Oil ammonia column shaping method of spherical aluminium oxide

Abstract

A method for forming a spherical alumina column of oil and ammonia, comprising dropping alumina sol into an oil and ammonia column consisting of an upper oil phase of 0.1 to 4.5 mm and a lower electrolyte solution phase of 10 to 300 cm to form spherical gel particles, Then the gel particles are aged in the electrolyte solution phase for 0.5-10 hours, then dried and calcined. There is no surfactant in the oil phase of this method, and the prepared spherical alumina has less impurity content.

Description

technical field [0001] The invention relates to an oily ammonia column forming method for spherical solid particles, specifically, a method for preparing alumina spherical particles by using the oily ammonia column method. Background technique [0002] The oil ammonia column forming method is a common method for preparing alumina, silicon oxide, silicon aluminum and other pellets. It is to drop the sol into the oil ammonia column, so that the sol particles form balls in the oil phase of the upper layer of the column, and gel in the ammonia water of the lower layer. After aging, the gelled particles are dried and calcined to obtain spherical solid particles. The pellets prepared by this method have uniform structure, low wear and high strength, and are widely used as fixed bed and moving bed catalysts, catalyst carriers, and adsorbents. [0003] USP4179408 discloses a method for preparing spherical alumina. In this method, aluminum sol droplets first enter the upper phase o...

AI Technical Summary

Problems solved by technology

However, the introduction of surfactants can easily cause oil-water emulsification, resulting in turbidity of the ammonia-water phase and oil phase, and changes in the properties of the oil phase.

The effect of using anionic surfactant is good, but the metal cations contained in it are easily absorbed by the sol particles and the gel particles contain impurities