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Preparation method of spherical aluminum oxide

A technology of spherical alumina and alumina, which is applied in the preparation of alumina/hydroxide, preparation of alkali metal aluminate/alumina/aluminum hydroxide, chemical instruments and methods, etc., can solve the problem of increasing process flow and product cost and other problems, to achieve the effect of easy industrial production, simple and controllable process, and low cost

Active Publication Date: 2017-05-31
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above methods all need to prepare the alumina precursor powder first, and then shape the alumina precursor powder after a certain treatment. The process of preparing the alumina precursor powder undoubtedly increases the process flow and the cost of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The concentration of 1000g is 200g Al 2 o 3 / L of sodium metaaluminate solution and 1000g of sodium alginate solution with a concentration of 2% by weight are mixed evenly, and then dripped into the aluminum ion concentration of 0.15mol / L aluminum sulfate solution through a 1.0mm pinhole to form a small gel The balls were soaked and aged for 2 hours; the gel balls were taken out and fully washed until the conductivity of the washing water was less than 500 μs / cm, and then soaked in 1 wt% urea solution for 10 minutes; finally dried at 80°C to a water content of 40 ~65% by weight, dried at 150°C until the water content is less than 10% by weight, and calcined at 550°C for 4 hours to obtain a spherical alumina product. The particle size, strength, pore volume and specific surface area of ​​its products are shown in Table 1.

Embodiment 2

[0022] The concentration of 1000g is 200g Al 2 o 3 / L of sodium metaaluminate solution and 500g of sodium alginate solution with a concentration of 3% by weight are mixed evenly, and then dripped into an aluminum ion concentration of 0.15mol / L aluminum sulfate solution through a 1.0mm pinhole to form a small gel The balls were soaked and aged for 2 hours; the gel balls were taken out and fully washed until the conductivity of the washing water was less than 500 μs / cm, and then soaked in 1 wt% urea solution for 10 minutes; finally dried at 80°C to a water content of 40 ~65% by weight, dried at 150°C until the water content is less than 10% by weight, and calcined at 550°C for 4 hours to obtain a spherical alumina product. The particle size, strength, pore volume and specific surface area of ​​its products are shown in Table 1.

Embodiment 3

[0024] The concentration of 1000g is 200g Al 2 o 3 / L of sodium metaaluminate solution and 1000g of sodium alginate solution with a concentration of 2% by weight are mixed evenly, and then dripped into the aluminum ion concentration of 0.15mol / L aluminum sulfate solution through a 1.0mm pinhole to form a small gel The balls were further soaked and aged for 2 hours; the gel balls were taken out and fully washed until the conductivity of the washing water was less than 500 μs / cm, and then the gel balls were soaked in 2 wt% urea solution for 10 minutes; finally dried at 80°C to a water content of 40 ~65% by weight, dried at 150°C until the water content is less than 10% by weight, and calcined at 550°C for 4 hours to obtain a spherical alumina product. The particle size, strength, pore volume and specific surface area of ​​its products are shown in Table 1.

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Abstract

The invention relates to a preparation method of spherical aluminum oxide. The preparation method comprises the following steps: evenly mixing a sodium metaaluminate solution and an alginate solution, dripping the mixed solution into an aluminum salt solution through a needle hole or spraying the mixed solution into the aluminum salt solution to form gel beads, and further aging until the gel beads are completely hardened; taking out the gel beads, fully washing the gel beads with deionized water until the washing water conductivity is less than 500mu s / cm, and then soaking the gel beads into 0.5-10wt% of a urea solution; finally, drying, and roasting to obtain the spherical aluminum oxide. According to the preparation method, a balling process is coupled with a preparation process of an aluminum oxide precursor, so that the preparing and drying processes of the aluminum oxide precursor (pseudo-boehmite) are omitted; the whole process is simple and controllable and low-cost, and industrial production is easy to realize.

Description

technical field [0001] The invention belongs to the field of inorganic materials and relates to a preparation method of spherical alumina. Background technique [0002] Alumina has become the most widely used catalyst support material because of its special surface properties, pore structure and good stability. At present, the preparation process of alumina carrier materials is usually to prepare the alumina precursor first, and then prepare it into a corresponding shape through a certain molding method. Among them, spherical alumina is widely used in fixed beds and moving beds because of its good rolling properties, low wear, and high strength. [0003] At present, the methods for preparing spherical alumina mainly include the rolling method and the oil (ammonia) column method. Recently, there are also literature and patent reports using the water phase forming method. The rolling method mainly utilizes the water hardness of the quick-release powder to form a cue ball dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14C01F7/30C01F7/32B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01F7/14C01F7/30C01F7/308C01F7/32C01P2004/32C01P2004/64C01P2006/12C01P2006/14
Inventor 孟广莹于海斌孙彦民隋芝宇李晓云王春雷谢献娜李容军赵耀武
Owner CHINA NAT OFFSHORE OIL CORP
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