A kind of preparation method of macroporous silica gel carrier

Abstract

The invention provides a preparation method of a silica gel carrier with a large pore volume, and is used for solving problems of small pore volume and small pore size of existing silica gel carriers. The preparation method of a silica gel carrier with a large pore volume comprises the following steps: uniformly mixing a hydrolysis silicon source, an auxiliary agent and deionized water according to a preset ratio, performing precipitation and filtration to generate a silicon hydrolytic solution to keep in reserve; mixing inorganic acid diluted to a preset concentration with the silicon hydrolytic solution to generate silicic acid sol; adjusting the pH value of the silicic acid sol to generate silicic acid gel; aging the silicic acid gel with water under a preset condition to generate silicic acid gel particles, performing elution and filtration of the silicic acid gel particles to obtain the eluted and filtered silicic acid gel particles; drying and calcining the eluted and filtered silicic acid gel particles under a preset condition to obtain the silica gel carrier with a large pore volume. The silica gel carrier prepared by the preparation method of a silica gel carrier with a large pore volume of the invention has a pore volume of 2.0-3.5 ml / g or more, a bulk specific weight of less than 300 g / L, and a pore size of more than 40 nm.

Description

technical field [0001] The invention relates to the technical fields of biomedicine and catalysis, in particular to a method for preparing a silica gel carrier with large pores. Background technique [0002] Silica gel has a special pore structure, large specific surface area and excellent thermal stability, and is widely used in various industrial fields such as adsorbents, desiccants, thickeners, matting agents, battery electronic materials and catalyst carriers. In recent years, polyethylene materials have become an indispensable part of the national economy and have developed rapidly. The production methods of polyethylene include gas phase method, slurry method and solution method. [0003] At present, in the preparation process of gas-phase polymerization polyethylene catalyst, silica gel has been widely used as a carrier. The catalyst made of this carrier is mainly used in the production of LLDPE (LinearLow-DensityPolyethy-lene, linear low-density polyethylene). Cur...

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Problems solved by technology

[0004] The present invention proposes a method for preparing a silica gel carrier with a large pore volume, which solves the problem that the silica gel carrier has a relatively small pore volume and pore diameter in the prior art

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