Chromium-polyethylene catalyst

A catalyst and polyethylene technology, applied in the production of bulk chemicals, etc., can solve the problem of increasing the content of fine resin powder, and achieve the effect of improving particle strength and reducing the content of fine powder

Active Publication Date: 2013-06-19
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in increased resin fines content during polymerization

Method used

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  • Chromium-polyethylene catalyst
  • Chromium-polyethylene catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Add 300ml of deionized water and 2.17g of chromium acetate solution (11.5% chromium mass concentration) into 100g of silica gel, the mass ratio of silica gel to deionized water is 1:3, the mass of silica gel is in g, and the volume of deionized water is in ml .

[0054] Put the silica gel in an oven and dry it at 120°C for 10 hours to obtain a dry and mobile powder.

Embodiment 2～4

[0056] The mass of silica gel and the volume ratio of deionized water in Examples 2 to 4 are respectively 1: 2.2, 1: 1.6, and 1: 10. The mass of silica gel is in g, and the volume of deionized water is in ml. All the other steps are the same as in Example 1. same.

Embodiment 5

[0066] The catalyst prepared in Example 1 was placed in a quartz tube activator, and the catalyst was dried under a nitrogen atmosphere. The catalyst was first heated from room temperature to 200°C, and kept at 200°C for 1 hour. Then the temperature was raised to 600° C., and calcined in the air for 4 hours, and then the temperature was slowly lowered to room temperature to obtain dry and fluid catalyst powder.

[0067] Take 5 g of the above-mentioned catalyst powder into the catalyst preparation bottle, add 100 ml of n-hexane, and raise the temperature to 45°C. According to the molar ratio of aluminum to chromium of 6:1, add ethoxy diethylaluminum to reduce the catalyst for 30 minutes. The temperature was raised to 70°C, and the catalyst was dried for 24 hours.

[0068] The catalyst was subjected to polymerization evaluation. The polymerization temperature was 92° C., the ethylene pressure was 1.2 MPa, and the polymerization time was 1 hour. See Table 2 for the evaluation ...

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Abstract

The invention relates to a chromium-polyethylene catalyst, and belongs to the technical field of polyethylene catalysts. The chromium-polyethylene catalyst is composed of chromium salt, an inorganic metal oxide support and a promoter. A preparation method for the chromium-polyethylene catalyst comprises the following steps of: preparing the chromium salt into solution; mixing the solution with the inorganic metal oxide support; and sequentially pre-drying, as well as drying, roasting and reducing in an inert gas environment to prepare the chromium-polyethylene catalyst. According to the preparation method disclosed by the invention, a novel chromium-polyethylene catalyst higher in polymerization activity and strength than the traditional chromium-polyethylene catalyst is prepared by adjusting the ratio of the mass of the inorganic metal oxide support to the volume of the solvent during a catalyst soaking process; and the resin prepared form the catalyst is improved in particle strength and reduced in fine powder content.

Description

technical field [0001] The invention relates to a chromium-based polyethylene catalyst and belongs to the technical field of polyethylene catalysts. Background technique [0002] As an important species of ethylene polymerization catalysts, chromium-based catalysts were first used in the production of polyethylene. Catalysts are generally prepared by loading the chromium source on silica gel (SiO 2 ) or silica-alumina (SiO 2 -Al 2 o 3 ) and other catalyst supports, the catalyst is activated by thermal activation or chemical activation. Supported chromium-based catalysts have been widely used in solution, slurry, and gas phase polyethylene production processes. The PE resin prepared by chromium-based catalysts can be used in hollow molding fields such as bottles and cans to produce products with more complex shapes, better processing rotation, and thicker fusion parts at the cut-off mouth. This is because the resin contains long-chain branches. Components and a small am...

Claims

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Application Information

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IPC IPC(8): C08F10/02C08F4/69C08F4/02
CPCY02P20/52
Inventor 李留忠严婕达建文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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