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Organic chromium catalyst for ethylene polymerization and preparation method thereof

A technology of ethylene polymerization and catalyst, applied in chemical recycling, bulk chemical production, etc., can solve the problem of high production cost and price

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silylchromate catalysts are generally more expensive to produce than chromia catalysts

Method used

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  • Organic chromium catalyst for ethylene polymerization and preparation method thereof
  • Organic chromium catalyst for ethylene polymerization and preparation method thereof
  • Organic chromium catalyst for ethylene polymerization and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Weigh 0.87 g of a chromium acetate aqueous solution with a concentration of 50% by weight, with a chromium content of 11.5% by weight, and add 56 ml of deionized water. Add the prepared chromium acetate aqueous solution to 20 g of Davison 955 silica gel, mix and immerse for 6 hours, and then dry at 60-120°C for more than 12 hours in an air atmosphere. Then put the dried catalyst matrix into a Φ30×500mm quartz tube activator welded with a sintered quartz distribution plate at the bottom, and pass dehydrated and deoxidized high-purity nitrogen to fluidize the catalyst. Heat up the quartz tube activator at 200°C for 2 hours to further remove moisture from the catalyst. The temperature is raised to 325°C, and then switched to dehydrated dry air. The temperature is raised to 600°C and maintained for 4 hours, and finally switched back to high-purity nitrogen. After the activator is cooled to room temperature, the chromium oxide catalyst is taken out and stored in a nitrogen at...

Embodiment 2

[0083] The process of Examples 2-5 is similar to that of Example 1, except that the PS modifiers are added in different amounts. In Example 2, the amount of PS modifier added was 25ml, TPS:Cr=1.0; in Example 3, the amount of PS modifier added was 18.75ml, TPS:Cr=1.5; in Example 4, the amount of PS modifier added was 25ml, TPS:Cr=2.0; in Example 5, PS modifier 20.83ml, TPS:Cr=3.0.

Embodiment 5

[0092] The modifier concentration in Example 5 is 1.15×10 -2 mol / L.

[0093] Table 2 Polymerization conditions: 85°C, pressure: normal pressure, polymerization time: 1 hour

[0094]

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Abstract

The invention provides an organic chromium catalyst for ethylene polymerization and a preparation method thereof. The catalyst comprises a main active catalyst, an inorganic oxide carrier, a modifier and a cocatalyst, wherein the main active catalyst is a chromium salt, and the content of the main active catalyst in the catalyst is 0.01-5% by mass; technical requirements of the carrier inorganic oxide comprise that the surface area is about 200-700m<2> / g, the pore volume is about 1-4cc / g, the aperture is about 60-700 and the particle dimension is about 10-200mum; the modifier is a recovery liquid for the preparation of an alkylsilane chromate catalyst; and the cocatalyst is an alkyl compound of Al, Li, B and Zn. The organic chromium catalyst for the ethylene polymerization provided in theinvention has the advantages of high activity, proper induction time, and suitableness of the production of wide molecular weight distribution range polyethylene products; and the preparation method provided in the invention has the advantages of simple synthetic technology and low preparation cost.

Description

Technical field [0001] The invention is an organic chromium catalyst for ethylene polymerization and a preparation method thereof. Belongs to ethylene polymerization catalyst. In particular, it relates to a supported organic chromium ethylene polymerization catalyst and a preparation method thereof. Background technique [0002] As an important species of ethylene polymerization catalyst, chromium-based catalysts were first used in the production of polyethylene. From the original in silica gel (Si0 2 ) Or silica gel-alumina (SiO 2 -Al 2 O 3 So far, people have found that the preparation method of silica gel and the activation method after loading the chromium-based catalyst can change the relative molecular weight (hereinafter referred to as molecular weight) of the product. Supported chromium-based catalysts have been widely used in solution, slurry, and gas phase PE production processes. The PE resin made by the chromium catalyst can be made into products with more complica...

Claims

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Application Information

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IPC IPC(8): C08F10/02C08F4/69C08F4/02
CPCY02P20/52Y02P20/584
Inventor 严婕达建文李留忠刘伯平李功韬徐晓范大鹏齐立芳周建勇李晓庆毕晓龙
Owner CHINA PETROLEUM & CHEM CORP
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