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Method for preparing spherical aluminum oxide by oil column forming process

A spherical alumina and oil column forming technology, which is applied in chemical instruments and methods, alumina/hydroxide preparation, chemical/physical processes, etc., can solve the problems of easy blockage of the dropper and failure to form smoothly, and achieve the solution of dropper Tube clogging, ensuring smooth effect

Pending Publication Date: 2020-04-24
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, alumina carriers with particle sizes ranging from 1.6 to 2.0 mm are widely used in moving beds, but when using the oil column molding method to prepare spherical alumina with particle sizes less than 2 mm, the dispersing dropper is too fine at this time, resulting in drops during molding. The tube is easily blocked, resulting in the failure of smooth molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 100g of aluminum powder and add it to 1350g of 10% hydrochloric acid aqueous solution by mass fraction, heat and dissolve at 95°C to obtain aluminum sol, add ethanol with 2% mass fraction of aluminum sol, and then add hexamethylenetetramine aqueous solution with a mass fraction of 35% (According to the amount of the N element and the Cl element in the aluminum sol added in a ratio of 1:1), after mixing evenly, drop it into the oil column with a temperature of 90°C through a conventional dispersing dropper. Aged for 6 hours. The gel beads obtained after aging were washed with deionized water until no chloride ions were detected. Then put it into an oven at 110°C and dry it to a constant weight, and finally bake it in a muffle furnace at 900°C for 4 hours to obtain spherical alumina particles.

Embodiment 2

[0017] The preparation method of aluminum sol is the same as that in Example 1. Add aluminum sol quality 5% n-propanol to above-mentioned aluminum sol, add the hexamethylenetetramine aqueous solution that mass fraction is 35% afterwards (according to wherein the amount of the material of N element and Cl element in the aluminum sol 1.1:1 add ), mixed evenly, dripped into the oil column at 95°C through a dispersing dropper, and aged at 140°C and 0.50MPa for 10 hours after molding. The gel beads obtained after aging were washed with deionized water until no chloride ions were detected. Then put it into an oven at 100°C and dry it to a constant weight, and finally bake it in a muffle furnace at 1000°C for 4 hours to obtain spherical alumina particles.

Embodiment 3

[0019] The preparation method of aluminum sol is the same as that in Example 1. Add aluminum sol quality 7.5% isopropanol to above-mentioned aluminum sol, then add the hexamethylenetetramine aqueous solution that mass fraction is 35% (according to wherein the amount of the material of N element and Cl element in the aluminum sol 1:1 adds ), mixed evenly and dripped into an oil column at a temperature of 92°C through a dispersing dropper, and aged at 145°C and 0.60MPa for 8 hours after molding. The gel beads obtained after aging were washed with deionized water until no chloride ions were detected. Then put it into an oven at 105°C and dry it to a constant weight, and finally bake it in a muffle furnace at 800°C for 6 hours to obtain spherical alumina particles.

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Abstract

The invention discloses a method for preparing spherical aluminum oxide by an oil column forming process, and is characterized in that low-carbon alcohol is added into aluminum sol, and the mass of the low-carbon alcohol accounts for 2%-10% of that of the aluminum sol generally. The low-carbon alcohol is one or a mixture of ethanol, propanol, isopropanol, butanol, isobutanol, ethylene glycol, propylene glycol, glycerol, butanediol and the like. The particle size of the spherical aluminum oxide obtained by the method is generally 1.6-2.0 mm, and the spherical aluminum oxide can be used as a catalyst or a carrier to be widely applied to the field of petrochemical engineering or fine chemical engineering.

Description

technical field [0001] The invention relates to a method for preparing spherical alumina by oil column molding, in particular to a method for preparing small-diameter spherical alumina by an oil column molding process. Background technique [0002] Alumina is a chemical with a wide range of uses. It can not only be used as a catalyst itself, but also as a carrier to disperse active substances and improve the anti-sintering ability of active components. At present, the molding methods for preparing millimeter-sized alumina in industry include extrusion molding, rolling ball molding, oil column molding and oil ammonia column molding. Compared with other molding methods, the alumina prepared by the oil column molding method has the advantages of good sphericity, smooth surface and high strength. [0003] When preparing spherical alumina by oil column molding method, a certain amount of chemical general formula is Al 2 (OH) n Cl 6-n The aluminum sol is mixed with gelling age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/42B01J21/04B01J35/02B01J35/08B01J35/00
CPCC01F7/42B01J21/04B01J35/40B01J35/51
Inventor 张哲姚艳敏白立光赵晓东
Owner LIMING RES INST OF CHEM IND
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