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Catalyst component for ethylene polymerization and preparation method thereof

An ethylene polymerization and catalyst technology, applied in the field of catalyst components for ethylene polymerization, can solve the problems of uncontrollable particle size distribution, low activity and low bulk density of the catalyst

Active Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In summary, in view of the complexity, low activity, and low bulk density in Chinese patents CN200710065207.7 and CN00124701.8, and the uncontrollable particle size and particle size distribution of catalysts prepared in Chinese patents CN96106647 and CN200980112197.5 , it is inevitable to generate a large number of small-sized catalyst particles and other problems. At present, there is an urgent need to research and develop a high-activity, wide resin molecular weight distribution, high resin bulk density, uniform particle diameter and good particle shape, which is suitable for INNOVENES process production. Catalyst for small hollow resin materials

Method used

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  • Catalyst component for ethylene polymerization and preparation method thereof
  • Catalyst component for ethylene polymerization and preparation method thereof
  • Catalyst component for ethylene polymerization and preparation method thereof

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[0042] In some embodiments of the present invention, the magnesium compound is selected from one or more of magnesium dihalides, complexes formed between magnesium dihalides and water, alcohols or electron donors. Specific examples of the magnesium dihalide include, for example, one or more of magnesium dichloride, magnesium dibromide, magnesium difluoride and magnesium diiodide. Preferably, the magnesium dihalide is magnesium dichloride. Specific examples of the complexes formed by the magnesium dihalide and water, alcohol or electron donors include, for example, magnesium dihalide and water, methanol, ethanol, propanol, butanol, pentanol, hexanol, isooctyl alcohol, One or more of the complexes formed by ammonia, hydroxyammonia, ether and ester compounds.

[0043] In some embodiments of the present invention, the general formula of the titanium compound is as shown in formula (I):

[0044] Ti(OR 1 ) a x 1 b (I)

[0045] In general formula (I), R 1 from C 1 -C 14 al...

Embodiment 1

[0092] Preparation of catalyst components: In a reactor that has been fully replaced by high-purity nitrogen, add 4.0g of magnesium dichloride, 90mL of toluene, and 7.0mL of isooctyl alcohol in sequence, and raise the temperature to 120°C under stirring. When the solids are completely dissolved to form a uniform solution Then, it reacted at 120 degreeC for 2 hours. The system was cooled to -5°C, and a mixture of 30 mL of titanium tetrachloride and 30 mL of toluene was slowly added dropwise. Slowly heat up to 85°C and react for 2 hours. Stop stirring, let it stand, the suspension will be layered quickly, the upper clear layer will be pumped off, and washed four times with hexane. Blow dry with high-purity nitrogen to obtain a solid catalyst component with good fluidity. The catalyst particle size data are shown in Table 1.

[0093] Ethylene polymerization experiment: a stainless steel reaction kettle with a volume of 2L was fully replaced by high-purity nitrogen, 1L of hexan...

Embodiment 2

[0095] The preparation method of the catalyst component was the same as in Example 1, except that the amount of titanium tetrachloride was changed to 20 mL, and the amount of toluene was changed to 40 mL. The catalyst particle size data are shown in Table 1.

[0096] Ethylene polymerization experiment is the same as embodiment 1. The aggregation results are shown in Table 2.

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Abstract

The invention relates to a catalyst component for ethylene polymerization and a preparation method thereof. According to the preparation method, magnesium compounds are dissolved into a solvent system containing organic alcohol compounds and titanate compounds to form a magnesium composite, and then the magnesium composite is contacted with toluene and titanium compounds to carry out reactions so as to prepare the catalyst component. The catalyst component and a catalyst containing the catalyst component have the advantages of high catalytic activity, uniform particle diameter, and good particle shape and can be applied to ethylene polymerization reactions; and the obtained polyethylene resin has the advantages of wide molecular weight distribution, high resin stacking density, concentrated particle size distribution of PE powder, little fine powder content, and long production period, and can be advantageously used to produce small hollow resins in INNOVENES technology by adopting a single peak mode.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst component for ethylene polymerization and a method thereof. Background technique [0002] The grade HD5502 small hollow resin produced by INNOVENES technology uses Cr-based catalysts, but due to the low activity of Cr-based catalysts, which are only 2000-3500 times more active, the production cost of the resin is greatly increased. If a highly active Ti-based catalyst is used to produce small hollow resins in the INNOVENES process, a bimodal mode must be adopted, that is, the intermediate processing unit must be in operation, and the material and energy consumption of its operation will also virtually increase the production cost of the resin. To sum up, if you want to use a highly active Ti-based catalyst to produce a qualified small hollow resin material without running an intermediate processing unit, you must improve the molecular weight distribution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F210/02C08F4/649C08F4/654C08F4/651
CPCC08F110/02C08F210/02C08F4/6494C08F4/6543C08F4/651
Inventor 朱孝恒郭子芳曹昌文苟清强杨红旭俸艳芸李颖
Owner CHINA PETROLEUM & CHEM CORP
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