Chambering method for spherical aluminum oxide particles

A spherical alumina and particle technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of limited hole expansion, carbon deposition, and difficulty in uniform dispersion of hole expanding agents, and achieve good hole expansion effect and good dispersion effect. Effect

Active Publication Date: 2015-09-09
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Chambering method for spherical aluminum oxide particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Get 50g pseudo-boehmite, add 100ml water to disperse, obtain pseudo-boehmite suspension; add 10% liquid paraffin in pseudo-boehmite suspension (take the pseudo-boehmite quality as 100%) , 10% Tween80 (100% of pseudo-boehmite quality), homogeneously emulsified to form emulsified suspension. Add 100ml of 1.5% alginate solution to the emulsified suspension and mix well to obtain an alginate-emulsified suspension; drop the alginate-emulsified suspension into 0.2M calcium nitrate to form a wrapped emulsified suspension Liquid alginate particles; washed with water, treated at 70°C and 70% humidity for 4 hours, dried at 70°C to constant weight, and calcined at 550°C for 8 hours to obtain spherical alumina particles. The properties of the pellets are listed in Table 1.

Embodiment 2

[0020] Get 100g pseudo-boehmite, add 200ml water dispersion, obtain pseudo-boehmite suspension; add 20% liquid paraffin (taking pseudo-boehmite quality as 100%) in pseudo-boehmite suspension, 4% P123, homogeneously emulsified to form an emulsified suspension. Add 50ml of 4.0% alginate solution to the emulsified suspension and mix well to obtain an alginate-emulsified suspension; drop the alginate-emulsified suspension into 0.8M calcium nitrate to form a wrapped emulsified suspension Liquid alginate particles; washed with water, treated at 70°C and 70% humidity for 4 hours, dried at 70°C to constant weight, and calcined at 550°C for 8 hours to obtain spherical alumina particles. The properties of the pellets are listed in Table 1.

Embodiment 3

[0022] The surfactant in the preparation process of the emulsified suspension in Example 1 was changed to 8% Tween 80 and 2% Span 80, and the prepared alginate-emulsified suspension was dropped into 0.2M aluminum nitrate to form The alginate granules that wrap the emulsified suspension, the rest are the same as in Example 1. The properties of the pellets are listed in Table 1.

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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...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 于海斌王康孙彦民张业岭李晓云王希涛杨文建孟广莹姜雪丹
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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