Preparation method of micron spherical silicon oxide

Abstract

The invention discloses a preparation method of micron spherical silicon oxide. The method mainly comprises the following steps: pre-mixing silicon oxide powder and colloidal silica solution, adding acid, an additive, a dispersing agent and organic amine, sufficiently mixing the materials to form slurry, injecting the slurry into an oil column for molding through a fluidic generator with a certainaperture, and conducting aging, washing, drying and roasting to obtain the micron spherical silicon oxide particles. The micron spherical silicon oxide particles obtained by the method of the invention have mesoporous characteristics, aperture size controllable within 2-50 nm, specific surface area of 200-450 m<2>/g, pore volume of 0.5-1.5 ml/g, and grain size of 1-500 [mu]m. The micron sphericalsilicon oxide prepared by the method of the invention can be applied to the fields such as heterogeneous catalytic reaction, absorptive separation materials and liquid chromatographic fillers.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of micron spherical silicon oxide. Background technique [0002] Silicon oxide is an attractive research object in the field of nanomaterials and chemical industry in recent years. It is one of the porous solid substances. Silicon oxide has a large specific surface area and uniform pore size, and plays an important role in the field of catalysis and separation, especially in the fields of catalysis, separation and purification, drug embedding and slow release, gas sensing and so on. According to the definition of the International Union of Pure and Applied Chemistry (IUPAC), those with a pore diameter less than 2 nanometers are called micropores; those with a pore diameter larger than 50 nanometers are called macropores; hole). Since the pores have an important influence on the diffusion of substances, the mesoporous silica is of great...

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Problems solved by technology

Patent CN104192853A is to mix tert-butanol and ethylenediamine with water glass, then add sulfuric acid into water glass, a chemical precipitation reaction occurs, and spherical silica is obtained. The main disadvantage is that the particle size distribution is not easy to control and restricts the comparison of molding conditions. Many, and the phenomenon of reunion is serious

Patent CN102249248A is prepared by using tetraethyl orthosilicate as the silicon source, alcohol as the co-solvent, and hydrolysis and condensation under alkaline conditions. The prepared silica particles have micropores, poor density, looseness, and easy pulverization; the patent CN101708854A sprays instant potassium silicate solid particles into inorganic acid through high-pressure gas, controls the injection cycle time to obtain the mixture and then separates the product. It is a combination of microemulsion and spray method in disguise. Although the process is simple, the particle strength of the product obtained is Poor, pore volume and pore diameter are uncontrollable; CN101462727 burns natural gas and oxygen, melts it with a high-temperature flame to form silica, and makes it spheroidize by the surface tension after melting, and then large flow of pure oxygen and natural gas will make the silica The particles are effectively blocked and dispersed, the pore size and pore volume of the obtained particles are uncontrollable, the particle size is uneven, there is agglomeration phenomenon, the operating conditions are harsh, and the energy consumption is high.

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