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Catalyst for gas-phase polymerization or copolymerization of ethylene and preparation method thereof

A gas-phase polymerization and catalyst technology, which is applied in the production of bulk chemicals, etc., can solve the problems of reducing the performance of polyethylene resin products and unsatisfactory polymerization product forms, and achieve good particle shape, high polymerization activity, and less fine powder. Effect

Inactive Publication Date: 2013-04-24
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalytic activity of the catalyst and the morphology of the polymerized product are still unsatisfactory, and when the catalyst is applied to the copolymerization of ethylene and higher α-olefins such as 1-hexene, the content of hexane extractables in the resulting polymer is still high, which will reduce the final product performance of polyethylene resin

Method used

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  • Catalyst for gas-phase polymerization or copolymerization of ethylene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1), catalyst preparation:

[0022] to pass through N 2 Add 5.0g TiCl to the fully replaced 500mL catalyst preparation reactor 3 , 9.0 g MgCl 2 and 220mL tetrahydrofuran, heated to 65°C under stirring, reacted at constant temperature for 2 hours, added sorbitan ester (span80) at a ratio of 1:0.3 by the molar ratio of Mg to surfactant, reacted at constant temperature at 65°C for 3 hours, cooled to room temperature.

[0023] to the other via N 2 After adding 13.5 grams of silica gel (0.02-0.1 μm in particle size) into a fully replaced 500mL reactor, add the cooled mother liquor and stir for 2 hours. Use a spray dryer to spray-dry the mother liquor, spray Conditions: the inlet temperature is 150°C, the outlet temperature is 90°C, and the solid catalyst component is obtained, wherein the Ti content is 2.28% (wt), the Mg content is 5.91% (wt), and the THF content is 28.3% (wt). Add mineral oil in the solid catalyst component that obtains, be made into the mineral oil so...

Embodiment 2

[0027] (1), catalyst preparation:

[0028] to pass through N 2 Add 5.0g TiCl to the fully replaced 500mL catalyst preparation reactor 3 , 9.0 g MgCl 2 and 220mL tetrahydrofuran, heated to 65°C under stirring, reacted at constant temperature for 2 hours, added hexadecyltrimethylammonium bromide at a ratio of 1:0.3 in the molar ratio of Mg to surfactant, and reacted at constant temperature at 65°C for 3 hours, Cool to room temperature.

[0029] to the other via N 2After adding 13.5 grams of silica gel (0.02-0.1 μm in particle size) into a fully replaced 500mL reactor, add the cooled mother liquor and stir for 2 hours. Use a spray dryer to spray-dry the mother liquor, spray Conditions: the inlet temperature is 150°C, the outlet temperature is 90°C, and the solid catalyst component is obtained, wherein the Ti content is 2.35% (wt), the Mg content is 6.02% (wt), and the THF content is 26.2% (wt). Add mineral oil in the solid catalyst component that obtains, be made into the mi...

Embodiment 3

[0033] (1) Catalyst preparation:

[0034] to pass through N 2 Add 5.0g TiCl to the fully replaced 500mL catalyst preparation reactor 3 , 9.0 g MgCl 2 and 220mL tetrahydrofuran, heated to 65°C under stirring, reacted at constant temperature for 2 hours, added sodium dodecylbenzenesulfonate at a ratio of 1:0.3 in the molar ratio of Mg to surfactant, reacted at constant temperature at 65°C for 3 hours, and cooled to room temperature.

[0035] to the other via N 2 After adding 13.5 grams of silica gel (0.02-0.1 μm in particle size) into a fully replaced 500mL reactor, add the cooled mother liquor and stir for 2 hours. Use a spray dryer to spray-dry the mother liquor, spray Conditions: the inlet temperature is 150°C, the outlet temperature is 90°C, and a solid catalyst component is obtained, wherein the Ti content is 2.31% (wt), the Mg content is 5.82% (wt), and the THF content is 30.1% (wt). Add mineral oil in the solid catalyst component that obtains, be made into the minera...

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Abstract

The invention relates to a catalyst for the gas-phase polymerization or copolymerization of ethylene and a preparation method thereof. The catalyst consists of a titanium-containing active ingredient and an active agent, wherein the titanium-containing active ingredient is formed by loading at least one kind of halogenated titanium, at least one kind of electron donor compound and a surfactant ona halogenated magnesium / silicon dioxide double carrier; the electron donor compound may be an alcohol or an ether; and the surfactant may be an anionic surfactant, a cationic surfactant or a nonionicsurfactant. A surfactant is added into the mother liquor of the active ingredient of the catalyst, so when the components of the catalyst are used for the polymerization or copolymerization reaction of ethylene together with an organic aluminum auxiliary catalyst, the obtained product of the polymerization of ethylene has low hexane-extractable material content, the catalytic activity of the catalyst is improved obviously, the grain shape and grain size distribution of polyethylene are improved obviously.

Description

Technical field: [0001] The invention relates to a catalyst for ethylene polymerization or copolymerization and a preparation method thereof, especially the application in condensed state or supercondensed state polymerization of ethylene gas-phase fluidized bed polymerization. Background technique: [0002] The gas-phase polymerization process of ethylene is the most typical Unipol gas-phase fluidized bed process, and the catalyst used is usually prepared by loading titanium and magnesium as active components on large-particle silica gel. The shape of the catalyst is completely determined by the shape of the silica gel carrier particles used, so the performance of the catalyst is also related to the particle size and microporous structure of the silica gel used. For example: the average particle size of the silica gel used in the catalyst used in the gas-phase fluidized bed polymerization process disclosed in US 4302565 is generally 40-80 microns. The linear low-density po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/02C08F210/16C08F2/34C08F4/646C08F4/649
CPCY02P20/52
Inventor 宁英男薛秋梅罗明检毛国梁姜涛张海燕
Owner NORTHEAST GASOLINEEUM UNIV
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