Chambering method for spherical aluminum oxide particles

Abstract

The invention discloses a chambering method for spherical aluminum oxide particles. The method comprises the following steps of: dispersing pseudo-boehmite powder by adding water to obtain pseudo-boehmite turbid liquid; adding liquid paraffin, a surfactant and active carbon into the pseudo-boehmite turbid liquid and performing homogenizing emulsification to form emulsified turbid liquid, wherein the mass ratio of the liquid paraffin to the pseudo-boehmite is 0.02-0.2, the mass ratio of the surfactant to the liquid paraffin is 0.2-1, and the mass ratio of the active carbon to the pseudo-boehmite is 0-0.1; adding an adjuvant, in an amount which is 0.1 to 0.5 percent of the mass of the pseudo-boehmite, into the emulsified turbid liquid and performing homogenizing dispersion; after performing homogenizing dispersion, adding soluble alginate aqueous solution at the mass concentration of 1.5 to 4.0% into the emulsified turbid liquid to prepare suspension pulp; dropwise adding the suspension pulp into aqueous solution of aluminum, calcium, barium, copper, zinc, manganese or cobalt metal ion at the concentration of 0.1 to 2.0 mol / L and treating for 10 to 120 min to obtain formed spheres; and drying and roasting to obtain the products. The method provided by the invention has the advantages that dispersibility is high; carbon deposition is low; and the prepared spherical aluminum oxide has high average aperture and specific surface area.

Description

technical field [0001] The invention relates to the field of carrier preparation, in particular to a method for expanding pores of spherical alumina particles. Background technique [0002] As a widely used chemical product, activated alumina has a suitable pore structure and a suitable specific surface area, so it is widely used as a catalyst and catalyst carrier. Since the 1990s, people have done a lot of research on the molding process of spherical alumina. The more mature processes include rolling into balls, extrusion rolling into balls, spray into balls, oil column into balls and oil ammonia column into balls. ball etc. [0003] At present, in the field of chemical industry, especially in petrochemical and biochemical industries, high molecular weight raw materials are more and more widely used, which requires the catalyst or catalyst carrier used to have larger mesopores or macropores. The research of pore expansion, the preparation of alumina with suitable pore str...

AI Technical Summary

Problems solved by technology

In the process of preparing spherical alumina by the conventional rolling ball method and extrusion rolling ball method, the use of activated carbon pore reaming and surfactant pore reaming is limited because the pore expander is not easy to disperse evenly. There are reports on the use of activated carbon and surfactants to expand pores, but the degree of expansion is limited, and there may be carbon deposits caused by incomplete combustion of activated carbon

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