Others are the same as in Example 1, except that the Ti molar ratio between germanium tetrachloride and solid catalyst component A is changed to 90 during the polymerization, and the Ti molar ratio between monobromocyclopentane and solid catalyst component A is 5. See Table 1 for the data.

Embodiment 3

[0036] In the high-purity N 2 In the fully replaced reactor, add 4.0g of anhydrous MgCl successively 2 , 28mL decane, 24mL 2-ethylhexanol, raise the temperature to 130°C with stirring, and maintain it for 3 hours, cool down to 50°C, add 3ml tetraethoxysilane, continue stirring for 2 hours, and then cool the solution 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 prepared solution into the titanium tetrachloride liquid, and then add 3ml of germanium tetrachloride after dripping, The temperature was gradually raised to 110° C. over 3 hours, and the reaction was carried out at this temperature for 2 hours. The mother liquor was removed and the solid was washed several times with hexanes to give the product as a solid.

[0037] Ethylene polymerization: a stainless steel kettle with a volume of 2 liters is passed through H 2 After sufficient replace...

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Abstract

The invention provides a catalyst system for vinyl polymerization. The catalyst system for the vinyl polymerization is prepared from the following components: a component A: a titanium-containing solid catalyst component, a component B: an organic aluminum compound, a component C: a halogenated naphthene compound, and a compound D: a halogenated metal compound, wherein a preparation method of the component A comprises the steps of dissolving magnesium halide into a solvent system containing an organic alcohol compound so as to form a solution, adding a reactive hydrogen-free organic silicon compound into the solution to obtain a mixed solution, then enabling the mixed solution to react with a titanium compound by contacting for carrying out a titanium loading process, optionally adding or not adding the reactive hydrogen-free organic silicon compound and carrying out reaction, stirring, and then washing. When being used for the vinyl polymerization, the catalyst system provided by the invention is not only higher in catalytic activity, but also is higher in hydrogen sensitivity, thus being suitable for producing polyethylene with wide molecular weight distribution and high melt index.

Description

technical field [0001] The present invention relates to a catalyst system for olefin polymerization and the application of the catalyst system. [0002] technical background [0003] 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. [0004] 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 concentration and polymerization conditions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F110/02C08F4/649C08F4/648C08F4/654C08F4/656C08F4/651
CPCC08F10/00C08F110/02C08F2500/04C08F4/6543C08F4/6565C08F4/651C08F4/6493C08F4/648Y02P20/52
Inventor 孙怡菁周俊领马冬郭子芳黄廷杰
Owner CHINA PETROLEUM & CHEM CORP
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