A method for preparing silica microspheres, the prepared silica microspheres, and their applications.

By utilizing the synergistic effect of n-alkane treatment of asphalt and PEO-PPO-PEO copolymer, combined with hydrothermal crystallization and spray drying technologies, silica microspheres with high specific surface area and large pore volume were prepared. This solved the problem of pore structure collapse in silica microspheres in existing technologies and significantly improved the catalytic activity of olefin polymerization.

CN122079176APending Publication Date: 2026-05-26CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202411706975.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-26
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In the existing technology for preparing silica microspheres, the surface tension of water causes the macroporous structure to collapse, resulting in a significant decrease in specific surface area and pore volume, which affects its catalytic activity in olefin polymerization reactions.

Method used

Using n-alkane-treated asphalt and PEO-PPO-PEO copolymer as additives, combined with hydrothermal crystallization and spray drying technology, silica microspheres with macroporous structures were prepared. Through the synergistic effect of n-alkane-treated asphalt and PEO-PPO-PEO copolymer, a larger pore structure was formed, which improved the specific surface area and pore volume.

Benefits of technology

The prepared silica microspheres have high specific surface area, pore volume and average pore size, which significantly improves the polymerization activity when used as an olefin polymerization catalyst, with a polymerization index of up to 5450.3 gPE/gcat·h.

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Abstract

This invention discloses a method for preparing silica microspheres, the prepared silica microspheres, and their applications. The method for preparing silica microspheres includes: (1) heating a mixture of n-alkane and pitch under reflux to separate a solid product; (2) mixing the solid product from step (1) with a mixture of aromatics I, a first silicon source, a polyoxyethylene-polyoxypropylene-polyoxyethylene copolymer, and water to obtain a crystallization solution, followed by hydrothermal crystallization and calcination to obtain an intermediate product; (3) mixing the intermediate product from step (2), a second silicon source, a pore-forming agent, and water to obtain a slurry; then, spray-drying and calcining the slurry to obtain the silica microspheres. The silica microspheres prepared by this method have the advantages of large specific surface area, large pore volume, and large average pore size, which significantly improves polymerization activity in olefin polymerization reactions.
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Citation Information

Patent Citations

  • Process for preparing high-purity macroporous silica gel

    CN102079526A

  • Process for polymerizing olefins and polymerization catalyst thereof

    CN1040379A

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    CN1140722A

  • Method for preparing macroporous silicon rubber carrier for ethylene polymerization catalyst by vapour process

    CN1978470A