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Modified Ti-Mg catalyst as well as preparation method and application thereof

A catalyst and modification technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of improving catalyst activity, improving hydrogen sensitivity, and easily obtaining raw materials

Active Publication Date: 2011-06-29
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no report on the regulation of molecular weight and molecular weight distribution of polyethylene by adding different electron donors, especially compound electron donors, in the preparation of ethylene polymerization catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Catalyst preparation:

[0044] (1) Under the protection of argon, add 30ml of n-decane, 3.0g of anhydrous magnesium chloride and 12.4ml of isooctyl alcohol to the reactor with a mechanical stirrer, and heat up to 130°C for 3 hours to obtain a homogeneous Solution A.

[0045] (2) At 50°C, add 2.25ml (10mmol) ethyl orthosilicate (TEOS) and react for 1 hour to obtain reactant B,

[0046] (3) At 50°C, add 3.0g of thermally activated SiO 2 , reacted for 4h to obtain composite carrier C,

[0047] (4) Cool the composite carrier C solution obtained above to about -8°C, add 100mL TiCl dropwise 4 into the alcoholate solution. After dropping, keep the temperature of the mixture below -5°C for 0.5 hours, then slowly raise the temperature to 110°C,

[0048] (5) Add 0.84ml (3.15mmol) dibutyl phthalate (DNBP) and 0.22g (1.58mmol) p-nitroaniline (p-NA), and keep this temperature for 2 hours,

[0049] (6) Wash the reactant twice with toluene at 100° C., wash the reactant five time...

Embodiment 2～11

[0053] The catalyst preparation method and polymerization characterization method are the same as in Example 1. The substances and amounts added in the specific preparation are shown in Table 1, and the polymerization results are shown in Table 2.

[0054] Table 1 Catalyst preparation Added substances, dosage and content of each component in the catalyst

[0055]

[0056]

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PUM

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Abstract

The invention relates to a modified Ti-Mg catalyst as well as a preparation method and application thereof. The catalyst takes porous silica gel and anhydrous magnesium chloride as carriers, titanium-containing transition metal as an active component and an electron donor compound as a modifier. The modified Ti-Mg catalyst contains, based on the weight percentage, 1.2% to 7.9% of Ti, 4.0% to 12.6% of Mg:, 0.2% to 8.6% of the electron donor compound: and the balance of the carriers. A polyethylene product produced by using the catalyst has the characteristics that the molecular weight distribution range is increased to the range from 5.2 to 13.2 and the molecular weight distribution range is controllable, so that the processing property of resin is greatly improved and the application range of the product is broadened.

Description

technical field [0001] The invention relates to a catalyst in which an electron donor compound is added as a modifier in the catalyst preparation process, and a method for preparing polyethylene with controllable molecular weight distribution through homopolymerization of ethylene or copolymerization with alpha-olefin. Background technique [0002] With the development of polyethylene industry, the production of high-performance polyethylene has become the focus of attention. In order to achieve high performance of polyethylene resin, it is required to have excellent processing performance while maintaining good mechanical properties of polyethylene. The development of polyethylene resins with a broad / bimodal molecular weight distribution can meet this requirement. At present, there are three main methods for producing ethylene polymers with broad / bimodal molecular weight distribution: melt mixing method, segmented reaction method and one-stage reaction method. The melt mi...

Claims

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Application Information

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IPC IPC(8): B01J31/02B01J21/10B01J37/00C08F110/02C08F4/654C08F4/651C08F4/02
Inventor 张瑞任合刚王路海刘宾元宋磊杨敏邹恩广刘盘阁韦德帅张旭吴林美张怀志王华李冬霞方宏王涛张铭辉赵成才姜进宪邱丽萍刘玉珍林李秋谷振生
Owner PETROCHINA CO LTD
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