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Preparation method for chromium catalyst for vinyl polymerization

A chromium-based catalyst, ethylene polymerization technology, applied in the production of bulk chemicals, etc., can solve problems that have not been seen, and achieve the effect of a wide range of melting index

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

[0006] There are no related patents, documents and reports on the preparation of reduced chromium-based catalysts using CO gas and alkylaluminum as reducing agents.

Method used

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  • Preparation method for chromium catalyst for vinyl polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Weigh 0.4497 g of 50% chromium acetate solution in a 100 ml dry beaker, add 60 ml of deionized water to form a solution. Weigh 20 grams of 955 silica gel in a 1000ml dry beaker, slowly add the prepared chromium acetate solution into the silica gel under stirring, stir to make the silica gel and chromium acetate solution fully contact, and mix evenly. After soaking for 4 hours, the material was dried at 60°C for 12 hours. Move the dried load into a Φ30×500mm quartz tube, pass high-purity nitrogen gas into the bottom, activate at a constant temperature of 200°C for 2 hours, then raise the temperature to 600°C, and switch the activation gas from high-purity nitrogen when the temperature rises to 300°C In dry air, maintain 600°C for 4 hours for activation. After the activation, stop heating and lower the temperature slowly, and switch the activation gas from air to high-purity nitrogen when the temperature drops to 300°C. After the material is lowered to room temperature, ...

Embodiment 2～4

[0043] The activation temperatures of Examples 2-4 are 500°C, 700°C, and 800°C respectively, and the rest of the steps are the same as in Example 1. The polymerization activity of the prepared polyethylene and the molecular weight of the prepared polyethylene are shown in Table 1.

[0044] Table 1 embodiment 1~4 experimental result

[0045] serial number

Embodiment 5～9

[0047] The carbon monoxide reduction time of Examples 5-9 is 6 min, 10 min, 30 min, 120 min, 240 min respectively, and the remaining steps are the same as in Example 1. The polymerization activity of the prepared polyethylene and the molecular weight of the prepared polyethylene are shown in Table 2.

[0048] Table 2 embodiment 1,5,6,7 experimental result

[0049] serial number

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Abstract

The invention relates to a preparation method for a chromium catalyst for vinyl polymerization, and belongs to the technical field of catalyst preparation. According to the preparation method disclosed by the invention, silica gel is used as a support, inorganic chromium is used as an active component, the active component is supported on the silica gel support in a soaking manner, the catalyst product is obtained via drying, high-temperature activation, and aluminium alkyl and carbon monoxide reduction process, and high-density polyethylene products with different performances can be prepared by adjusting the preparation process conditions of the catalyst. The catalyst is higher in polymerization activity than the industrial chromium catalyst used in the existing production device in the same pilot test evaluation condition; and moreover, the performance of the prepared resin meets the index requirements of the high-density polyethylene products, so that high-density polyethylene resin with a wide molecular weight range can be obtained.

Description

technical field [0001] The invention relates to a preparation method of a chromium-based catalyst for ethylene polymerization, belonging to the technical field of catalyst preparation. Background technique [0002] Polyethylene (PE) has become the variety with the largest output in general-purpose synthetic resins due to its advantages of high performance and low price, mainly including low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE) , medium density polyethylene (MDPE) and some special resins with special properties. Catalyst technology is the core of the polyethylene industry, and the research and development of catalysts for polyethylene resins with special properties or excellent properties is currently the focus of attention in the field of polyethylene applications. The catalytic processes currently being researched and developed include Ziegler-Natta catalysts, chromium-based catalysts, metallocene catalysts,...

Claims

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Application Information

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IPC IPC(8): C08F10/02C08F4/69
CPCY02P20/52
Inventor 李留忠严婕达建文徐晓李功韬范大鹏齐立芳周建勇李晓庆毕晓龙
Owner CHINA PETROLEUM & CHEM CORP
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